Where do these SMA fault codes come from?

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

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

SMA Error Codes

SMA event-code reference with source-linked remedies for Australian Sunny Tripower X models and explicit boundaries around older Sunny Boy and mixed-family records.

Sources listedReviewed August 2026Source: SMA manuals & field referencesOur methodology

Manufacturer: SMA
Codes documented: 25
Source: SMA manuals & field references
Scope: Reference only

25 of 25 codes

About this fault librarySources · scope

A reference compiled by Wattbench from SMA documentation. SMA reports faults as numbered event codes on the inverter display or in Sunny Portal / SMA 360°. Source-linked homeowner and installer remedies are reviewed for the Australian Sunny Tripower X 12/15/20/25 (STP12-50–STP25-50) family. Other grouped Sunny Boy and earlier-family records remain searchable reference and do not inherit Tripower X applicability. Safety: owners should record the event and stop at safely visible conditions. DC/AC switching, wiring, insulation tests, protected parameters and opening equipment are licensed-installer tasks.

Key takeaways

25 SMA fault and alarm codes, documented for the trade.
Compiled from published documentation and field references; Wattbench is independent and not affiliated with SMA.
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.

101 · 102 · 103 · 105
Grid voltage / impedance too high
The grid voltage or grid impedance at the inverter's connection point is too high, so it disconnects.
Product fit · Confirmed · Sunny Tripower X 12/15/20/25
Show field stepsHide field steps for 101 · 102 · 103 · 105: Grid voltage / impedance too high
Product fit
- Sunny Tripower X 12/15/20/25 · Three-phase string inverter
  Confirmed · STP12-50–STP25-50 · Firmware 2.06.04.R or later
Safe checks now
Record the event 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 the country dataset or protected grid parameters.
Installer remedy
Usually a network issue rather than a faulty inverter. Confirm the country dataset is correct and the grid voltage is in range; if it's frequently high, contact your installer or network operator. It self-restores when voltage returns to range.
Remedy sourceSunny Tripower X events
Manufacturer / escalation handoff
202 · 203 · 205
Grid disconnected / voltage too low
The grid has been disconnected, the AC cable is damaged, or the grid voltage is too low.
Show documented next stepHide detail for 202 · 203 · 205: Grid disconnected / voltage too low
Documented next step
Check the AC circuit breaker / main switch is on and the grid is present. If the grid is fine and it persists, have an installer inspect the AC cable and connections.
301
10-minute average voltage out of range
The ten-minute average grid voltage is outside the permissible range.
Product fit · Confirmed · Sunny Tripower X 12/15/20/25
Show field stepsHide field steps for 301: 10-minute average voltage out of range
Product fit
- Sunny Tripower X 12/15/20/25 · Three-phase string inverter
  Confirmed · STP12-50–STP25-50 · Firmware 2.06.04.R or later
Safe checks now
Record the event 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 the country dataset or protected grid parameters.
Installer remedy
Monitor the grid voltage during operation. If it's persistently out of range due to local conditions, contact your network operator.
Remedy sourceSunny Tripower X events
Manufacturer / escalation handoff
302
Power reduced: high AC voltage
The inverter has reduced its output because the grid voltage is high (Volt-Watt response, to support grid stability).
Product fit · Confirmed · Sunny Tripower X 12/15/20/25
Show field stepsHide field steps for 302: Power reduced: high AC voltage
Product fit
- Sunny Tripower X 12/15/20/25 · Three-phase string inverter
  Confirmed · STP12-50–STP25-50 · Firmware 2.06.04.R or later
Safe checks now
Record the event 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 the country dataset or protected grid parameters.
Installer remedy
Expected behaviour when grid voltage is high, not a fault. If it happens often it's costing you generation. Your network voltage is high; contact your installer or network operator.
Remedy sourceSunny Tripower X events
Manufacturer / escalation handoff
401 · 404
Islanding / frequency change
A stand-alone (islanded) grid or a very large change in grid frequency was detected.
Product fit · Confirmed · Sunny Tripower X 12/15/20/25
Show field stepsHide field steps for 401 · 404: Islanding / frequency change
Product fit
- Sunny Tripower X 12/15/20/25 · Three-phase string inverter
  Confirmed · STP12-50–STP25-50 · Firmware 2.06.04.R or later
Safe checks now
Record the event 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 the country dataset or protected grid parameters.
Installer remedy
Usually a short-term grid event that self-clears. If it recurs, have your installer check the grid connection for frequency fluctuations.
Remedy sourceSunny Tripower X events
Manufacturer / escalation handoff
501
Grid frequency out of range
The power frequency is outside the permissible range.
Product fit · Confirmed · Sunny Tripower X 12/15/20/25
Show field stepsHide field steps for 501: Grid frequency out of range
Product fit
- Sunny Tripower X 12/15/20/25 · Three-phase string inverter
  Confirmed · STP12-50–STP25-50 · Firmware 2.06.04.R or later
Safe checks now
Record the event 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 the country dataset or protected grid parameters.
Installer remedy
Monitor the frequency. If fluctuations are frequent, common on a backup generator, contact your network operator.
Remedy sourceSunny Tripower X events
Manufacturer / escalation handoff
601
Excess DC in grid current
The inverter detected an excessively high proportion of direct current in the grid current.
Product fit · Confirmed · Sunny Tripower X 12/15/20/25
