Huawei Inverter Error Codes
Huawei SUN2000 alarm reference with audience-separated, source-linked remedies for current M2 and M3 families; broader residential and backup codes remain explicitly unverified for those families.
35 of 35 codes
About this fault librarySources · scope
A reference compiled by Wattbench from publicly available Huawei inverter documentation. Source-linked homeowner and installer remedies are reviewed against the Australian SUN2000-(8KTL–20KTL)-M2 and SUN2000-(20KTL–40KTL)-M3 manuals. The remaining residential, battery, backup and scheduling codes stay searchable as broader SUN2000 reference without inheriting M2/M3 applicability. Safety note: anything involving DC isolators, AC switches, wiring, electrical measurements or opening the unit is licensed-electrician work. If in doubt, record the alarm and contact your installer.
- 35 Huawei (SUN2000 series) fault and alarm codes, documented for the trade.
- Compiled from published documentation and field references; Wattbench is independent and not affiliated with Huawei (SUN2000 series).
- 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.
- 2001
High string input voltage
Open-circuit voltage exceeds the maximum input voltage.
Product fit · Confirmed · 2 documented families
Show field stepsHide field steps for 2001: High string input voltage
Product fit
SUN2000-(8KTL–20KTL)-M2 · Three-phase string inverter
Confirmed · Manual Issue 06 · AU/region not confirmed · Firmware not documented
SUN2000-(20KTL–40KTL)-M3 · Three-phase string inverter
Confirmed · Manual Issue 02 · AU/region not confirmed · Firmware not documented
Safe checks now
Record the alarm and cause ID if shown, leave PV, AC and earthing wiring and isolators untouched, and contact the installer. Electrical measurements and recovery work require a licensed worker.
Installer remedy
A licensed installer should check the number of PV modules connected in series in the PV string, and ensure the string open-circuit voltage is no greater than the maximum operating voltage. Once the PV array is correctly configured, the alarm clears automatically.
Remedy sourceSUN2000 M2 manualSUN2000 M3 manual
Manufacturer / escalation handoff
- 2002
DC arc fault
The PV string power cable arcs or is in poor contact. Cause ID 1 = PV1, Cause ID 2 = PV2.
Product fit · Confirmed · 2 documented families
Show field stepsHide field steps for 2002: DC arc fault
Product fit
SUN2000-(8KTL–20KTL)-M2 · Three-phase string inverter
Confirmed · Manual Issue 06 · AU/region not confirmed · Firmware not documented
SUN2000-(20KTL–40KTL)-M3 · Three-phase string inverter
Confirmed · Manual Issue 02 · AU/region not confirmed · Firmware not documented
Safe checks now
Record the alarm and cause ID if shown, leave PV, AC and earthing wiring and isolators untouched, and contact the installer. Electrical measurements and recovery work require a licensed worker.
Installer remedy
A licensed installer should check whether the string cables arc or are in poor contact.
Remedy sourceSUN2000 M2 manualSUN2000 M3 manual
Manufacturer / escalation handoff
- 2003
DC arc fault
The PV string power cable arcs or is in poor contact. Cause ID 1 = PV1, Cause ID 2 = PV2.
Product fit · Confirmed · SUN2000-(20KTL–40KTL)-M3
Show field stepsHide field steps for 2003: DC arc fault
Product fit
SUN2000-(20KTL–40KTL)-M3 · Three-phase string inverter
Confirmed · Manual Issue 02 · AU/region not confirmed · Firmware not documented
Safe checks now
Record the alarm and cause ID if shown, leave PV, AC and earthing wiring and isolators untouched, and contact the installer. Electrical measurements and recovery work require a licensed worker.
Installer remedy
A licensed installer should check whether the string cables arc or are in poor contact.
Remedy sourceSUN2000 M3 manual
Manufacturer / escalation handoff
- 2011
String reversed
The PV string is reverse-connected. Cause ID 1 = PV1, Cause ID 2 = PV2.
