Where do these Sungrow fault codes come from?

Compiled from publicly available Sungrow inverter and battery documentation and field references, then rewritten for the trade. Wattbench is independent and not affiliated with Sungrow.

Which of these can I clear on site?

Some clear on their own once grid or environmental conditions return to normal. Anything involving DC isolation, AC switching, wiring or opening the unit is licensed electrical work. Isolate safely, follow AS/NZS 5033 and AS/NZS 3000 procedure and use appropriate PPE before touching a live system.

The exact code isn't listed. Why not?

Firmware and model variants differ, and manufacturers revise their code tables. We document the most common ones; for a variant that isn't here, check the unit's current manual or the manufacturer's service portal.

How current is this reference?

This reference was last reviewed on 2 August 2026. We revise entries when the underlying manufacturer documentation changes.

Inverter Fault Library

Sungrow Alarm Codes

A searchable Sungrow fault reference with current SH5T–SH25T remedies separated from earlier SH/RT/RS, string-inverter, battery and BDC records.

Sources listedReviewed August 2026Source: Manufacturer documentationOur methodology

Manufacturer: Sungrow
Codes documented: 175
Source: Manufacturer documentation
Scope: Reference only

175 of 175 codes

About this fault librarySources · scope

A reference compiled by Wattbench from publicly available Sungrow inverter documentation. Source-linked homeowner and installer remedies are reviewed for the current Australian SH5T–SH25T three-phase hybrid family only. The wider library preserves string-inverter, earlier SH/RT/RS, battery and BDC codes as searchable reference; those entries do not inherit current-T applicability unless a remedy names the current-T manual. Codes that share a single cause and remedy are grouped. Every individual code number is still listed and searchable. Safety note: owners should stop at recording the code, app status and safely visible conditions. DC/AC isolation, electrical measurements, protection settings, wiring and opening equipment are licensed-worker tasks. Any shutdown or restart must follow the exact model and site procedure; this library is not a switching sequence.

Key takeaways

175 Sungrow fault and alarm codes, documented for the trade.
Compiled from published documentation and field references; Wattbench is independent and not affiliated with Sungrow.
Codes involving DC/AC isolation, wiring or opening the unit are licensed electrical work. Isolate safely and follow AS/NZS procedure.

Resolution text is manufacturer/service context, not permission for an owner to perform electrical work. Stop at visible observations unless the exact product instructions identify an owner control. Isolation, configuration, testing, opening equipment and wiring are for an appropriately licensed worker and, where required, an SAA-accredited person. Where a card says Product fit is unknown, treat it as brand-level guidance and confirm the exact model, role, regional variant, firmware and current manual before acting.