Show field stepsHide field steps for 601: Excess DC in grid current
Product fit
- Sunny Tripower X 12/15/20/25 · Three-phase string inverter
  Confirmed · STP12-50–STP25-50 · Firmware 2.06.04.R or later
Safe checks now
Record the event 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 the country dataset or protected grid parameters.
Installer remedy
A licensed installer should verify the event, grid-current condition and current country dataset against the STPxx-50 event manual. Do not raise a monitoring threshold without the required network approval; escalate a recurring event to SMA service.
Remedy sourceSunny Tripower X events
Manufacturer / escalation handoff
901
Grounding (PE) connection missing
The protective-earth (grounding) conductor is not correctly connected.
Show documented next stepHide detail for 901: Grounding (PE) connection missing
Documented next step
An electrical-safety fault. Have a licensed electrician or installer check the earth connection against the installation manual. Don't keep resetting it.
1001
Line and neutral swapped
The L (active) and N (neutral) connections are swapped.
Product fit · Confirmed · Sunny Tripower X 12/15/20/25
Show field stepsHide field steps for 1001: Line and neutral swapped
Product fit
- Sunny Tripower X 12/15/20/25 · Three-phase string inverter
  Confirmed · STP12-50–STP25-50 · Firmware 2.06.04.R or later
Safe checks now
Record the event, leave AC, PV and earthing wiring and isolators untouched, and contact the installer. Wiring and insulation checks require a licensed worker.
Installer remedy
A wiring fault. Have your installer correct the L and N connections per the installation manual.
Remedy sourceSunny Tripower X events
Manufacturer / escalation handoff
1302
Waiting for grid voltage
L or N is not connected (or an AC conductor is damaged), often simply a mains outage.
Product fit · Confirmed · Sunny Tripower X 12/15/20/25
Show field stepsHide field steps for 1302: Waiting for grid voltage
Product fit
- Sunny Tripower X 12/15/20/25 · Three-phase string inverter
  Confirmed · STP12-50–STP25-50 · Firmware 2.06.04.R or later
Safe checks now
Record the event 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 the country dataset or protected grid parameters.
Installer remedy
If there's a power cut, it clears when supply returns. Otherwise check the AC main switch is on and the breaker hasn't tripped; if it persists, have an installer check the AC conductors.
Remedy sourceSunny Tripower X events
Manufacturer / escalation handoff
1501
Reconnection fault (country dataset)
A changed country dataset or parameter value doesn't match local requirements.
Product fit · Confirmed · Sunny Tripower X 12/15/20/25
Show field stepsHide field steps for 1501: Reconnection fault (country dataset)
Product fit
- Sunny Tripower X 12/15/20/25 · Three-phase string inverter
  Confirmed · STP12-50–STP25-50 · Firmware 2.06.04.R or later
Safe checks now
Record the event and leave protected settings and self-test controls to the responsible installer. Contact the installer if the event blocks operation or repeats.
Installer remedy
The responsible installer should verify the Australian country dataset and protected parameter state against the STPxx-50 manual. Use authorised credentials only for an approved change; do not alter grid settings merely to clear the event.
Remedy sourceSunny Tripower X events
Manufacturer / escalation handoff
3301 · 3302 · 3303
Unstable operation (low DC)
There isn't enough power at the DC input for stable operation.
Show documented next stepHide detail for 3301 · 3302 · 3303: Unstable operation (low DC)
Documented next step
Often just low light, shading, or snow on the array. Check the panels are clear and the array is error-free; if it persists in good sun, contact your installer.
3401 · 3402 · 3407
DC over-voltage
Over-voltage at the DC input. This can destroy the inverter.
Show documented next stepHide detail for 3401 · 3402 · 3407: DC over-voltage
Documented next step
Switch off the DC isolator and contact your installer immediately. The DC input voltage is above the inverter's maximum. The string is likely sized too long and must be corrected by a professional before reconnection.
3501
Insulation failure (ground fault)
A ground fault / low insulation resistance detected on the DC (PV) side, safety-critical, and common in wet weather.
Product fit · Confirmed · Sunny Tripower X 12/15/20/25
Show field stepsHide field steps for 3501: Insulation failure (ground fault)
Product fit
- Sunny Tripower X 12/15/20/25 · Three-phase string inverter
  Confirmed · STP12-50–STP25-50 · Firmware 2.06.04.R or later
Safe checks now
Record the event, leave AC, PV and earthing wiring and isolators untouched, and contact the installer. Wiring and insulation checks require a licensed worker.
Installer remedy
A licensed installer should follow the STPxx-50 event procedure to locate and rectify the PV insulation or residual-current cause under safe isolation. Clear the event only after the fault is corrected; do not transfer a Sunny Boy reset instruction to this Tripower X record.
Remedy sourceSunny Tripower X events
Manufacturer / escalation handoff
3701
Residual current too high
The inverter detected an excessive residual (earth-leakage) current, an electric-shock hazard.
Product fit · Confirmed · Sunny Tripower X 12/15/20/25
Show field stepsHide field steps for 3701: Residual current too high
Product fit
- Sunny Tripower X 12/15/20/25 · Three-phase string inverter
  Confirmed · STP12-50–STP25-50 · Firmware 2.06.04.R or later
Safe checks now
Record the event, leave AC, PV and earthing wiring and isolators untouched, and contact the installer. Wiring and insulation checks require a licensed worker.
Installer remedy
A licensed installer should follow the STPxx-50 event procedure to locate and rectify the PV insulation or residual-current cause under safe isolation. Clear the event only after the fault is corrected; do not transfer a Sunny Boy reset instruction to this Tripower X record.