Product fit · Confirmed · 2 documented families
Show field stepsHide field steps for 2011: String reversed
Product fit
SUN2000-(8KTL–20KTL)-M2 · Three-phase string inverter
Confirmed · Manual Issue 06 · AU/region not confirmed · Firmware not documented
SUN2000-(20KTL–40KTL)-M3 · Three-phase string inverter
Confirmed · Manual Issue 02 · AU/region not confirmed · Firmware not documented
Safe checks now
Record the alarm and cause ID if shown, leave PV, AC and earthing wiring and isolators untouched, and contact the installer. Electrical measurements and recovery work require a licensed worker.
Installer remedy
A licensed installer should check whether the PV string is reverse-connected to the inverter.
Remedy sourceSUN2000 M2 manualSUN2000 M3 manual
Manufacturer / escalation handoff
- 2012
String current back-feed
Only a few PV modules are connected in series in the string, so its end voltage is lower than the other strings. Cause ID 1 = PV1, Cause ID 2 = PV2.
Product fit · Confirmed · 2 documented families
Show field stepsHide field steps for 2012: String current back-feed
Product fit
SUN2000-(8KTL–20KTL)-M2 · Three-phase string inverter
Confirmed · Manual Issue 06 · AU/region not confirmed · Firmware not documented
SUN2000-(20KTL–40KTL)-M3 · Three-phase string inverter
Confirmed · Manual Issue 02 · AU/region not confirmed · Firmware not documented
Safe checks now
Record the alarm and cause ID if shown, leave PV, AC and earthing wiring and isolators untouched, and contact the installer. Electrical measurements and recovery work require a licensed worker.
Installer remedy
A licensed installer should compare the module count with parallel strings, check for shading, and verify the string open-circuit voltage. Any reconfiguration must follow the exact model procedure and only occur after the circuit is made safe.
Remedy sourceSUN2000 M2 manualSUN2000 M3 manual
Manufacturer / escalation handoff
- 2021
AFCI check failure
The AFCI self-check fails. Either the AFCI check circuit is abnormal, or the AFCI circuit is faulty.
Product fit · Confirmed · 2 documented families
Show field stepsHide field steps for 2021: AFCI check failure
Product fit
SUN2000-(8KTL–20KTL)-M2 · Three-phase string inverter
Confirmed · Manual Issue 06 · AU/region not confirmed · Firmware not documented
SUN2000-(20KTL–40KTL)-M3 · Three-phase string inverter
Confirmed · Manual Issue 02 · AU/region not confirmed · Firmware not documented
Safe checks now
Record the alarm and cause ID if shown, leave PV, AC and earthing wiring and isolators untouched, and contact the installer. Electrical measurements and recovery work require a licensed worker.
Installer remedy
A licensed installer should follow the exact M2 or M3 manual's controlled diagnostic and recovery procedure for this alarm. Do not substitute a generic switching sequence; if the alarm persists after the documented check, preserve the event evidence and escalate to Huawei support.
Remedy sourceSUN2000 M2 manualSUN2000 M3 manual
Manufacturer / escalation handoff
- 2031
Phase wire short-circuit to PE
The impedance of the output phase wire is low, or it is short-circuited to PE.
Product fit · Confirmed · 2 documented families
Show field stepsHide field steps for 2031: Phase wire short-circuit to PE
Product fit
SUN2000-(8KTL–20KTL)-M2 · Three-phase string inverter
Confirmed · Manual Issue 06 · AU/region not confirmed · Firmware not documented
SUN2000-(20KTL–40KTL)-M3 · Three-phase string inverter
Confirmed · Manual Issue 02 · AU/region not confirmed · Firmware not documented
Safe checks now
Record the alarm and cause ID if shown, leave PV, AC and earthing wiring and isolators untouched, and contact the installer. Electrical measurements and recovery work require a licensed worker.
Installer remedy
A licensed installer should check the impedance of the output phase wire to PE, locate the position with low impedance, and restore it.