002
Grid over-voltage
The grid voltage exceeds the protective value.
Product fit · Confirmed · SH5T–SH25T
Show field stepsHide field steps for 002: Grid over-voltage
Product fit
- SH5T–SH25T · Three-phase hybrid inverter
  Confirmed · Manual Version 17 (2025-04) · AU/region not confirmed · Firmware not documented
Safe checks now
Record the code and time, check only whether the property still has grid supply, and allow the inverter to reconnect automatically. If it repeats, contact the installer; do not change protection settings.
Installer remedy
A licensed installer should verify the measured grid condition and AC connection using the current SH5T–SH25T manual. Preserve the approved country profile and protection limits; escalate a confirmed out-of-range supply to the network service provider rather than widening settings without approval.
Remedy sourceSH5T–SH25T manual
Manufacturer / escalation handoff
003
Transient over-voltage
The grid transient voltage exceeds the inverter's allowable upper limit.
Product fit · Confirmed · SH5T–SH25T
Show field stepsHide field steps for 003: Transient over-voltage
Product fit
- SH5T–SH25T · Three-phase hybrid inverter
  Confirmed · Manual Version 17 (2025-04) · AU/region not confirmed · Firmware not documented
Safe checks now
Record the code and time and allow the inverter to recover automatically. If it repeats, contact the installer; do not change protection settings.
Installer remedy
A licensed installer should verify the measured grid condition and AC connection using the current SH5T–SH25T manual. Preserve the approved country profile and protection limits; escalate a confirmed out-of-range supply to the network service provider rather than widening settings without approval.
Remedy sourceSH5T–SH25T manual
Manufacturer / escalation handoff
004
Grid under-voltage
The grid voltage is below the protective value.
Product fit · Confirmed · SH5T–SH25T
Show field stepsHide field steps for 004: Grid under-voltage
Product fit
- SH5T–SH25T · Three-phase hybrid inverter
  Confirmed · Manual Version 17 (2025-04) · AU/region not confirmed · Firmware not documented
Safe checks now
Record the code and time, check only whether the property still has grid supply, and allow the inverter to reconnect automatically. If it repeats, contact the installer; do not change protection settings.
Installer remedy
A licensed installer should verify the measured grid condition and AC connection using the current SH5T–SH25T manual. Preserve the approved country profile and protection limits; escalate a confirmed out-of-range supply to the network service provider rather than widening settings without approval.
Remedy sourceSH5T–SH25T manual
Manufacturer / escalation handoff
005
Grid under-voltage (lower threshold)
The grid voltage is below the protective value, lower than the threshold for code 004.
Product fit · Confirmed · SH5T–SH25T
Show field stepsHide field steps for 005: Grid under-voltage (lower threshold)
Product fit
- SH5T–SH25T · Three-phase hybrid inverter
  Confirmed · Manual Version 17 (2025-04) · AU/region not confirmed · Firmware not documented
Safe checks now
Record the code and time, check only whether the property still has grid supply, and allow the inverter to reconnect automatically. If it repeats, contact the installer; do not change protection settings.
Installer remedy
A licensed installer should verify the measured grid condition and AC connection using the current SH5T–SH25T manual. Preserve the approved country profile and protection limits; escalate a confirmed out-of-range supply to the network service provider rather than widening settings without approval.
Remedy sourceSH5T–SH25T manual
Manufacturer / escalation handoff
006
AC over-current
The AC output current exceeds the inverter's allowable upper limit.
Show documented next stepHide detail for 006: AC over-current
Documented next step
The inverter resumes once the output current falls below the protection value. If the fault persists, contact Sungrow or your solar installer.
007
Transient AC over-current
A transient AC over-current was detected.
Show documented next stepHide detail for 007: Transient AC over-current
Documented next step
The inverter self-recovers after a few seconds. If the fault persists, contact Sungrow or your solar installer.
008
Grid over-frequency
The grid frequency exceeds the protective value.
Product fit · Confirmed · SH5T–SH25T
Show field stepsHide field steps for 008: Grid over-frequency
Product fit
- SH5T–SH25T · Three-phase hybrid inverter
  Confirmed · Manual Version 17 (2025-04) · AU/region not confirmed · Firmware not documented
Safe checks now
Record the code and time and allow the inverter to reconnect when the grid stabilises. If it repeats, contact the installer; do not change protection settings.
Installer remedy
A licensed installer should verify the measured grid condition and AC connection using the current SH5T–SH25T manual. Preserve the approved country profile and protection limits; escalate a confirmed out-of-range supply to the network service provider rather than widening settings without approval.
Remedy sourceSH5T–SH25T manual
Manufacturer / escalation handoff
009
Grid under-frequency
The grid frequency is below the protective value.
Product fit · Confirmed · SH5T–SH25T
Show field stepsHide field steps for 009: Grid under-frequency
Product fit
- SH5T–SH25T · Three-phase hybrid inverter
  Confirmed · Manual Version 17 (2025-04) · AU/region not confirmed · Firmware not documented
Safe checks now
Record the code and time and allow the inverter to reconnect when the grid stabilises. If it repeats, contact the installer; do not change protection settings.
Installer remedy
A licensed installer should verify the measured grid condition and AC connection using the current SH5T–SH25T manual. Preserve the approved country profile and protection limits; escalate a confirmed out-of-range supply to the network service provider rather than widening settings without approval.
Remedy sourceSH5T–SH25T manual
Manufacturer / escalation handoff
010
Grid failure (islanding)
A grid failure or islanding condition was detected.
Product fit · Confirmed · SH5T–SH25T
Show field stepsHide field steps for 010: Grid failure (islanding)
Product fit
- SH5T–SH25T · Three-phase hybrid inverter
  Confirmed · Manual Version 17 (2025-04) · AU/region not confirmed · Firmware not documented
Safe checks now
Record the code and time and check only whether the property has grid supply. If supply is present and the alarm remains, contact the installer; do not operate switchboard equipment.
Installer remedy
A licensed installer should verify the measured grid condition and AC connection using the current SH5T–SH25T manual. Preserve the approved country profile and protection limits; escalate a confirmed out-of-range supply to the network service provider rather than widening settings without approval.
Remedy sourceSH5T–SH25T manual
Manufacturer / escalation handoff
011
DC injection over-current
The DC current injected into the AC output exceeds the upper limit.
Show documented next stepHide detail for 011: DC injection over-current
Documented next step
Wait a moment for the inverter to recover. If the fault occurs repeatedly, contact Sungrow or your solar installer.
012
Leakage current over-current
The leakage current exceeds the inverter's allowable upper limit.
Product fit · Confirmed · SH5T–SH25T
Show field stepsHide field steps for 012: Leakage current over-current
Product fit
- SH5T–SH25T · Three-phase hybrid inverter
  Confirmed · Manual Version 17 (2025-04) · AU/region not confirmed · Firmware not documented
Safe checks now
Record the code and any safely visible conditions, leave PV wiring and isolators untouched, and contact the installer if the alarm repeats.
Installer remedy
A licensed installer should follow the current SH5T–SH25T manual to test the indicated PV voltage, polarity, insulation or earthing condition under safe isolation. Rectify the cause before returning the inverter to service; do not bypass protection or use repeated resets as a remedy.
Remedy sourceSH5T–SH25T manual
Manufacturer / escalation handoff
013
Grid abnormal
The grid voltage or frequency is outside the permissible range, so the inverter cannot connect to the grid.
Product fit · Confirmed · SH5T–SH25T
Show field stepsHide field steps for 013: Grid abnormal
Product fit
- SH5T–SH25T · Three-phase hybrid inverter
  Confirmed · Manual Version 17 (2025-04) · AU/region not confirmed · Firmware not documented
Safe checks now
Record the code and time and allow the inverter to reconnect when the grid stabilises. If it repeats, contact the installer; do not change protection settings.
Installer remedy
A licensed installer should verify the measured grid condition and AC connection using the current SH5T–SH25T manual. Preserve the approved country profile and protection limits; escalate a confirmed out-of-range supply to the network service provider rather than widening settings without approval.
Remedy sourceSH5T–SH25T manual
Manufacturer / escalation handoff
014
10-minute grid over-voltage
The average grid voltage over 10 minutes exceeds the permissible range.
Product fit · Confirmed · SH5T–SH25T
Show field stepsHide field steps for 014: 10-minute grid over-voltage
Product fit
- SH5T–SH25T · Three-phase hybrid inverter
  Confirmed · Manual Version 17 (2025-04) · AU/region not confirmed · Firmware not documented
Safe checks now
Record the code and time and allow the inverter to reconnect when the grid stabilises. If it repeats, contact the installer; do not change protection settings.
Installer remedy
A licensed installer should verify the measured grid condition and AC connection using the current SH5T–SH25T manual. Preserve the approved country profile and protection limits; escalate a confirmed out-of-range supply to the network service provider rather than widening settings without approval.
Remedy sourceSH5T–SH25T manual
Manufacturer / escalation handoff
015
Grid over-voltage (higher threshold)
The grid voltage exceeds the protective value, higher than the threshold for code 002.
Product fit · Confirmed · SH5T–SH25T
Show field stepsHide field steps for 015: Grid over-voltage (higher threshold)
Product fit
- SH5T–SH25T · Three-phase hybrid inverter
  Confirmed · Manual Version 17 (2025-04) · AU/region not confirmed · Firmware not documented
Safe checks now
Record the code and time and allow the inverter to reconnect when the grid stabilises. If it repeats, contact the installer; do not change protection settings.
Installer remedy
A licensed installer should verify the measured grid condition and AC connection using the current SH5T–SH25T manual. Preserve the approved country profile and protection limits; escalate a confirmed out-of-range supply to the network service provider rather than widening settings without approval.
Remedy sourceSH5T–SH25T manual
Manufacturer / escalation handoff
016
High bus voltage / power
The bus voltage or power is high.
Show documented next stepHide detail for 016: High bus voltage / power
Documented next step
Wait a moment for the inverter to recover. If the fault occurs repeatedly, contact Sungrow or your solar installer.
017
Grid voltage unbalance
Unbalanced three-phase grid voltage was detected.
Product fit · Confirmed · SH5T–SH25T
Show field stepsHide field steps for 017: Grid voltage unbalance
Product fit
- SH5T–SH25T · Three-phase hybrid inverter
  Confirmed · Manual Version 17 (2025-04) · AU/region not confirmed · Firmware not documented
Safe checks now
Record the code and time and allow the inverter to reconnect when the grid stabilises. If it repeats, contact the installer; do not change protection settings.
Installer remedy
A licensed installer should verify the measured grid condition and AC connection using the current SH5T–SH25T manual. Preserve the approved country profile and protection limits; escalate a confirmed out-of-range supply to the network service provider rather than widening settings without approval.
Remedy sourceSH5T–SH25T manual
Manufacturer / escalation handoff
019
Bus transient over-voltage
The transient bus voltage exceeds the inverter's allowable upper limit.
Show documented next stepHide detail for 019: Bus transient over-voltage
Documented next step
Wait a moment for the inverter to recover. If the fault occurs repeatedly, contact Sungrow or your solar installer.
020
Bus over-voltage
The bus voltage exceeds the inverter's allowable upper limit.