Remedy sourceSunny Tripower X events
Manufacturer / escalation handoff
3801 · 3802 · 3805
DC over-current
Over-current at the DC input; the inverter briefly interrupts feed-in.
Show documented next stepHide detail for 3801 · 3802 · 3805: DC over-current
Documented next step
If it's frequent, have your installer verify the PV array is correctly rated and wired (and check for a short circuit).
3901 · 3902
Waiting for DC start conditions
The conditions for feeding into the grid aren't yet met, typically insufficient irradiation.
Product fit · Confirmed · Sunny Tripower X 12/15/20/25
Show field stepsHide field steps for 3901 · 3902: Waiting for DC start conditions
Product fit
- Sunny Tripower X 12/15/20/25 · Three-phase string inverter
  Confirmed · STP12-50–STP25-50 · Firmware 2.06.04.R or later
Safe checks now
Note the time and check only for safely visible shading or low light. If the event remains in good daylight, contact the installer; do not operate isolators.
Installer remedy
Normal early/late in the day. Make sure the array isn't covered or shaded; if it persists in good sun, contact your installer.
Remedy sourceSunny Tripower X events
Manufacturer / escalation handoff
6501 · 6502 · 6509
Over-temperature
The inverter has switched off (or derated) due to excessive temperature.
Show documented next stepHide detail for 6501 · 6502 · 6509: Over-temperature
Documented next step
Clear dust from the cooling fins and air ducts, ensure good ventilation, and keep the ambient temperature within limits (and the unit out of direct sun). If it persists, contact your installer.
6512
Minimum operating temperature not reached
It's too cold. The inverter only resumes feed-in once the temperature reaches at least −25 °C.
Product fit · Confirmed · Sunny Tripower X 12/15/20/25
Show field stepsHide field steps for 6512: Minimum operating temperature not reached
Product fit
- Sunny Tripower X 12/15/20/25 · Three-phase string inverter
  Confirmed · STP12-50–STP25-50 · Firmware 2.06.04.R or later
Safe checks now
No action is normally required. Record the event and allow the inverter to resume when its operating temperature is reached.
Installer remedy
No action needed; it resumes automatically as the temperature rises.
Remedy sourceSunny Tripower X events
Manufacturer / escalation handoff
7500 · 7501
Fan fault
A cooling fan is not functioning properly.
Show documented next stepHide detail for 7500 · 7501: Fan fault
Documented next step
Check the fan area for blockage. If the fan is faulty it needs service. Contact your installer or SMA Service.
7701 · 7702 · 7703
Grid relay defect
The grid disconnection relay is defective or failed its test.
Show documented next stepHide detail for 7701 · 7702 · 7703: Grid relay defect
Documented next step
A hardware fault. Contact SMA Service or your installer. If shown only occasionally, note whether it recurs.
8003
Power reduced: temperature
The inverter has reduced output for more than ten minutes because of excessive temperature.
Show documented next stepHide detail for 8003: Power reduced: temperature
Documented next step
Clean the cooling fins and air ducts, ensure adequate ventilation, and keep the ambient temperature within the rated limit. If it recurs, contact your installer.
9002
Grid Guard code invalid
The SMA Grid Guard code entered is incorrect, so the protected operating parameters stay locked.
Product fit · Confirmed · Sunny Tripower X 12/15/20/25
Show field stepsHide field steps for 9002: Grid Guard code invalid
Product fit
- Sunny Tripower X 12/15/20/25 · Three-phase string inverter
  Confirmed · STP12-50–STP25-50 · Firmware 2.06.04.R or later
Safe checks now
Record the event and leave protected settings and self-test controls to the responsible installer. Contact the installer if the event blocks operation or repeats.
Installer remedy
The responsible installer should verify the Australian country dataset and protected parameter state against the STPxx-50 manual. Use authorised credentials only for an approved change; do not alter grid settings merely to clear the event.
Remedy sourceSunny Tripower X events
Manufacturer / escalation handoff
9003
Grid parameters locked
Changes to the grid parameters are now blocked (they require the Grid Guard code).
Product fit · Confirmed · Sunny Tripower X 12/15/20/25
Show field stepsHide field steps for 9003: Grid parameters locked
Product fit
- Sunny Tripower X 12/15/20/25 · Three-phase string inverter
  Confirmed · STP12-50–STP25-50 · Firmware 2.06.04.R or later
Safe checks now
Record the event and leave protected settings and self-test controls to the responsible installer. Contact the installer if the event blocks operation or repeats.
Installer remedy
The responsible installer should verify the Australian country dataset and protected parameter state against the STPxx-50 manual. Use authorised credentials only for an approved change; do not alter grid settings merely to clear the event.
Remedy sourceSunny Tripower X events
Manufacturer / escalation handoff
9007
Self-test aborted
The inverter's self-test was terminated.
Product fit · Confirmed · Sunny Tripower X 12/15/20/25
Show field stepsHide field steps for 9007: Self-test aborted
Product fit
- Sunny Tripower X 12/15/20/25 · Three-phase string inverter
  Confirmed · STP12-50–STP25-50 · Firmware 2.06.04.R or later
Safe checks now
Record the event and leave protected settings and self-test controls to the responsible installer. Contact the installer if the event blocks operation or repeats.
Installer remedy
A licensed installer should verify the AC connection and repeat the self-test only through the STPxx-50 documented procedure. Preserve the result and escalate repeated aborts to SMA service rather than changing protected settings.
Remedy sourceSunny Tripower X events
Manufacturer / escalation handoff