Remedy sourceSUN2000 M2 manualSUN2000 M3 manual
Manufacturer / escalation handoff
- 2032
Grid failure
The grid is experiencing an outage, the AC circuit is disconnected, or the AC switch is off.
Product fit · Confirmed · 2 documented families
Show field stepsHide field steps for 2032: Grid failure
Product fit
SUN2000-(8KTL–20KTL)-M2 · Three-phase string inverter
Confirmed · Manual Issue 06 · AU/region not confirmed · Firmware not documented
SUN2000-(20KTL–40KTL)-M3 · Three-phase string inverter
Confirmed · Manual Issue 02 · AU/region not confirmed · Firmware not documented
Safe checks now
Record the alarm, cause ID if shown, and time; check only whether the property has grid supply and allow the inverter to recover. If it repeats, contact the installer; do not change protected grid settings.
Installer remedy
Check whether grid supply is available and record the switch states without operating them. If supply is present, a licensed installer should verify the AC cable and switch connection.
Remedy sourceSUN2000 M2 manualSUN2000 M3 manual
Manufacturer / escalation handoff
- 2033
Grid under-voltage
The grid voltage is below the lower threshold, or the under-voltage duration exceeds the value specified by LVRT.
Product fit · Confirmed · 2 documented families
Show field stepsHide field steps for 2033: Grid under-voltage
Product fit
SUN2000-(8KTL–20KTL)-M2 · Three-phase string inverter
Confirmed · Manual Issue 06 · AU/region not confirmed · Firmware not documented
SUN2000-(20KTL–40KTL)-M3 · Three-phase string inverter
Confirmed · Manual Issue 02 · AU/region not confirmed · Firmware not documented
Safe checks now
Record the alarm, cause ID if shown, and time; check only whether the property has grid supply and allow the inverter to recover. If it repeats, contact the installer; do not change protected grid settings.
Installer remedy
The inverter normally recovers when the grid returns to range. If repeated, the installer should verify the measured voltage and AC connection; contact the network operator if supply is out of range. Change protection settings only with network approval.
Remedy sourceSUN2000 M2 manualSUN2000 M3 manual
Manufacturer / escalation handoff
- 2034
Grid over-voltage
The grid voltage is above the upper threshold, or the over-voltage duration exceeds the value specified by HVRT.
Product fit · Confirmed · 2 documented families
Show field stepsHide field steps for 2034: Grid over-voltage
Product fit
SUN2000-(8KTL–20KTL)-M2 · Three-phase string inverter
Confirmed · Manual Issue 06 · AU/region not confirmed · Firmware not documented
SUN2000-(20KTL–40KTL)-M3 · Three-phase string inverter
Confirmed · Manual Issue 02 · AU/region not confirmed · Firmware not documented
Safe checks now
Record the alarm, cause ID if shown, and time; check only whether the property has grid supply and allow the inverter to recover. If it repeats, contact the installer; do not change protected grid settings.
Installer remedy
The inverter normally recovers when the grid returns to range. If repeated, the installer should verify the voltage at the grid connection point and contact the network operator if it is out of range. Change protection settings only with network approval.
Remedy sourceSUN2000 M2 manualSUN2000 M3 manual
Manufacturer / escalation handoff
- 2035
Unbalanced grid voltage
The difference between grid phase voltages exceeds the upper threshold.
Product fit · Confirmed · 2 documented families
Show field stepsHide field steps for 2035: Unbalanced grid voltage
Product fit
SUN2000-(8KTL–20KTL)-M2 · Three-phase string inverter
Confirmed · Manual Issue 06 · AU/region not confirmed · Firmware not documented
SUN2000-(20KTL–40KTL)-M3 · Three-phase string inverter
Confirmed · Manual Issue 02 · AU/region not confirmed · Firmware not documented
Safe checks now
Record the alarm, cause ID if shown, and time; check only whether the property has grid supply and allow the inverter to recover. If it repeats, contact the installer; do not change protected grid settings.