Show documented next stepHide detail for 020: Bus over-voltage
Documented next step
Wait a moment for the inverter to recover. If the fault occurs repeatedly, contact Sungrow or your solar installer.
021
PV1 input over-current
The PV1 input over-current limit was exceeded.
Show documented next stepHide detail for 021: PV1 input over-current
Documented next step
Check the PV1 input layout and wiring. Contact your solar installer.
022
PV2 input over-current
The PV2 input over-current limit was exceeded.
Show documented next stepHide detail for 022: PV2 input over-current
Documented next step
Check the PV2 input layout and wiring. Contact your solar installer.
024
Neutral point voltage imbalance
The deviation of the neutral point voltage exceeds the allowable limit.
Show documented next stepHide detail for 024: Neutral point voltage imbalance
Documented next step
The inverter recovers once the deviation falls below the protective limit. Wait a moment for recovery or restart the system. If the fault persists, contact your solar installer.
024–025 · 030–034 · 040–042 · 050 · 060 · 076 · 116–117
Device abnormal
An internal device abnormality was detected. (Sungrow groups these codes under a single remedy.)
Show documented next stepHide detail for 024–025 · 030–034 · 040–042 · 050 · 060 · 076 · 116–117: Device abnormal
Documented next step
Wait for the inverter to recover. Disconnect the AC and DC switches or circuit breakers, then reconnect them after 15 minutes. If the alarm persists, contact Sungrow or your solar installer.
028
PV1 reverse connection
PV1 is connected with reversed polarity.
Product fit · Confirmed · SH5T–SH25T
Show field stepsHide field steps for 028: PV1 reverse connection
Product fit
- SH5T–SH25T · Three-phase hybrid inverter
  Confirmed · Manual Version 17 (2025-04) · AU/region not confirmed · Firmware not documented
Safe checks now
Record the code, leave PV cables and isolators untouched, and contact the installer. Reversed-polarity checks are electrical work.
Installer remedy
A licensed installer should follow the current SH5T–SH25T manual to test the indicated PV voltage, polarity, insulation or earthing condition under safe isolation. Rectify the cause before returning the inverter to service; do not bypass protection or use repeated resets as a remedy.
Remedy sourceSH5T–SH25T manual
Manufacturer / escalation handoff
029
PV2 reverse connection
PV2 is connected with reversed polarity.
Product fit · Confirmed · SH5T–SH25T
Show field stepsHide field steps for 029: PV2 reverse connection
Product fit
- SH5T–SH25T · Three-phase hybrid inverter
  Confirmed · Manual Version 17 (2025-04) · AU/region not confirmed · Firmware not documented
Safe checks now
Record the code, leave PV cables and isolators untouched, and contact the installer. Reversed-polarity checks are electrical work.
Installer remedy
A licensed installer should follow the current SH5T–SH25T manual to test the indicated PV voltage, polarity, insulation or earthing condition under safe isolation. Rectify the cause before returning the inverter to service; do not bypass protection or use repeated resets as a remedy.
Remedy sourceSH5T–SH25T manual
Manufacturer / escalation handoff
036
Radiator over-temperature
The radiator (heat sink) temperature is too high.
Show documented next stepHide detail for 036: Radiator over-temperature
Documented next step
Check the ambient temperature, ensure adequate ventilation space, avoid direct sunlight, verify the fan operates, and clean the air inlets.
037
Internal inverter over-temperature
The internal temperature of the inverter is too high.
Product fit · Confirmed · SH5T–SH25T
Show field stepsHide field steps for 037: Internal inverter over-temperature
Product fit
- SH5T–SH25T · Three-phase hybrid inverter
  Confirmed · Manual Version 17 (2025-04) · AU/region not confirmed · Firmware not documented
Safe checks now
Record the code and check only for safely visible blocked ventilation or direct sun. Do not open or clean inside the inverter; contact the installer if it remains after the unit cools.
Installer remedy
A licensed installer should verify the current SH5T–SH25T clearance, ventilation, ambient-temperature and fan requirements, then correct the indicated cooling condition. Escalate a recurring event in compliant conditions to Sungrow rather than opening or modifying the inverter.
Remedy sourceSH5T–SH25T manual
Manufacturer / escalation handoff
038
Grid-side relay fault
A relay fault on the grid side was detected.
Show documented next stepHide detail for 038: Grid-side relay fault
Documented next step
Wait a moment for the inverter to recover. If the fault occurs repeatedly, contact Sungrow or your solar installer.
039
Low PV-to-earth insulation resistance
The insulation resistance of the PV array to earth is low.
Product fit · Confirmed · SH5T–SH25T
Show field stepsHide field steps for 039: Low PV-to-earth insulation resistance
Product fit
- SH5T–SH25T · Three-phase hybrid inverter
  Confirmed · Manual Version 17 (2025-04) · AU/region not confirmed · Firmware not documented
Safe checks now
Record the code and whether conditions are wet, leave PV wiring and isolators untouched, and contact the installer. Insulation testing is electrical work.
Installer remedy
A licensed installer should follow the current SH5T–SH25T manual to test the indicated PV voltage, polarity, insulation or earthing condition under safe isolation. Rectify the cause before returning the inverter to service; do not bypass protection or use repeated resets as a remedy.
Remedy sourceSH5T–SH25T manual
Manufacturer / escalation handoff
041
Leakage current sampling fault
The leakage-current sampling circuit faulted.
Show documented next stepHide detail for 041: Leakage current sampling fault
Documented next step
Wait a moment for the inverter to recover. If the fault occurs repeatedly, contact Sungrow or your solar installer.
043
Inner under-temperature fault
The ambient temperature inside the inverter is too low.
Show documented next stepHide detail for 043: Inner under-temperature fault
Documented next step
The inverter recovers once the ambient temperature rises above −25 °C.
044
Inverter self-test fault
The inverter self-test failed.
Show documented next stepHide detail for 044: Inverter self-test fault
Documented next step
Wait a moment for the inverter to recover. If the fault occurs repeatedly, contact Sungrow or your solar installer.
045
PV1 boost circuit fault
A fault was detected in the PV1 boost circuit.
Show documented next stepHide detail for 045: PV1 boost circuit fault
Documented next step
Wait a moment for the inverter to recover. If the fault occurs repeatedly, contact Sungrow or your solar installer.
046
PV2 boost circuit fault
A fault was detected in the PV2 boost circuit.
Show documented next stepHide detail for 046: PV2 boost circuit fault
Documented next step
Wait a moment for the inverter to recover. If the fault occurs repeatedly, contact Sungrow or your solar installer.
047
PV inputs error
The PV inputs order is incorrect.
Show documented next stepHide detail for 047: PV inputs error
Documented next step
Stop and disconnect the inverter. Contact your solar installer to reset the PV inputs order.
048
Phase current sampling fault
The phase-current sampling circuit faulted.
Show documented next stepHide detail for 048: Phase current sampling fault
Documented next step
Wait a moment for the inverter to recover. If the fault occurs repeatedly, contact Sungrow or your solar installer.
051
Load over-power (off-grid mode)
The load power exceeds the limit in off-grid mode.
Product fit · Confirmed · SH5T–SH25T
Show field stepsHide field steps for 051: Load over-power (off-grid mode)
Product fit
- SH5T–SH25T · Three-phase hybrid inverter
  Confirmed · Manual Version 17 (2025-04) · AU/region not confirmed · Firmware not documented
Safe checks now
Reduce ordinary non-essential loads on the backed-up circuits. If the alarm remains, contact the installer; do not operate switchboard equipment or inverter isolators.
Installer remedy
A licensed installer should compare the connected backup or controlled load with the current SH5T–SH25T rating and documented control configuration. Correct the load or command path without defeating protection, then escalate a recurring event to Sungrow.
Remedy sourceSH5T–SH25T manual
Manufacturer / escalation handoff
052
INV under-voltage (off-grid mode)
Inverter under-voltage fault in off-grid mode.
Show documented next stepHide detail for 052: INV under-voltage (off-grid mode)
Documented next step
Wait 5 minutes for recovery, or restart the system.
053
Slave DSP grid over-voltage detection
The slave DSP detected that the grid voltage exceeds the inverter's allowable upper limit.
Show documented next stepHide detail for 053: Slave DSP grid over-voltage detection
Documented next step
Check the grid voltage. Contact the utility company if it exceeds the range, otherwise Sungrow or your solar installer.
054
Slave DSP grid over-frequency detection
The slave DSP detected that the grid frequency exceeds the inverter's allowable upper limit.
Show documented next stepHide detail for 054: Slave DSP grid over-frequency detection
Documented next step
Check the grid frequency. Contact the utility company if it exceeds the range, otherwise Sungrow or your solar installer.
056
Slave DSP leakage current detection
The slave DSP detected that the leakage current exceeds the inverter's allowable upper limit.
Show documented next stepHide detail for 056: Slave DSP leakage current detection
Documented next step
Check for PV string ground faults. Contact Sungrow or your solar installer if it repeats.
059
Master–slave DSP communication alarm
A communication alarm between the master and slave DSP.
Show documented next stepHide detail for 059: Master–slave DSP communication alarm
Documented next step
Wait 1 minute for the inverter to recover. If the fault persists, contact Sungrow or your solar installer.
061
No inverter model setting
No inverter model has been set.
Show documented next stepHide detail for 061: No inverter model setting
Documented next step
Contact Sungrow or your solar installer.
062
STB5K backup box DI fault
A DI fault of the STB5K backup box.
Show documented next stepHide detail for 062: STB5K backup box DI fault
Documented next step
Check the DI connection between the inverter and the backup box. Wait 5 minutes for recovery.
063
CPLD version undetectable
The version of the CPLD (complex programmable logic device) cannot be detected.
Show documented next stepHide detail for 063: CPLD version undetectable
Documented next step
Power off the system and program the CPLD.
064
INV over-voltage (off-grid mode)
Inverter over-voltage fault in off-grid mode.
Show documented next stepHide detail for 064: INV over-voltage (off-grid mode)
Documented next step
Wait 5 minutes for recovery, or restart the system.
065
INV under-frequency (off-grid mode)
Inverter under-frequency fault in off-grid mode (default value 47 Hz).
Show documented next stepHide detail for 065: INV under-frequency (off-grid mode)
Documented next step
Wait 5 minutes for recovery, or restart the system.
066
INV over-frequency (off-grid mode)
Inverter over-frequency fault in off-grid mode (default value 52 Hz).
Show documented next stepHide detail for 066: INV over-frequency (off-grid mode)
Documented next step
Wait 5 minutes for recovery, or restart the system.
067
Temporary grid over-voltage (off-grid mode)
A temporary grid over-voltage in off-grid mode.
Show documented next stepHide detail for 067: Temporary grid over-voltage (off-grid mode)
Documented next step
Wait 5 minutes for recovery, or restart the system.
070
Defective fans
The fans are defective (−D series only).
Show documented next stepHide detail for 070: Defective fans
Documented next step
Stop the inverter and disconnect the cables. Check for a blocked fan duct, and replace the fans if necessary.
071
SPD alarm: AC
An AC surge protection device (SPD) alarm.
Show documented next stepHide detail for 071: SPD alarm: AC
Documented next step
Check the SPD and replace it if necessary. Contact Sungrow or your solar installer.
072
SPD alarm: DC
A DC surge protection device (SPD) alarm.
Show documented next stepHide detail for 072: SPD alarm: DC
Documented next step
Check the SPD and replace it if necessary. Contact Sungrow or your solar installer.
075
Parallel inverter RS485 communication error
