Choose a product family above to show its card.
Owner handover card
Huawei: when the display shows a code
Fault library: Huawei (SUN2000 series)
Model families documented for these codes: SUN2000-(8KTL–20KTL)-M2; SUN2000-(20KTL–40KTL)-M3
- Manual cited: SUN2000-(8KTL-20KTL)-M2 User Manual, Issue 06 (2022-03-10): Alarm List · Revision Issue 06
- Manual cited: SUN2000-(20KTL, 29.9KTL, 30KTL, 36KTL, 40KTL)-M3 User Manual, Issue 02 (2022-02-08): Alarm List · Revision Issue 02
If one of these codes appears
- 2032 Grid failure
- 2033 Grid under-voltage
- 2034 Grid over-voltage
- and 7 more codes with this action
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.
Product fit · Confirmed · SUN2000-(8KTL–20KTL)-M2
Product fit · Confirmed · SUN2000-(20KTL–40KTL)-M3
- 2001 High string input voltage
- 2002 DC arc fault
- 2011 String reversed
- and 6 more codes with this action
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.
Product fit · Confirmed · SUN2000-(8KTL–20KTL)-M2
Product fit · Confirmed · SUN2000-(20KTL–40KTL)-M3
- 2064 Device fault
- 2065 Upgrade failed / software version mismatch
- 2066 Licence expired
- and 1 more code with this action
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.
Product fit · Confirmed · SUN2000-(8KTL–20KTL)-M2
Product fit · Confirmed · SUN2000-(20KTL–40KTL)-M3
- 2003 DC arc fault
- 2085 Built-in PID operation abnormal
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.
Product fit · Confirmed · SUN2000-(20KTL–40KTL)-M3
- 2080 Abnormal PV module configuration
- 2081 Optimiser fault
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.
Product fit · Confirmed · SUN2000-(8KTL–20KTL)-M2
This card lists 13 of the 31 Huawei codes that have a reviewed owner action. Owner actions are the reviewed homeowner remedies in the Wattbench Huawei fault library, reviewed 2 August 2026; codes and titles are shown as the library records them. Every code: wattbench.ai/huawei-inverter-error-codes
Safety note from the Huawei fault library: 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.
Owner handover card
Fronius: when the display shows a code
Fault library: Fronius
Model families documented for these codes: Fronius Symo / Fronius Eco
- Manual cited: Fronius Symo / Fronius Eco Operating Instructions: Status diagnosis and troubleshooting (official) · Revision 044-17072025
If one of these codes appears
- 112 RCMU error
- 425 No communication with power stage
- 436 Board incompatibility
- and 4 more codes with this action
Record the exact state code, inverter model and time. Do not operate isolators, open the inverter or touch wiring; contact your installer if the state remains or returns.
Product fit · Confirmed · Fronius Symo / Fronius Eco
- 102 AC voltage too high
- 103 AC voltage too low
- 105 AC frequency too high
- and 3 more codes with this action
Note the state code, time and whether the property and neighbourhood have normal grid supply. The inverter should reconnect automatically when the grid returns to its permitted range; contact your installer if the state persists or repeats.
Product fit · Confirmed · Fronius Symo / Fronius Eco
- 301 Overcurrent (AC)
- 302 Overcurrent (DC)
Record the state code and wait for the inverter's automatic start-up attempt. Do not operate isolators or open the inverter; contact your installer if the state remains or returns.
Product fit · Confirmed · Fronius Symo / Fronius Eco
- 303 DC module over-temperature
- 304 AC module over-temperature
From a safe position, check that the external cooling openings are not visibly obstructed and allow the inverter to cool. Do not open the unit; contact your installer if the state persists.
Product fit · Confirmed · Fronius Symo / Fronius Eco
- 306 · POWER LOW PV output too low
Wait for stronger daylight. This state is expected when solar input is too low and should clear automatically; contact your installer if it remains in good sunlight.
Product fit · Confirmed · Fronius Symo / Fronius Eco
This card lists 11 of the 29 Fronius codes that have a reviewed owner action. Owner actions are the reviewed homeowner remedies in the Wattbench Fronius fault library, reviewed 2 August 2026; codes and titles are shown as the library records them. Every code: wattbench.ai/fronius-error-codes
Safety note from the Fronius fault library: owners should record the state and stop at safe visual observations. DC/AC isolation, electrical measurements, settings, wiring and opening equipment are licensed-worker tasks, completed under the exact model and site procedure.
Owner handover card
SMA: when the display shows a code
Fault library: SMA
Model families documented for these codes: Sunny Tripower X 12/15/20/25
- Manual cited: SMA Sunny Tripower X (STPxx-50) event messages
If one of these codes appears
- 101 · 102 · 103 · 105 Grid voltage / impedance too high
- 301 10-minute average voltage out of range
- 302 Power reduced: high AC voltage
- and 4 more codes with this action
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.