Installer remedy
The inverter normally recovers when the grid returns to range. If repeated, a licensed installer should verify the phase voltages and AC output cables, then escalate an out-of-range supply to the network operator.
Remedy sourceSUN2000 M2 manualSUN2000 M3 manual
Manufacturer / escalation handoff
- 2036
Grid over-frequency
Grid exception: the actual grid frequency is higher than the local grid standard allows.
Product fit · Confirmed · 2 documented families
Show field stepsHide field steps for 2036: Grid over-frequency
Product fit
SUN2000-(8KTL–20KTL)-M2 · Three-phase string inverter
Confirmed · Manual Issue 06 · AU/region not confirmed · Firmware not documented
SUN2000-(20KTL–40KTL)-M3 · Three-phase string inverter
Confirmed · Manual Issue 02 · AU/region not confirmed · Firmware not documented
Safe checks now
Record the alarm, cause ID if shown, and time; check only whether the property has grid supply and allow the inverter to recover. If it repeats, contact the installer; do not change protected grid settings.
Installer remedy
The inverter normally recovers when frequency returns to range. If repeated, verify the event data and contact the network operator if supply is out of range. Change protection settings only with network approval.
Remedy sourceSUN2000 M2 manualSUN2000 M3 manual
Manufacturer / escalation handoff
- 2037
Grid under-frequency
Grid exception: the actual grid frequency is lower than the local grid standard requires.
Product fit · Confirmed · 2 documented families
Show field stepsHide field steps for 2037: Grid under-frequency
Product fit
SUN2000-(8KTL–20KTL)-M2 · Three-phase string inverter
Confirmed · Manual Issue 06 · AU/region not confirmed · Firmware not documented
SUN2000-(20KTL–40KTL)-M3 · Three-phase string inverter
Confirmed · Manual Issue 02 · AU/region not confirmed · Firmware not documented
Safe checks now
Record the alarm, cause ID if shown, and time; check only whether the property has grid supply and allow the inverter to recover. If it repeats, contact the installer; do not change protected grid settings.
Installer remedy
The inverter normally recovers when frequency returns to range. If repeated, verify the event data and contact the network operator if supply is out of range. Change protection settings only with network approval.
Remedy sourceSUN2000 M2 manualSUN2000 M3 manual
Manufacturer / escalation handoff
- 2038
Unstable grid frequency
Grid exception: the rate of change of grid frequency does not comply with the local grid standard.
Product fit · Confirmed · 2 documented families
Show field stepsHide field steps for 2038: Unstable grid frequency
Product fit
SUN2000-(8KTL–20KTL)-M2 · Three-phase string inverter
Confirmed · Manual Issue 06 · AU/region not confirmed · Firmware not documented
SUN2000-(20KTL–40KTL)-M3 · Three-phase string inverter
Confirmed · Manual Issue 02 · AU/region not confirmed · Firmware not documented
Safe checks now
Record the alarm, cause ID if shown, and time; check only whether the property has grid supply and allow the inverter to recover. If it repeats, contact the installer; do not change protected grid settings.
Installer remedy
The inverter normally recovers when the grid stabilises. If the event repeats, have the installer verify the frequency data and contact the network operator if it is outside range.
Remedy sourceSUN2000 M2 manualSUN2000 M3 manual
Manufacturer / escalation handoff
- 2039
Output over-current
The grid voltage drops dramatically or the grid is short-circuited, so the inverter's transient output current exceeds the upper threshold and protection is triggered.
Product fit · Confirmed · 2 documented families
Show field stepsHide field steps for 2039: Output over-current
Product fit
SUN2000-(8KTL–20KTL)-M2 · Three-phase string inverter
Confirmed · Manual Issue 06 · AU/region not confirmed · Firmware not documented
SUN2000-(20KTL–40KTL)-M3 · Three-phase string inverter
Confirmed · Manual Issue 02 · AU/region not confirmed · Firmware not documented
Safe checks now
Record the alarm, cause ID if shown, and time; check only whether the property has grid supply and allow the inverter to recover. If it repeats, contact the installer; do not change protected grid settings.