An RS485 communication error between two inverters in parallel.
Show documented next stepHide detail for 075: Parallel inverter RS485 communication error
Documented next step
Check the RS485 cable connection and the parallel settings in the LCD menu. Contact Sungrow or your solar installer.
078–079
PV string abnormal
A PV string is abnormal.
Show documented next stepHide detail for 078–079: PV string abnormal
Documented next step
Check whether the string needs to be connected, verify a reliable connection, and check the DC fuse status. Contact your installer if it persists.
083
Fan 2 abnormal speed warning
Fan 2 is running at an abnormal speed.
Show documented next stepHide detail for 083: Fan 2 abnormal speed warning
Documented next step
Check whether the fan is blocked. Restart the system.
084
Energy Meter reverse cable connection
The Energy Meter cable connection is reversed.
Show documented next stepHide detail for 084: Energy Meter reverse cable connection
Documented next step
Check the power-cable polarity, verify the “Existing Inverter” setting, and check the CT clamp placement for a single-phase sensor.
085
Mismatched software version
The software versions do not match.
Show documented next stepHide detail for 085: Mismatched software version
Documented next step
Contact Sungrow.
087
AFCI abnormal
The arc-fault detection (AFCI) module is abnormal.
Show documented next stepHide detail for 087: AFCI abnormal
Documented next step
The inverter can operate normally. Check whether the related cable connections and terminals are abnormal, and whether the ambient environment is abnormal; take corrective measures if so. If the alarm persists, contact Sungrow or your solar installer.
088
Arc fault
A DC arc fault was detected.
Show documented next stepHide detail for 088: Arc fault
Documented next step
Disconnect the DC inputs and check the cables for damage, the terminal connections, the fuses, and for burnt modules. Reconnect and clear the alarm via the app. Contact your installer if it persists.
089
AFCI function disabled
The AFCI function is disabled.
Show documented next stepHide detail for 089: AFCI function disabled
Documented next step
Enable the AFCI function via the app and the inverter will recover. If the alarm persists, contact Sungrow or your solar installer.
100
AC output over-current
The AC output current exceeds the upper limit.
Show documented next stepHide detail for 100: AC output over-current
Documented next step
The inverter resumes once the output current falls below the protection value. If the fault persists, contact Sungrow or your solar installer.
101
Grid over-frequency (higher threshold)
The grid frequency exceeds the protective value, higher than the threshold for code 008.
Show documented next stepHide detail for 101: Grid over-frequency (higher threshold)
Documented next step
Check the grid frequency. Contact the utility company if it exceeds the range, otherwise Sungrow or your solar installer.
102
Grid under-frequency (lower threshold)
The grid frequency is below the protective value, lower than the threshold for code 009.
Show documented next stepHide detail for 102: Grid under-frequency (lower threshold)
Documented next step
Check the grid frequency. Contact the utility company if it exceeds the range, otherwise Sungrow or your solar installer.
105
SPI auto-test fault (Italy only)
The SPI auto-test failed (Italy only).
Show documented next stepHide detail for 105: SPI auto-test fault (Italy only)
Documented next step
Restart the system and re-run the auto-test if necessary. If the fault persists, contact Sungrow for a solution.
106
Abnormal grounding
Neither the PE terminal on the AC connection block nor the second PE terminal on the enclosure is reliably connected.
Product fit · Confirmed · SH5T–SH25T
Show field stepsHide field steps for 106: Abnormal grounding
Product fit
- SH5T–SH25T · Three-phase hybrid inverter
  Confirmed · Manual Version 17 (2025-04) · AU/region not confirmed · Firmware not documented
Safe checks now
Record the code, leave earthing conductors and equipment untouched, and contact the installer.
Installer remedy
A licensed installer should follow the current SH5T–SH25T manual to test the indicated PV voltage, polarity, insulation or earthing condition under safe isolation. Rectify the cause before returning the inverter to service; do not bypass protection or use repeated resets as a remedy.
Remedy sourceSH5T–SH25T manual
Manufacturer / escalation handoff
107
DC injection over-voltage (off-grid mode)
The DC injection of the inverter voltage exceeds the upper limit, in off-grid mode.
Show documented next stepHide detail for 107: DC injection over-voltage (off-grid mode)
Documented next step
The inverter recovers once the DC injection voltage falls below the recovery value.
113
Temporary bypass over-current
A temporary over-current on the bypass path.
Show documented next stepHide detail for 113: Temporary bypass over-current
Documented next step
Check the BACKUP-port load power against the upper limit. Wait for recovery or restart. Contact Sungrow if it persists.
200
Bus hardware over-voltage
The bus voltage exceeds the hardware protective value.
Show documented next stepHide detail for 200: Bus hardware over-voltage
Documented next step
Wait for the inverter to recover once the bus voltage drops. If the fault occurs repeatedly, contact Sungrow or your solar installer.
201
Bus voltage too low
The bus voltage is too low.
Show documented next stepHide detail for 201: Bus voltage too low
Documented next step
Wait a moment for the inverter to recover. If the fault occurs repeatedly, contact Sungrow or your solar installer.
202
PV hardware over-current
The PV1 or PV2 current exceeds the hardware protective value.
Show documented next stepHide detail for 202: PV hardware over-current
Documented next step
Contact Sungrow or your solar installer if it repeats.
203
PV input voltage exceeds bus voltage
The PV input voltage exceeds the bus voltage.
Show documented next stepHide detail for 203: PV input voltage exceeds bus voltage
Documented next step
Check the PV connection terminal functionality. Contact your solar installer.
204
PV1 boost short-circuit fault
A short-circuit fault in the PV1 boost stage.
Show documented next stepHide detail for 204: PV1 boost short-circuit fault
Documented next step
The inverter may be damaged. Contact Sungrow for a solution.
205
PV2 boost short-circuit fault
A short-circuit fault in the PV2 boost stage.
Show documented next stepHide detail for 205: PV2 boost short-circuit fault
Documented next step
The inverter may be damaged. Contact Sungrow for a solution.
300
INV over-temperature
Inverter over-temperature fault.
Show documented next stepHide detail for 300: INV over-temperature
Documented next step
Check and clean the heat sink, verify the inverter is not in direct sunlight and the ambient temperature is below 45–60 °C, then restart.
302
PV insulation resistance fault
Low PV insulation resistance.
Show documented next stepHide detail for 302: PV insulation resistance fault
Documented next step
Check the PV cable connection integrity. Wait for a sunny day to test. Contact your installer if it persists.
303
Bypass relay fault
A fault in the bypass relay.
Show documented next stepHide detail for 303: Bypass relay fault
Documented next step
Wait 5 minutes for the inverter to recover, or restart the system. If the error persists, contact Sungrow or your solar installer.
304
Off-grid relay fault
A fault in the off-grid relay.
Show documented next stepHide detail for 304: Off-grid relay fault
Documented next step
Wait 5 minutes for the inverter to recover, or restart the system. If the error persists, contact Sungrow or your solar installer.
306
Input and output power mismatch
The input and output power do not match.
Show documented next stepHide detail for 306: Input and output power mismatch
Documented next step
Contact Sungrow or your solar installer if it repeats.
308
Slave DSP redundant fault
A redundancy fault on the slave DSP.
Show documented next stepHide detail for 308: Slave DSP redundant fault
Documented next step
Restart the system. Contact Sungrow or your solar installer if it persists.
309
Phase voltage sampling fault
The phase-voltage sampling circuit faulted.
Show documented next stepHide detail for 309: Phase voltage sampling fault
Documented next step
Restart the system. Contact Sungrow or your solar installer if it persists.
312
DC injection sampling fault
The DC-injection sampling circuit faulted.
Show documented next stepHide detail for 312: DC injection sampling fault
Documented next step
Restart the system. Contact Sungrow or your solar installer if it persists.
315
PV1 current sampling fault
The PV1 current-sampling channel is anomalous.
Show documented next stepHide detail for 315: PV1 current sampling fault
Documented next step
Contact Sungrow or your solar installer.
316
PV2 current sampling fault
The PV2 current-sampling channel is anomalous.
Show documented next stepHide detail for 316: PV2 current sampling fault
Documented next step
Contact Sungrow or your solar installer.
317
PV1 MPPT current sampling fault
The PV1 MPPT current-sampling circuit faulted.
Show documented next stepHide detail for 317: PV1 MPPT current sampling fault
Documented next step
Restart the system. Contact Sungrow or your solar installer if it persists.
318
PV2 MPPT current sampling fault
The PV2 MPPT current-sampling circuit faulted.
Show documented next stepHide detail for 318: PV2 MPPT current sampling fault
Documented next step
Restart the system. Contact Sungrow or your solar installer if it persists.
319
System power supply failure
A failure of the system power supply.
Show documented next stepHide detail for 319: System power supply failure
Documented next step
Restart the system. Contact Sungrow or your solar installer if it persists.
320
Leakage current sensor fault
A fault in the leakage-current sensor.
Show documented next stepHide detail for 320: Leakage current sensor fault
Documented next step
Contact Sungrow or your solar installer.
321
SPI communication failure
Communication faults between the master DSP and the slave DSP.
Show documented next stepHide detail for 321: SPI communication failure
Documented next step
Restart the system. Contact Sungrow or your solar installer if it persists.
322
Master DSP communication fault
A communication fault on the master DSP.
Show documented next stepHide detail for 322: Master DSP communication fault
Documented next step
Restart the system. Contact Sungrow or your solar installer if it persists.
401–408
Permanent faults
A permanent fault was recorded. (Sungrow groups these codes under a single remedy.)
Show documented next stepHide detail for 401–408: Permanent faults
Documented next step
Restart the system. Contact Sungrow or your solar installer if it persists.
409
All temperature sensors fail
All temperature sensors have failed.
Show documented next stepHide detail for 409: All temperature sensors fail
Documented next step
Contact Sungrow or your solar installer if it repeats.
501
FRAM1 reading warning
An external-memory read/write warning (FRAM1).
Show documented next stepHide detail for 501: FRAM1 reading warning
Documented next step
The inverter can still connect to the grid. Restart the system. If the fault persists, contact Sungrow or your solar installer.
503
Ambient temp sensor open-circuit
Ambient temperature sensor open-circuit warning.
Product fit · Confirmed · SH5T–SH25T
Show field stepsHide field steps for 503: Ambient temp sensor open-circuit
Product fit
- SH5T–SH25T · Three-phase hybrid inverter
  Confirmed · Manual Version 17 (2025-04) · AU/region not confirmed · Firmware not documented
Safe checks now
Record the code and safely visible ambient conditions. Do not open the inverter; contact the installer if it repeats.
Installer remedy
A licensed installer should verify the current SH5T–SH25T clearance, ventilation, ambient-temperature and fan requirements, then correct the indicated cooling condition. Escalate a recurring event in compliant conditions to Sungrow rather than opening or modifying the inverter.
Remedy sourceSH5T–SH25T manual
Manufacturer / escalation handoff
504
Ambient temp sensor short-circuit
Ambient temperature sensor short-circuit warning.
Product fit · Confirmed · SH5T–SH25T
Show field stepsHide field steps for 504: Ambient temp sensor short-circuit
Product fit
- SH5T–SH25T · Three-phase hybrid inverter