Product fit · Confirmed · Sunny Tripower X 12/15/20/25
- 1501 Reconnection fault (country dataset)
- 9002 Grid Guard code invalid
- 9003 Grid parameters locked
- and 1 more code with this action
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.
Product fit · Confirmed · Sunny Tripower X 12/15/20/25
- 1001 Line and neutral swapped
- 3501 Insulation failure (ground fault)
- 3701 Residual current too high
Record the event, leave AC, PV and earthing wiring and isolators untouched, and contact the installer. Wiring and insulation checks require a licensed worker.
Product fit · Confirmed · Sunny Tripower X 12/15/20/25
- 3901 · 3902 Waiting for DC start conditions
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.
Product fit · Confirmed · Sunny Tripower X 12/15/20/25
- 6512 Minimum operating temperature not reached
No action is normally required. Record the event and allow the inverter to resume when its operating temperature is reached.
Product fit · Confirmed · Sunny Tripower X 12/15/20/25
This card lists 11 of the 16 SMA codes that have a reviewed owner action. Owner actions are the reviewed homeowner remedies in the Wattbench SMA fault library, reviewed 2 August 2026; codes and titles are shown as the library records them. Every code: wattbench.ai/sma-error-codes
Safety note from the SMA fault library: 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.
Owner handover card
Sungrow: when the display shows a code
Fault library: Sungrow
Model families documented for these codes: SH5T–SH25T
- Manual cited: Sungrow SH5T/6T/8T/10T/12T/15T/20T/25T three-phase hybrid inverter user manual, version 17 (2025-04) · Revision Version 17 (2025-04)
If one of these codes appears
- 703 Battery average under-voltage
- 711 Instantaneous battery over-voltage
- 712 Battery average over-voltage
- and 11 more codes with this action
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.
Product fit · Confirmed · SH5T–SH25T
- 008 Grid over-frequency
- 009 Grid under-frequency
- 013 Grid abnormal
- and 3 more codes with this action
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.
Product fit · Confirmed · SH5T–SH25T
- 002 Grid over-voltage
- 004 Grid under-voltage
- 005 Grid under-voltage (lower threshold)
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.
Product fit · Confirmed · SH5T–SH25T
- 028 PV1 reverse connection
- 029 PV2 reverse connection
Record the code, leave PV cables and isolators untouched, and contact the installer. Reversed-polarity checks are electrical work.
Product fit · Confirmed · SH5T–SH25T
- 733 Battery over-temperature protection
- 933 Battery over-temperature warning
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.
Product fit · Confirmed · SH5T–SH25T
This card lists 13 of the 41 Sungrow codes that have a reviewed owner action. Owner actions are the reviewed homeowner remedies in the Wattbench Sungrow fault library, reviewed 2 August 2026; codes and titles are shown as the library records them. Every code: wattbench.ai/sungrow-alarm-codes
Safety note from the Sungrow fault library: 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.
Owner handover card
Growatt: when the display shows a code
Fault library: Growatt
Rows marked brand-level guidance are not confirmed for a particular model.
- Manual cited: Growatt MOD 3–10KTL3-XA Installation & Operation Manual, August 2023
If one of these codes appears
- Warning 404 · EEPROM abnormal EEPROM abnormal
- Warning 405 · Firmware version mismatch DSP and COM firmware version mismatch
- Warning 406 · Boost module error Boost module error
- and 26 more codes with this action
Record the exact Warning or Error number and the time. Do not repeatedly restart the inverter or change settings; contact the installer if the message does not clear.
Product fit · Unknown · brand-level guidance
- Warning 500 · Lithium battery communication failed Lithium battery communication failed
- Warning 501 · Battery terminal open Battery terminal open
- Warning 502 · Battery voltage high Battery voltage high
- and 19 more codes with this action
Record the code and the battery state shown in the app. Do not alter battery settings, BMS wiring or terminals; contact the installer if the message does not clear.
Product fit · Unknown · brand-level guidance
- Warning 200 · String fault String fault
- Warning 201 · String PID terminal detection error String PID quick-connect terminal detection error
- Warning 202 · DC SPD abnormal DC surge protection abnormal
- and 12 more codes with this action
Record the exact Warning or Error number and the time. Do not operate isolators, open the inverter or touch wiring to investigate; contact the installer if the message remains.
Product fit · Unknown · brand-level guidance
- Warning 602 · Off-grid output voltage low Off-grid output voltage too low
- Warning 603 · Off-grid output voltage high Off-grid output voltage too high
- Warning 607 · Off-grid box communication abnormal Off-grid box communication abnormal
- and 12 more codes with this action
Record the code and whether backup power is currently needed. Do not operate the off-grid box, generator or inverter switches; contact the installer if the condition remains.
Product fit · Unknown · brand-level guidance
- Warning 207 · USB over-current USB (U-disk) over-current protection
- Warning 304 · CT open or wrong CT open or wrong
- Warning 305 · CT reversed or ground fail CT line reversed or ground fail
- and 6 more codes with this action
Record the code and note whether monitoring data is missing. This family concerns metering and communication accessories; do not access the meter, CT or wiring, and contact the installer if it persists.