Installer remedy
The inverter monitors for recovery automatically. If the event repeats or affects production, a licensed installer should check the AC output for a short circuit and contact Huawei support if unresolved.
Remedy sourceSUN2000 M2 manualSUN2000 M3 manual
Manufacturer / escalation handoff
- 2040
Output DC component over-high
The DC component of the inverter output current exceeds the specified upper threshold.
Product fit · Confirmed · 2 documented families
Show field stepsHide field steps for 2040: Output DC component over-high
Product fit
SUN2000-(8KTL–20KTL)-M2 · Three-phase string inverter
Confirmed · Manual Issue 06 · AU/region not confirmed · Firmware not documented
SUN2000-(20KTL–40KTL)-M3 · Three-phase string inverter
Confirmed · Manual Issue 02 · AU/region not confirmed · Firmware not documented
Safe checks now
Record the alarm, cause ID if shown, and time; check only whether the property has grid supply and allow the inverter to recover. If it repeats, contact the installer; do not change protected grid settings.
Installer remedy
The inverter monitors for recovery automatically. If the event repeats, contact the installer, dealer or Huawei technical support.
Remedy sourceSUN2000 M2 manualSUN2000 M3 manual
Manufacturer / escalation handoff
- 2051
Abnormal residual current
The insulation impedance of the input side to PE decreases while the inverter is operating.
Product fit · Confirmed · 2 documented families
Show field stepsHide field steps for 2051: Abnormal residual current
Product fit
SUN2000-(8KTL–20KTL)-M2 · Three-phase string inverter
Confirmed · Manual Issue 06 · AU/region not confirmed · Firmware not documented
SUN2000-(20KTL–40KTL)-M3 · Three-phase string inverter
Confirmed · Manual Issue 02 · AU/region not confirmed · Firmware not documented
Safe checks now
Record the alarm and cause ID if shown, leave PV, AC and earthing wiring and isolators untouched, and contact the installer. Electrical measurements and recovery work require a licensed worker.
Installer remedy
A transient event may clear automatically. If it repeats or persists, a licensed installer should test the impedance between each PV string and earth and rectify any insulation fault.
Remedy sourceSUN2000 M2 manualSUN2000 M3 manual
Manufacturer / escalation handoff
- 2061
Abnormal grounding
The N cable or ground cable is not connected. When a PV array is grounded, the inverter output is not connected to an isolation transformer.
Product fit · Confirmed · 2 documented families
Show field stepsHide field steps for 2061: Abnormal grounding
Product fit
SUN2000-(8KTL–20KTL)-M2 · Three-phase string inverter
Confirmed · Manual Issue 06 · AU/region not confirmed · Firmware not documented
SUN2000-(20KTL–40KTL)-M3 · Three-phase string inverter
Confirmed · Manual Issue 02 · AU/region not confirmed · Firmware not documented
Safe checks now
Record the alarm and cause ID if shown, leave PV, AC and earthing wiring and isolators untouched, and contact the installer. Electrical measurements and recovery work require a licensed worker.
Installer remedy
A licensed installer should power off the inverter using the exact model procedure, verify the PE and neutral connections, and confirm any isolation-transformer configuration before changing the grounding-inspection setting.
Remedy sourceSUN2000 M2 manualSUN2000 M3 manual
Manufacturer / escalation handoff
- 2062
Low insulation resistance
The PV array is short-circuited to PE, or the array's environment is damp and insulation between the array and ground is poor.
Product fit · Confirmed · 2 documented families
Show field stepsHide field steps for 2062: Low insulation resistance
Product fit
SUN2000-(8KTL–20KTL)-M2 · Three-phase string inverter
Confirmed · Manual Issue 06 · AU/region not confirmed · Firmware not documented
SUN2000-(20KTL–40KTL)-M3 · Three-phase string inverter
Confirmed · Manual Issue 02 · AU/region not confirmed · Firmware not documented
Safe checks now
Record the alarm and cause ID if shown, leave PV, AC and earthing wiring and isolators untouched, and contact the installer. Electrical measurements and recovery work require a licensed worker.