  Confirmed · Manual Version 17 (2025-04) · AU/region not confirmed · Firmware not documented
Safe checks now
Record the code and safely visible ambient conditions. Do not open the inverter; contact the installer if it repeats.
Installer remedy
A licensed installer should verify the current SH5T–SH25T clearance, ventilation, ambient-temperature and fan requirements, then correct the indicated cooling condition. Escalate a recurring event in compliant conditions to Sungrow rather than opening or modifying the inverter.
Remedy sourceSH5T–SH25T manual
Manufacturer / escalation handoff
505
Radiator temp sensor open-circuit
Radiator temperature sensor open-circuit warning.
Show documented next stepHide detail for 505: Radiator temp sensor open-circuit
Documented next step
Contact Sungrow or your solar installer if it repeats.
506
Radiator temp sensor short-circuit
Radiator temperature sensor short-circuit warning.
Show documented next stepHide detail for 506: Radiator temp sensor short-circuit
Documented next step
Contact Sungrow or your solar installer if it repeats.
507
DO power settings error
An error in the DO (digital output) power settings.
Product fit · Confirmed · SH5T–SH25T
Show field stepsHide field steps for 507: DO power settings error
Product fit
- SH5T–SH25T · Three-phase hybrid inverter
  Confirmed · Manual Version 17 (2025-04) · AU/region not confirmed · Firmware not documented
Safe checks now
Record the code and the affected ordinary load. Do not change control settings; contact the installer.
Installer remedy
A licensed installer should compare the connected backup or controlled load with the current SH5T–SH25T rating and documented control configuration. Correct the load or command path without defeating protection, then escalate a recurring event to Sungrow.
Remedy sourceSH5T–SH25T manual
Manufacturer / escalation handoff
509
Clock reset fault
The clock has been reset.
Show documented next stepHide detail for 509: Clock reset fault
Documented next step
Manually reset the clock, or synchronise with network time, to clear the fault.
510
PV over-voltage fault
The PV voltage exceeds the permissible range.
Product fit · Confirmed · SH5T–SH25T
Show field stepsHide field steps for 510: PV over-voltage fault
Product fit
- SH5T–SH25T · Three-phase hybrid inverter
  Confirmed · Manual Version 17 (2025-04) · AU/region not confirmed · Firmware not documented
Safe checks now
Record the code, leave PV wiring and isolators untouched, and contact the installer. Array-voltage checks are electrical work.
Installer remedy
A licensed installer should follow the current SH5T–SH25T manual to test the indicated PV voltage, polarity, insulation or earthing condition under safe isolation. Rectify the cause before returning the inverter to service; do not bypass protection or use repeated resets as a remedy.
Remedy sourceSH5T–SH25T manual
Manufacturer / escalation handoff
511
Ambient temp sensor open-circuit
Ambient temperature sensor open-circuit warning.
Show documented next stepHide detail for 511: Ambient temp sensor open-circuit
Documented next step
Contact Sungrow or your solar installer if it repeats.
513
Fan 1 abnormal speed warning
Fan 1 is running at an abnormal speed.
Product fit · Confirmed · SH5T–SH25T
Show field stepsHide field steps for 513: Fan 1 abnormal speed warning
Product fit
- SH5T–SH25T · Three-phase hybrid inverter
  Confirmed · Manual Version 17 (2025-04) · AU/region not confirmed · Firmware not documented
Safe checks now
Record the code and check only for safely visible blocked ventilation. Do not open the inverter or handle its fan; contact the installer if it repeats.
Installer remedy
A licensed installer should verify the current SH5T–SH25T clearance, ventilation, ambient-temperature and fan requirements, then correct the indicated cooling condition. Escalate a recurring event in compliant conditions to Sungrow rather than opening or modifying the inverter.
Remedy sourceSH5T–SH25T manual
Manufacturer / escalation handoff
514
Energy Meter communication warning
Abnormal Energy Meter communication (the inverter can still connect to the grid).
Product fit · Confirmed · SH5T–SH25T
Show field stepsHide field steps for 514: Energy Meter communication warning
Product fit
- SH5T–SH25T · Three-phase hybrid inverter
  Confirmed · Manual Version 17 (2025-04) · AU/region not confirmed · Firmware not documented
Safe checks now
Record the code and note whether monitoring data is missing. Do not access the meter or switchboard; contact the installer if it persists.
Installer remedy
A licensed installer should verify the meter model, power supply, polarity and RS485 wiring against the current SH5T–SH25T commissioning instructions. Preserve settings as found and correct the communication path before considering component replacement.
Remedy sourceSH5T–SH25T manual
Manufacturer / escalation handoff
532–535
String reverse connection
A PV string is connected with reversed polarity.
Show documented next stepHide detail for 532–535: String reverse connection
Documented next step
Check the string polarity; adjust only when solar radiation is low and the string current is below 0.5 A. Contact Sungrow if it persists.
548–551
Abnormal PV string current
A PV string current is abnormal.
Show documented next stepHide detail for 548–551: Abnormal PV string current
Documented next step
Check for shaded PV modules; remove shade and clean them. Check for abnormal module aging. Contact Sungrow if it persists.
622
Leakage current sampling fault
The leakage-current sampling circuit faulted.
Show documented next stepHide detail for 622: Leakage current sampling fault
Documented next step
Wait a moment for the inverter to recover. If the fault occurs repeatedly, contact Sungrow or your solar installer.
600
Temporary BDC charging over-current
A temporary over-current during battery (BDC) charging.
Show documented next stepHide detail for 600: Temporary BDC charging over-current
Documented next step
Wait for the system to recover, or restart.
601
Temporary BDC discharging over-current
A temporary over-current during battery (BDC) discharging.
Show documented next stepHide detail for 601: Temporary BDC discharging over-current
Documented next step
Wait for the system to recover, or restart.
602
Clamping capacitor under-voltage
The clamping-capacitor voltage is too low.
Show documented next stepHide detail for 602: Clamping capacitor under-voltage
Documented next step
Check the battery cable connection. Wait for recovery or restart.
603
Temporary clamping capacitor over-voltage
A temporary clamping-capacitor over-voltage.
Show documented next stepHide detail for 603: Temporary clamping capacitor over-voltage
Documented next step
Wait for the system to recover, or restart.
608
BDC circuit self-check fault
The battery (BDC) circuit self-check failed.
Show documented next stepHide detail for 608: BDC circuit self-check fault
Documented next step
Wait for the system to recover, or restart.
612
BDC over-temperature
The battery (BDC) stage is over temperature.
Show documented next stepHide detail for 612: BDC over-temperature
Documented next step
Check and clean the heat sink, verify the location is not in sunlight and the ambient temperature is below 45 °C, then restart.
616
BDC hardware over-current
The battery (BDC) hardware over-current limit was exceeded.
Show documented next stepHide detail for 616: BDC hardware over-current
Documented next step
The system resumes once the battery charge/discharge current falls below the upper limit, or restart the system.
620
BDC current sampling fault
The battery (BDC) current-sampling circuit faulted.
Show documented next stepHide detail for 620: BDC current sampling fault
Documented next step
Wait for the system to recover, or restart.
623
Slave DSP communication fault
A slave DSP communication fault.
Show documented next stepHide detail for 623: Slave DSP communication fault
Documented next step
Wait for the system to recover, or restart.
624
BDC soft-start fault
The battery (BDC) soft-start failed.
Show documented next stepHide detail for 624: BDC soft-start fault
Documented next step
Wait for the system to recover, or restart.
703
Battery average under-voltage
The average battery voltage is too low.
Product fit · Confirmed · SH5T–SH25T
Show field stepsHide field steps for 703: Battery average under-voltage
Product fit
- SH5T–SH25T · Three-phase hybrid inverter
  Confirmed · Manual Version 17 (2025-04) · AU/region not confirmed · Firmware not documented
Safe checks now
Record the code and battery indicators and allow the system to recover. Do not operate battery cabling or switches; contact the installer if it persists.
Installer remedy
A licensed installer should use the current SH5T–SH25T manual and the exact battery documentation to verify the indicated battery state, temperature, voltage, cable or communication condition. Use only the documented recovery path and escalate persistent protection events without bypassing the BMS.
Remedy sourceSH5T–SH25T manual
Manufacturer / escalation handoff
707
Battery over-temperature
The battery is over temperature.
Show documented next stepHide detail for 707: Battery over-temperature
Documented next step
The inverter stays grid-connected but charge/discharge has stopped. Check the battery's ambient temperature. Wait for recovery or restart.
708
Battery under-temperature
The battery is under temperature.
Show documented next stepHide detail for 708: Battery under-temperature
Documented next step
The inverter stays grid-connected but charge/discharge has stopped. Check the battery's ambient temperature. Wait for recovery or restart.
711
Instantaneous battery over-voltage
An instantaneous battery over-voltage.
Product fit · Confirmed · SH5T–SH25T
Show field stepsHide field steps for 711: Instantaneous battery over-voltage
Product fit
- SH5T–SH25T · Three-phase hybrid inverter
  Confirmed · Manual Version 17 (2025-04) · AU/region not confirmed · Firmware not documented
Safe checks now
Record the code and battery indicators and allow the system to recover. Do not operate battery cabling or switches; contact the installer if it persists.
Installer remedy
A licensed installer should use the current SH5T–SH25T manual and the exact battery documentation to verify the indicated battery state, temperature, voltage, cable or communication condition. Use only the documented recovery path and escalate persistent protection events without bypassing the BMS.
Remedy sourceSH5T–SH25T manual
Manufacturer / escalation handoff
712
Battery average over-voltage
The average battery voltage is too high.
Product fit · Confirmed · SH5T–SH25T
Show field stepsHide field steps for 712: Battery average over-voltage
Product fit
- SH5T–SH25T · Three-phase hybrid inverter
  Confirmed · Manual Version 17 (2025-04) · AU/region not confirmed · Firmware not documented
Safe checks now
Record the code and battery indicators and allow the system to recover. Do not operate battery cabling or switches; contact the installer if it persists.
Installer remedy
A licensed installer should use the current SH5T–SH25T manual and the exact battery documentation to verify the indicated battery state, temperature, voltage, cable or communication condition. Use only the documented recovery path and escalate persistent protection events without bypassing the BMS.
Remedy sourceSH5T–SH25T manual
Manufacturer / escalation handoff
714
Abnormal battery–inverter communication
Abnormal communication between the battery and the hybrid inverter.
Product fit · Confirmed · SH5T–SH25T
Show field stepsHide field steps for 714: Abnormal battery–inverter communication
Product fit
- SH5T–SH25T · Three-phase hybrid inverter
  Confirmed · Manual Version 17 (2025-04) · AU/region not confirmed · Firmware not documented
Safe checks now
Record the inverter and battery indicators. Do not reconnect communication cables or operate battery switches; contact the installer if the alarm remains.
Installer remedy
A licensed installer should use the current SH5T–SH25T manual and the exact battery documentation to verify the indicated battery state, temperature, voltage, cable or communication condition. Use only the documented recovery path and escalate persistent protection events without bypassing the BMS.
Remedy sourceSH5T–SH25T manual
Manufacturer / escalation handoff
715
Battery hardware over-voltage
The battery hardware over-voltage limit was exceeded.
Product fit · Confirmed · SH5T–SH25T
Show field stepsHide field steps for 715: Battery hardware over-voltage