Sources

ManufacturerSMA Sunny Tripower X (STPxx-50) event messages
ManufacturerSMA Australia: Sunny Tripower X 12/15/20/25
ManufacturerSMA Australia: AS/NZS 4777:2020 model and firmware requirements

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Frequently asked

Where do these SMA fault codes come from?: Compiled from publicly available SMA inverter and battery documentation and field references, then rewritten for the trade. Wattbench is independent and not affiliated with SMA.
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.

Keep exploring

Other fault libraries

Inverter Fault Library

Grid voltage / impedance too high

Product fit

Safe checks now

Installer remedy

Grid disconnected / voltage too low

Documented next step

10-minute average voltage out of range

Product fit

Safe checks now

Installer remedy

Power reduced: high AC voltage

Product fit

Safe checks now

Installer remedy

Islanding / frequency change

Product fit

Safe checks now

Installer remedy

Grid frequency out of range

Product fit

Safe checks now

Installer remedy

Excess DC in grid current

Product fit

Safe checks now

Installer remedy

Grounding (PE) connection missing

Documented next step

Line and neutral swapped

Product fit

Safe checks now

Installer remedy

Waiting for grid voltage

Product fit

Safe checks now

Installer remedy

Reconnection fault (country dataset)

Product fit

Safe checks now

Installer remedy

Unstable operation (low DC)

Documented next step

DC over-voltage

Documented next step

Insulation failure (ground fault)

Product fit

Safe checks now

Installer remedy

Residual current too high

Product fit

Safe checks now

Installer remedy

DC over-current

Documented next step

Waiting for DC start conditions

Product fit

Safe checks now

Installer remedy

Over-temperature

Documented next step

Minimum operating temperature not reached

Product fit

Safe checks now

Installer remedy

Fan fault

Documented next step

Grid relay defect

Documented next step

Power reduced: temperature

Documented next step

Grid Guard code invalid

Product fit

Safe checks now

Installer remedy

Grid parameters locked

Product fit

Safe checks now

Installer remedy

Self-test aborted

Product fit