Installer remedy
A licensed installer should test the impedance between the PV array and PE, locate any short circuit or insulation defect, and verify the inverter PE connection. Do not lower the protection threshold without confirming the exact model requirements and site conditions.
Remedy sourceSUN2000 M2 manualSUN2000 M3 manual
Manufacturer / escalation handoff
- 2063
Over-temperature
The inverter is installed in a poorly ventilated location, or the ambient temperature is too high.
Product fit · Confirmed · 2 documented families
Show field stepsHide field steps for 2063: Over-temperature
Product fit
SUN2000-(8KTL–20KTL)-M2 · Three-phase string inverter
Confirmed · Manual Issue 06 · AU/region not confirmed · Firmware not documented
SUN2000-(20KTL–40KTL)-M3 · Three-phase string inverter
Confirmed · Manual Issue 02 · AU/region not confirmed · Firmware not documented
Safe checks now
Record the alarm and check only for safely visible blocked ventilation or direct sun. Do not open the inverter; contact the installer if the alarm remains after the unit cools.
Installer remedy
Check the ventilation and ambient temperature at the install location. If ventilation is poor or the ambient temperature is above the upper threshold, improve airflow and heat dissipation. If both meet requirements, contact your dealer or Huawei technical support.
Remedy sourceSUN2000 M2 manualSUN2000 M3 manual
Manufacturer / escalation handoff
- 2064
Device fault
An unrecoverable fault has occurred on a circuit inside the inverter.
Product fit · Confirmed · 2 documented families
Show field stepsHide field steps for 2064: Device fault
Product fit
SUN2000-(8KTL–20KTL)-M2 · Three-phase string inverter
Confirmed · Manual Issue 06 · AU/region not confirmed · Firmware not documented
SUN2000-(20KTL–40KTL)-M3 · Three-phase string inverter
Confirmed · Manual Issue 02 · AU/region not confirmed · Firmware not documented
Safe checks now
Record the alarm, inverter indicators and software version if visible. Do not power-cycle, load firmware or alter communication wiring; contact the installer or Huawei support.
Installer remedy
A licensed installer should follow the exact M2 or M3 manual's controlled diagnostic and recovery procedure for this alarm. Do not substitute a generic switching sequence; if the alarm persists after the documented check, preserve the event evidence and escalate to Huawei support.
Remedy sourceSUN2000 M2 manualSUN2000 M3 manual
Manufacturer / escalation handoff
- 2065
Upgrade failed / software version mismatch
The upgrade did not complete normally.
Product fit · Confirmed · 2 documented families
Show field stepsHide field steps for 2065: Upgrade failed / software version mismatch
Product fit
SUN2000-(8KTL–20KTL)-M2 · Three-phase string inverter
Confirmed · Manual Issue 06 · AU/region not confirmed · Firmware not documented
SUN2000-(20KTL–40KTL)-M3 · Three-phase string inverter
Confirmed · Manual Issue 02 · AU/region not confirmed · Firmware not documented
Safe checks now
Record the alarm, inverter indicators and software version if visible. Do not power-cycle, load firmware or alter communication wiring; contact the installer or Huawei support.
Installer remedy
Retry the supported inverter upgrade. If it fails repeatedly, contact the dealer or Huawei technical support; do not install an unverified firmware package.
Remedy sourceSUN2000 M2 manualSUN2000 M3 manual
Manufacturer / escalation handoff
- 2066
Licence expired
The privilege certificate has entered its grace period; the privileged feature will become invalid soon.
Product fit · Confirmed · 2 documented families
Show field stepsHide field steps for 2066: Licence expired
Product fit
SUN2000-(8KTL–20KTL)-M2 · Three-phase string inverter
Confirmed · Manual Issue 06 · AU/region not confirmed · Firmware not documented
SUN2000-(20KTL–40KTL)-M3 · Three-phase string inverter
Confirmed · Manual Issue 02 · AU/region not confirmed · Firmware not documented
Safe checks now
Record the alarm, inverter indicators and software version if visible. Do not power-cycle, load firmware or alter communication wiring; contact the installer or Huawei support.