Product fit
- SH5T–SH25T · Three-phase hybrid inverter
  Confirmed · Manual Version 17 (2025-04) · AU/region not confirmed · Firmware not documented
Safe checks now
Record the code and battery indicators and allow the system to recover. Do not operate battery cabling or switches; contact the installer if it persists.
Installer remedy
A licensed installer should use the current SH5T–SH25T manual and the exact battery documentation to verify the indicated battery state, temperature, voltage, cable or communication condition. Use only the documented recovery path and escalate persistent protection events without bypassing the BMS.
Remedy sourceSH5T–SH25T manual
Manufacturer / escalation handoff
732
Battery over-voltage protection
Battery over-voltage protection has triggered.
Product fit · Confirmed · SH5T–SH25T
Show field stepsHide field steps for 732: Battery over-voltage protection
Product fit
- SH5T–SH25T · Three-phase hybrid inverter
  Confirmed · Manual Version 17 (2025-04) · AU/region not confirmed · Firmware not documented
Safe checks now
Record the code and battery indicators and allow the system to recover. Do not operate battery cabling or switches; contact the installer if it persists.
Installer remedy
A licensed installer should use the current SH5T–SH25T manual and the exact battery documentation to verify the indicated battery state, temperature, voltage, cable or communication condition. Use only the documented recovery path and escalate persistent protection events without bypassing the BMS.
Remedy sourceSH5T–SH25T manual
Manufacturer / escalation handoff
733
Battery over-temperature protection
Battery over-temperature protection has triggered.
Product fit · Confirmed · SH5T–SH25T
Show field stepsHide field steps for 733: Battery over-temperature protection
Product fit
- SH5T–SH25T · Three-phase hybrid inverter
  Confirmed · Manual Version 17 (2025-04) · AU/region not confirmed · Firmware not documented
Safe checks now
Record the code and safely visible ambient conditions and allow the battery to cool. Do not operate battery cabling or switches; contact the installer if it persists.
Installer remedy
A licensed installer should use the current SH5T–SH25T manual and the exact battery documentation to verify the indicated battery state, temperature, voltage, cable or communication condition. Use only the documented recovery path and escalate persistent protection events without bypassing the BMS.
Remedy sourceSH5T–SH25T manual
Manufacturer / escalation handoff
734
Battery under-temperature protection
Battery under-temperature protection has triggered.
Product fit · Confirmed · SH5T–SH25T
Show field stepsHide field steps for 734: Battery under-temperature protection
Product fit
- SH5T–SH25T · Three-phase hybrid inverter
  Confirmed · Manual Version 17 (2025-04) · AU/region not confirmed · Firmware not documented
Safe checks now
Record the code and safely visible ambient conditions and allow the battery to warm within its installed environment. Do not operate battery cabling or switches; contact the installer if it persists.
Installer remedy
A licensed installer should use the current SH5T–SH25T manual and the exact battery documentation to verify the indicated battery state, temperature, voltage, cable or communication condition. Use only the documented recovery path and escalate persistent protection events without bypassing the BMS.
Remedy sourceSH5T–SH25T manual
Manufacturer / escalation handoff
735
Battery charge/discharge over-current protection
Battery charging/discharging over-current protection has triggered.
Product fit · Confirmed · SH5T–SH25T
Show field stepsHide field steps for 735: Battery charge/discharge over-current protection
Product fit
- SH5T–SH25T · Three-phase hybrid inverter
  Confirmed · Manual Version 17 (2025-04) · AU/region not confirmed · Firmware not documented
Safe checks now
Record the code and battery indicators and allow the system to recover. Do not operate battery cabling or switches; contact the installer if it persists.
Installer remedy
A licensed installer should use the current SH5T–SH25T manual and the exact battery documentation to verify the indicated battery state, temperature, voltage, cable or communication condition. Use only the documented recovery path and escalate persistent protection events without bypassing the BMS.
Remedy sourceSH5T–SH25T manual
Manufacturer / escalation handoff
739
Battery under-voltage protection
Battery under-voltage protection has triggered.
Product fit · Confirmed · SH5T–SH25T
Show field stepsHide field steps for 739: Battery under-voltage protection
Product fit
- SH5T–SH25T · Three-phase hybrid inverter
  Confirmed · Manual Version 17 (2025-04) · AU/region not confirmed · Firmware not documented
Safe checks now
Record the code and battery indicators and allow the system to recover. Do not operate battery cabling or switches; contact the installer if it persists.
Installer remedy
A licensed installer should use the current SH5T–SH25T manual and the exact battery documentation to verify the indicated battery state, temperature, voltage, cable or communication condition. Use only the documented recovery path and escalate persistent protection events without bypassing the BMS.
Remedy sourceSH5T–SH25T manual
Manufacturer / escalation handoff
800 · 802 · 804 · 807
BDC internal permanent fault
An internal permanent fault in the battery (BDC) stage. (Sungrow groups these codes under a single remedy.)
Show documented next stepHide detail for 800 · 802 · 804 · 807: BDC internal permanent fault
Documented next step
Restart the system. Contact Sungrow if it persists.
832
Battery FET fault
A battery FET fault or electrical switch failure.
Product fit · Confirmed · SH5T–SH25T
Show field stepsHide field steps for 832: Battery FET fault
Product fit
- SH5T–SH25T · Three-phase hybrid inverter
  Confirmed · Manual Version 17 (2025-04) · AU/region not confirmed · Firmware not documented
Safe checks now
Record the code and battery indicators. Do not force a restart or operate battery cabling or switches; contact the installer.
Installer remedy
A licensed installer should use the current SH5T–SH25T manual and the exact battery documentation to verify the indicated battery state, temperature, voltage, cable or communication condition. Use only the documented recovery path and escalate persistent protection events without bypassing the BMS.
Remedy sourceSH5T–SH25T manual
Manufacturer / escalation handoff
834
Battery over-current permanent fault
A battery charging/discharging over-current permanent fault.
Show documented next stepHide detail for 834: Battery over-current permanent fault
Documented next step
The inverter stays grid-connected but charge/discharge has stopped. Check the battery port voltage and cable connection. Force-shutdown and restart the system.
836
ID competing failure
An ID-competing failure.
Show documented next stepHide detail for 836: ID competing failure
Documented next step
Restart the system. Contact Sungrow if it persists.
839
Mismatched software version
The software versions do not match.
Show documented next stepHide detail for 839: Mismatched software version
Documented next step
Contact Sungrow for a solution.
844
Software self-verifying failure
The software self-verification failed.
Show documented next stepHide detail for 844: Software self-verifying failure
Documented next step
Restart the system. Contact Sungrow if it persists.
864
Battery cell over-voltage
A battery cell over-voltage fault.
Show documented next stepHide detail for 864: Battery cell over-voltage
Documented next step
The inverter can still connect to the grid but charge/discharge has stopped. Wait a moment for recovery or restart the system.
866
Battery pre-charge voltage fault
A battery pre-charge voltage fault.
Show documented next stepHide detail for 866: Battery pre-charge voltage fault
Documented next step
The inverter stays grid-connected but charge/discharge has stopped. Check the battery port voltage and cable connection. Force-shutdown and restart the system.
867
Battery under-voltage fault
A battery under-voltage fault.
Show documented next stepHide detail for 867: Battery under-voltage fault
Documented next step
The inverter stays grid-connected but charge/discharge has stopped. Check the battery port voltage and cable connection. Force-shutdown and restart the system.
868
Battery cell voltage imbalance
A battery cell voltage imbalance fault.
Show documented next stepHide detail for 868: Battery cell voltage imbalance
Documented next step
The inverter stays grid-connected but charge/discharge has stopped. Check the battery port voltage and cable connection. Force-shutdown and restart the system.
870
Battery cable connection fault
A battery cable connection fault.
Show documented next stepHide detail for 870: Battery cable connection fault
Documented next step
The inverter stays grid-connected but charge/discharge has stopped. Check the battery port voltage and cable connection. Force-shutdown and restart the system.
900 · 901
BDC temperature sensor warning
A battery (BDC) temperature-sensor warning. (Sungrow groups these codes under a single remedy.)
Show documented next stepHide detail for 900 · 901: BDC temperature sensor warning
Documented next step
Check and clean the heat sink, verify the location is not in sunlight and the ambient temperature is below 45 °C, then restart.
906
Transformer direction recognition error
The transformer direction was recognised incorrectly.
Show documented next stepHide detail for 906: Transformer direction recognition error
Documented next step
The inverter can still connect to the grid but charge/discharge has stopped. Wait a moment for recovery or restart the system.
909
Low SOH (State of Health) warning
The battery's State of Health is low.
Show documented next stepHide detail for 909: Low SOH (State of Health) warning
Documented next step
The inverter stays grid-connected and charge/discharge is normal. The battery is beyond the scope of the warranty. It is recommended to contact the distributor for replacement.
910
FRAM2 warning
A FRAM2 memory warning.
Show documented next stepHide detail for 910: FRAM2 warning
Documented next step
Restart the inverter.
932
Battery over-voltage warning
A battery over-voltage warning.
Product fit · Confirmed · SH5T–SH25T
Show field stepsHide field steps for 932: Battery over-voltage warning
Product fit
- SH5T–SH25T · Three-phase hybrid inverter
  Confirmed · Manual Version 17 (2025-04) · AU/region not confirmed · Firmware not documented
Safe checks now
Record the code and battery indicators and allow the system to recover. Do not operate battery cabling or switches; contact the installer if it persists.
Installer remedy
A licensed installer should use the current SH5T–SH25T manual and the exact battery documentation to verify the indicated battery state, temperature, voltage, cable or communication condition. Use only the documented recovery path and escalate persistent protection events without bypassing the BMS.
Remedy sourceSH5T–SH25T manual
Manufacturer / escalation handoff
933
Battery over-temperature warning
A battery over-temperature warning.
Product fit · Confirmed · SH5T–SH25T
Show field stepsHide field steps for 933: Battery over-temperature warning
Product fit
- SH5T–SH25T · Three-phase hybrid inverter
  Confirmed · Manual Version 17 (2025-04) · AU/region not confirmed · Firmware not documented
Safe checks now
Record the code and safely visible ambient conditions and allow the battery to cool. Do not operate battery cabling or switches; contact the installer if it persists.
Installer remedy
A licensed installer should use the current SH5T–SH25T manual and the exact battery documentation to verify the indicated battery state, temperature, voltage, cable or communication condition. Use only the documented recovery path and escalate persistent protection events without bypassing the BMS.
Remedy sourceSH5T–SH25T manual
Manufacturer / escalation handoff
934
Battery under-temperature warning
A battery under-temperature warning.
Product fit · Confirmed · SH5T–SH25T
Show field stepsHide field steps for 934: Battery under-temperature warning
Product fit
- SH5T–SH25T · Three-phase hybrid inverter
  Confirmed · Manual Version 17 (2025-04) · AU/region not confirmed · Firmware not documented
Safe checks now