Installer remedy
Apply for and load a new privilege certificate through the authorised Huawei workflow.
Remedy sourceSUN2000 M2 manualSUN2000 M3 manual
Manufacturer / escalation handoff
- 2067
Faulty power collector
Communication with the power meter is interrupted.
Product fit · Confirmed · 2 documented families
Show field stepsHide field steps for 2067: Faulty power collector
Product fit
SUN2000-(8KTL–20KTL)-M2 · Three-phase string inverter
Confirmed · Manual Issue 06 · AU/region not confirmed · Firmware not documented
SUN2000-(20KTL–40KTL)-M3 · Three-phase string inverter
Confirmed · Manual Issue 02 · AU/region not confirmed · Firmware not documented
Safe checks now
Record the alarm and note whether monitoring or power-flow data is missing. Do not access the meter, RS485 wiring or switchboard; contact the installer if it persists.
Installer remedy
A licensed installer should confirm the power meter settings match the actual model, that its communications parameters match the inverter's RS485 settings, that it is powered on, and that the RS485 cable is connected correctly.
Remedy sourceSUN2000 M2 manualSUN2000 M3 manual
Manufacturer / escalation handoff
- 2068
Battery abnormal
The battery is faulty or disconnected, or the battery circuit breaker is off while the battery is running.
Show documented next stepHide detail for 2068: Battery abnormal
Documented next step
Record the battery indicator and alarm details. A qualified installer should verify the battery power, enable and communication connections and configuration; contact the battery supplier or Huawei if the alarm persists.
- 2070
Active islanding
During a grid AC outage, the inverter proactively detects islanding.
Show documented next stepHide detail for 2070: Active islanding
Documented next step
Contact your installer. Check that the grid-connection voltage of the inverter is normal.
- 2072
Transient AC over-voltage
The inverter detects that the phase voltage exceeds the transient AC over-voltage protection threshold.
Product fit · Confirmed · 2 documented families
Show field stepsHide field steps for 2072: Transient AC over-voltage
Product fit
SUN2000-(8KTL–20KTL)-M2 · Three-phase string inverter
Confirmed · Manual Issue 06 · AU/region not confirmed · Firmware not documented
SUN2000-(20KTL–40KTL)-M3 · Three-phase string inverter
Confirmed · Manual Issue 02 · AU/region not confirmed · Firmware not documented
Safe checks now
Record the alarm, cause ID if shown, and time; check only whether the property has grid supply and allow the inverter to recover. If it repeats, contact the installer; do not change protected grid settings.
Installer remedy
A licensed installer should verify voltage at the grid connection point and its peak value. Contact the network operator if supply is too high; change the protection threshold only with network approval.
Remedy sourceSUN2000 M2 manualSUN2000 M3 manual
Manufacturer / escalation handoff
- 2077
Off-grid output overload
The off-grid output is overloaded or short-circuited.
Show documented next stepHide detail for 2077: Off-grid output overload
Documented next step
Reduce non-essential loads on the backed-up circuit. If it does not clear, a licensed installer should check for an output short circuit and verify that the load configuration is within the device rating.
- 2080
Abnormal PV module configuration
PV module configuration does not meet requirements, or the module output is reverse-connected or short-circuited. Cause IDs: 2: too many optimisers in a single string; 3: too few optimisers in a string, or abnormal sunlight; 5: abnormal optimiser output voltage; 6: abnormal string or parallel connection; 7: string configuration changed.
Show documented next stepHide detail for 2080: Abnormal PV module configuration
Documented next step
Contact your installer. Check that the total number of PV modules, the number per string, and the number of strings meet requirements, and that module output is not reverse-connected.
- 2081
Optimiser fault
The optimiser is offline or faulty.
Show documented next stepHide detail for 2081: Optimiser fault
Documented next step
Contact your dealer or Huawei technical support for optimiser replacement.
- 2082
Grid-tied / off-grid controller abnormal
The inverter fails to communicate with the Smart Backup Box, or an unrecoverable fault has occurred inside the Smart Backup Box.
Show documented next stepHide detail for 2082: Grid-tied / off-grid controller abnormal
Documented next step
A licensed installer should follow the exact model shutdown procedure, inspect the power and RS485 connections between the inverter and backup controller, and contact Huawei if the alarm persists.
- 2085
Built-in PID operation abnormal
The output resistance of the PV arrays to ground is low, or the system insulation resistance is low.
Product fit · Confirmed · SUN2000-(20KTL–40KTL)-M3
Show field stepsHide field steps for 2085: Built-in PID operation abnormal
Product fit
SUN2000-(20KTL–40KTL)-M3 · Three-phase string inverter
Confirmed · Manual Issue 02 · AU/region not confirmed · Firmware not documented
Safe checks now
Record the alarm and cause ID if shown, leave PV, AC and earthing wiring and isolators untouched, and contact the installer. Electrical measurements and recovery work require a licensed worker.
Installer remedy
A licensed installer should follow the exact M2 or M3 manual's controlled diagnostic and recovery procedure for this alarm. Do not substitute a generic switching sequence; if the alarm persists after the documented check, preserve the event evidence and escalate to Huawei support.
Remedy sourceSUN2000 M3 manual
Manufacturer / escalation handoff
- 2090
Abnormal active power scheduling instruction
The DI input is abnormal, or inconsistent with the configuration.
Show documented next stepHide detail for 2090: Abnormal active power scheduling instruction
Documented next step
A qualified installer should verify the DI-port wiring and active-power dry-contact mapping, then confirm the required mapping with the network operator.
- 2091
Abnormal reactive power scheduling instruction
The DI input is abnormal, or inconsistent with the configuration.
Show documented next stepHide detail for 2091: Abnormal reactive power scheduling instruction
Documented next step
A qualified installer should verify the DI-port wiring and reactive-power dry-contact mapping, then confirm the required mapping with the network operator.
- 61440
Monitoring unit faulty
The flash memory is insufficient, or it has bad sectors.
Product fit · Confirmed · 2 documented families
Show field stepsHide field steps for 61440: Monitoring unit faulty
Product fit
SUN2000-(8KTL–20KTL)-M2 · Three-phase string inverter
Confirmed · Manual Issue 06 · AU/region not confirmed · Firmware not documented
SUN2000-(20KTL–40KTL)-M3 · Three-phase string inverter
Confirmed · Manual Issue 02 · AU/region not confirmed · Firmware not documented
Safe checks now
Record the alarm, inverter indicators and software version if visible. Do not power-cycle, load firmware or alter communication wiring; contact the installer or Huawei support.
Installer remedy
A licensed installer should follow the exact M2 or M3 manual's controlled diagnostic and recovery procedure for this alarm. Do not substitute a generic switching sequence; if the alarm persists after the documented check, preserve the event evidence and escalate to Huawei support.
Remedy sourceSUN2000 M2 manualSUN2000 M3 manual
Manufacturer / escalation handoff
Sources
- ManufacturerHuawei Inverter Alarm Reference, Issue 10
- ManufacturerSUN2000-(8KTL-20KTL)-M2 User Manual, Issue 06 (2022-03-10): Alarm List
- ManufacturerSUN2000-(20KTL, 29.9KTL, 30KTL, 36KTL, 40KTL)-M3 User Manual, Issue 02 (2022-02-08): Alarm List
- ManufacturerHuawei SUN2000 inverter warranty and service conditions: Australian model schedule (2024-02-20)
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Frequently asked
- Where do these Huawei fault codes come from?
- Compiled from publicly available Huawei inverter and battery documentation and field references, then rewritten for the trade. Wattbench is independent and not affiliated with Huawei.
- 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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