Record the code and safely visible ambient conditions and allow the battery to warm within its installed environment. Do not operate battery cabling or switches; contact the installer if it persists.
Installer remedy
A licensed installer should use the current SH5T–SH25T manual and the exact battery documentation to verify the indicated battery state, temperature, voltage, cable or communication condition. Use only the documented recovery path and escalate persistent protection events without bypassing the BMS.
Remedy sourceSH5T–SH25T manual
Manufacturer / escalation handoff
935
Battery charge/discharge over-current warning
A battery charging/discharging over-current warning.
Product fit · Confirmed · SH5T–SH25T
Show field stepsHide field steps for 935: Battery charge/discharge over-current warning
Product fit
- SH5T–SH25T · Three-phase hybrid inverter
  Confirmed · Manual Version 17 (2025-04) · AU/region not confirmed · Firmware not documented
Safe checks now
Record the code and battery indicators and allow the system to recover. Do not operate battery cabling or switches; contact the installer if it persists.
Installer remedy
A licensed installer should use the current SH5T–SH25T manual and the exact battery documentation to verify the indicated battery state, temperature, voltage, cable or communication condition. Use only the documented recovery path and escalate persistent protection events without bypassing the BMS.
Remedy sourceSH5T–SH25T manual
Manufacturer / escalation handoff
937
Battery tray voltage imbalance warning
A battery tray voltage imbalance warning.
Product fit · Confirmed · SH5T–SH25T
Show field stepsHide field steps for 937: Battery tray voltage imbalance warning
Product fit
- SH5T–SH25T · Three-phase hybrid inverter
  Confirmed · Manual Version 17 (2025-04) · AU/region not confirmed · Firmware not documented
Safe checks now
Record the code and battery indicators. Do not inspect or reconnect battery cables; contact the installer if the warning remains.
Installer remedy
A licensed installer should use the current SH5T–SH25T manual and the exact battery documentation to verify the indicated battery state, temperature, voltage, cable or communication condition. Use only the documented recovery path and escalate persistent protection events without bypassing the BMS.
Remedy sourceSH5T–SH25T manual
Manufacturer / escalation handoff
939
Battery under-voltage warning
A battery under-voltage warning.
Product fit · Confirmed · SH5T–SH25T
Show field stepsHide field steps for 939: Battery under-voltage warning
Product fit
- SH5T–SH25T · Three-phase hybrid inverter
  Confirmed · Manual Version 17 (2025-04) · AU/region not confirmed · Firmware not documented
Safe checks now
Record the code and battery indicators and allow the system to recover. Do not operate battery cabling or switches; contact the installer if it persists.
Installer remedy
A licensed installer should use the current SH5T–SH25T manual and the exact battery documentation to verify the indicated battery state, temperature, voltage, cable or communication condition. Use only the documented recovery path and escalate persistent protection events without bypassing the BMS.
Remedy sourceSH5T–SH25T manual
Manufacturer / escalation handoff
964
Battery internal warning
An internal battery warning.
Show documented next stepHide detail for 964: Battery internal warning
Documented next step
Consult the battery manufacturer for a solution.
001 (SH)
Grid over-voltage
SH hybrid series: grid over-voltage.
Show documented next stepHide detail for 001 (SH): Grid over-voltage
Documented next step
The inverter reconnects after the grid recovers. If frequent, measure the grid voltage and contact the utility company or Sungrow. Verify the protection parameters and AC cable cross-section.
002 (SH)
Grid under-voltage
SH hybrid series: grid under-voltage.
Show documented next stepHide detail for 002 (SH): Grid under-voltage
Documented next step
Generally reconnects after the grid recovers. If frequent, measure the grid voltage and contact the utility company. Verify the protection parameters and AC cable connections.
003 (SH)
Grid over-frequency
SH hybrid series: grid over-frequency.
Show documented next stepHide detail for 003 (SH): Grid over-frequency
Documented next step
Generally reconnects after recovery. If frequent, measure the grid frequency and contact the utility company. Verify the protection parameters.
004 (SH)
Grid under-frequency
SH hybrid series: grid under-frequency.
Show documented next stepHide detail for 004 (SH): Grid under-frequency
Documented next step
Generally reconnects after recovery. If frequent, measure the grid frequency and contact the utility company. Verify the protection parameters.
005 (SH)
No grid
SH hybrid series: no grid detected.
Show documented next stepHide detail for 005 (SH): No grid
Documented next step
Check the grid power supply reliability, AC cable connections, live/neutral wire placement, and AC switch status. Contact Sungrow or your solar installer if it persists.
006 (SH)
Over-high leakage current
SH hybrid series: leakage current too high.
Show documented next stepHide detail for 006 (SH): Over-high leakage current
Documented next step
Can be caused by poor sunlight or a damp environment. The inverter reconnects after conditions improve. If the environment is normal, check that the AC and DC cables are well insulated. If the alarm persists, contact Sungrow or your solar installer.
007 (SH)
Grid abnormal
SH hybrid series: grid abnormal.
Show documented next stepHide detail for 007 (SH): Grid abnormal
Documented next step
Generally reconnects after recovery. If frequent, measure the grid frequency and contact the utility company. Contact Sungrow or your solar installer if it persists.
008 (SH)
Grid voltage unbalance
SH hybrid series: unbalanced grid voltage.
Show documented next stepHide detail for 008 (SH): Grid voltage unbalance
Documented next step
Generally reconnects after recovery. If frequent, measure the grid voltage; if unbalanced, contact the utility company. Modify the settings via the app if within the permissible range.
009 (SH)
PV reverse connection fault
SH hybrid series: PV reverse connection fault.
Show documented next stepHide detail for 009 (SH): PV reverse connection fault
Documented next step
Check the string polarity; adjust only when solar radiation is low and string current is below 0.5 A. Verify that strings on the same MPPT have the same module count. Contact Sungrow if it persists.
010 (SH)
PV reverse connection alarm
SH hybrid series: PV reverse connection alarm.
Show documented next stepHide detail for 010 (SH): PV reverse connection alarm
Documented next step
Check the string polarity; adjust only when solar radiation is low and string current is below 0.5 A. Verify that strings on the same MPPT have the same module count. Contact Sungrow if it persists.
011 (SH)
PV abnormal alarm
SH hybrid series: PV abnormal alarm.
Show documented next stepHide detail for 011 (SH): PV abnormal alarm
Documented next step
Check for shaded PV modules; remove shade and clean them. Check for abnormal module aging. Contact Sungrow or your solar installer if it persists.
012 (SH)
High ambient temperature
SH hybrid series: high ambient temperature.
Show documented next stepHide detail for 012 (SH): High ambient temperature
Documented next step
Avoid direct sunlight; clean the air ducts; check for a fan alarm via the app and replace the fan if needed. Contact Sungrow or your solar installer if it persists.
013 (SH)
Low ambient temperature
SH hybrid series: low ambient temperature.
Show documented next stepHide detail for 013 (SH): Low ambient temperature
Documented next step
Stop and disconnect the inverter. Restart it when the ambient temperature is within the permissible range.
014 (SH)
Low ISO resistance
SH hybrid series: low insulation (ISO) resistance.
Show documented next stepHide detail for 014 (SH): Low ISO resistance
Documented next step
Wait for recovery. Verify the protection value via the app complies with regulations. Check the PV cable insulation. Clear any water/vegetation on site. Contact Sungrow if it persists.
015 (SH)
Grounding cable fault
SH hybrid series: grounding cable fault.
Show documented next stepHide detail for 015 (SH): Grounding cable fault
Documented next step
Check the AC cable connections. Verify the grounding-cable wire-core insulation. Contact Sungrow or your solar installer if it persists.
016 (SH)
Arc fault
SH hybrid series: DC arc fault.
Show documented next stepHide detail for 016 (SH): Arc fault
Documented next step
Disconnect the DC inputs and check the cables for damage, terminal connections, fuses, and burnt modules. Reconnect and clear via the app. Contact your installer if it persists.
017 (SH)
Off-grid load over-power
SH hybrid series: off-grid load over-power.
Show documented next stepHide detail for 017 (SH): Off-grid load over-power
Documented next step
Reduce the power of loads connected at the off-grid port, or remove some loads. If the alarm persists, contact Sungrow or your solar installer.
018 (SH)
Reverse Smart Energy Meter connection
SH hybrid series: Smart Energy Meter connected in reverse.
Show documented next stepHide detail for 018 (SH): Reverse Smart Energy Meter connection
Documented next step
Check the meter polarity against the cable-port markings and correct it if needed. Verify the meter is connected at the grid connection point. Contact Sungrow or your solar installer if it persists.
019 (SH)
Smart Energy Meter communication error
SH hybrid series: Smart Energy Meter communication error.
Show documented next stepHide detail for 019 (SH): Smart Energy Meter communication error
Documented next step
Check the meter communication cable and terminals for abnormality, and reconnect the communication cable. Contact Sungrow or your solar installer if it persists.
020 (SH)
Grid confrontation
SH hybrid series: grid confrontation.
Show documented next stepHide detail for 020 (SH): Grid confrontation
Documented next step
Check whether the AC output port is connected to the actual grid; if so, disconnect it. If the alarm persists, contact Sungrow or your solar installer.
021 (SH)
Parallel communication alarm
SH hybrid series: parallel communication alarm.
Show documented next stepHide detail for 021 (SH): Parallel communication alarm
Documented next step
Check the communication cable and terminal connections for abnormality, and reinstall the communication cable. Contact Sungrow or your solar installer if it persists.
022 (SH)
BMS communication error
SH hybrid series: battery management system (BMS) communication error.
Show documented next stepHide detail for 022 (SH): BMS communication error
Documented next step
Check the communication cable and terminal connections for abnormality, and reinstall the communication cable. Contact Sungrow or your solar installer if it persists.
023 (SH)
Battery polarity reversed
SH hybrid series: battery polarity reversed.
Show documented next stepHide detail for 023 (SH): Battery polarity reversed
Documented next step
Check the battery polarity is correct and correct it if necessary. If the alarm persists, contact Sungrow or your solar installer.
024 (SH)
Battery alarm
SH hybrid series: battery alarm.
Show documented next stepHide detail for 024 (SH): Battery alarm
Documented next step
The battery generally recovers automatically. If persistent, address ambient-temperature issues or contact the battery manufacturer.
025 (SH)
Battery abnormal
SH hybrid series: battery abnormal.
Show documented next stepHide detail for 025 (SH): Battery abnormal
Documented next step
If the voltage is abnormal, check the battery's real-time voltage and contact the manufacturer or Sungrow. For temperature issues, improve heat dissipation. Contact the manufacturer if it persists.
063 (SH)
System alarm
SH hybrid series: system alarm.
Show documented next stepHide detail for 063 (SH): System alarm
Documented next step
The inverter can operate normally. Check whether the related cable connections and terminals are abnormal, and whether the ambient environment is abnormal; take corrective measures if so. If the alarm persists, contact Sungrow or your solar installer.
064 (SH)
System fault
SH hybrid series: system fault.
Show documented next stepHide detail for 064 (SH): System fault
Documented next step
Wait for the inverter to recover. Disconnect the AC and DC switches or circuit breakers, then reconnect them after 15 minutes. If the alarm persists, contact Sungrow or your solar installer.

Sources

ManufacturerSungrow SH5.0/6.0/8.0/10RT user manual, version 19
ManufacturerSungrow SH3.0–6.0RS and SH5.0–6.0RS-20 user manual, version 21
ManufacturerSungrow SBH100–400 high-voltage battery user manual, version 15
ManufacturerSungrow SH5T/6T/8T/10T/12T/15T/20T/25T three-phase hybrid inverter user manual, version 17 (2025-04)
ManufacturerSungrow Australia: SH5T/10T hybrid inverter

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Frequently asked

Where do these Sungrow fault codes come from?: Compiled from publicly available Sungrow inverter and battery documentation and field references, then rewritten for the trade. Wattbench is independent and not affiliated with Sungrow.
Which of these can I clear on site?: Some clear on their own once grid or environmental conditions return to normal. Anything involving DC isolation, AC switching, wiring or opening the unit is licensed electrical work. Isolate safely, follow AS/NZS 5033 and AS/NZS 3000 procedure and use appropriate PPE before touching a live system.
The exact code isn't listed. Why not?: Firmware and model variants differ, and manufacturers revise their code tables. We document the most common ones; for a variant that isn't here, check the unit's current manual or the manufacturer's service portal.
How current is this reference?: This reference was last reviewed on 2 August 2026. We revise entries when the underlying manufacturer documentation changes.

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