Product fit · Unknown · brand-level guidance
This card lists 15 of the 112 Growatt codes that have a reviewed owner action. Owner actions are the reviewed homeowner remedies in the Wattbench Growatt fault library, reviewed 3 August 2026; codes and titles are shown as the library records them. Every code: wattbench.ai/growatt-error-codes
Safety note from the Growatt fault library: owners should record the code and contact their installer. Isolation, measurements, wiring, parameter changes and internal repairs are licensed-worker tasks.
Owner handover card
GoodWe: when the display shows a code
Fault library: GoodWe
Model families documented for these codes: ETC Series; ET G2 6–15 kW; ET Series / ET Plus Series
- Manual cited: GoodWe ETC Series User Manual V1.1 (official) · Revision V1.1
- Manual cited: GoodWe ET G2 6–15 kW User Manual V2.1 (official) · Revision V2.1
- Manual cited: GoodWe Official FAQs: inverter error displays & troubleshooting (official)
- Manual cited: GoodWe ET Series User Manual V1.1 (official) · Revision V1.1
If one of these codes appears
- 1 SPI failure
- 2 EEPROM R/W failure
- 7 · 25 Relay check failure
- and 4 more codes with this action
Record the exact code, inverter model and time. Do not operate isolators or open the inverter; contact your installer or GoodWe if the code remains.
Product fit · Confirmed · ETC Series
- F132 · Internal Fan Abnormal Internal fan abnormal
- F30 · AC HCT Check Abnormal AC current-sensor (HCT) check abnormal
- F31 · GFCI HCT Check Abnormal Leakage-current sensor (GFCI HCT) check abnormal
- and 1 more code with this action
Record the exact code, inverter model and time. Do not operate isolators or open the inverter; contact your installer or GoodWe if the code remains.
Product fit · Confirmed · ET G2 6–15 kW
- 3 · Fac Failure Grid frequency fault
Note when the alarm occurs and whether the property supply appears normal. It should clear when grid frequency returns to range; contact your installer if it persists or repeats.
Product fit · Confirmed · ET Series / ET Plus Series
- 14 · Isolation Fail Isolation failure
Record the code, time and weather conditions. Do not reset the inverter, touch PV connectors or operate isolators; arrange a licensed inspection if it persists or returns.
Product fit · Confirmed · ET Series / ET Plus Series
- 15 · Vac Failure Grid voltage fault
Note when the alarm occurs and whether other equipment has lost supply. The inverter should reconnect when grid voltage returns to range; contact your installer if it persists or repeats.
Product fit · Confirmed · ET Series / ET Plus Series
This card lists 9 of the 20 GoodWe codes that have a reviewed owner action. Owner actions are the reviewed homeowner remedies in the Wattbench GoodWe fault library, reviewed 2 August 2026; codes and titles are shown as the library records them. Every code: wattbench.ai/goodwe-error-codes
Safety note from the GoodWe fault library: earth, insulation and PV over-voltage faults need a licensed worker. An owner should record the alarm and keep clear of isolators, wiring and connectors while the responsible installer follows the exact product procedure.
Owner handover card
Solis: when the display shows a code
Fault library: Solis (Ginlong)
Rows marked brand-level guidance are not confirmed for a particular model.
- Manual cited: Solis Inverter Alarm Codes — Complete List, North America service centre
- Manual cited: Solis service guide: inverter will not turn on
If one of these codes appears
- OV-BUS Over DC bus voltage
- UN-BUS01/02 Under DC bus voltage
- OV-G-I Over grid current
- and 11 more codes with this action
Record the exact alarm, model and time. Do not repeatedly restart the inverter, operate isolators or open equipment; contact the installer if the alarm does not clear.
Product fit · Unknown · brand-level guidance
- OV-G-V01–05 Over grid voltage
- UN-G-V01/02 Under grid voltage
- OV-G-F01/02 Over grid frequency
- and 3 more codes with this action
Record the alarm, time and whether the premises supply appears normal. Do not change the grid standard or protection settings; contact the installer if the alarm repeats.
Product fit · Unknown · brand-level guidance
- Reverse-DC DC polarity reversed
- OV-DC01–02 Over DC voltage
- PV ISO-PRO01/02 PV insulation protection
- and 3 more codes with this action
Record the exact alarm and weather conditions, keep clear of the array and do not reset the inverter or operate DC equipment. Arrange a licensed inspection promptly.
Product fit · Unknown · brand-level guidance
- LCD blank No display / inverter will not turn on
Record that the display and indicators are blank. Do not operate DC equipment or test live circuits; contact the installer to follow the Solis no-display procedure.
Product fit · Unknown · brand-level guidance
- Waiting / SoftRun (init loop) Waiting or SoftRun does not clear
Record the exact displayed message and system state. Do not change settings, operate isolators or open equipment; contact the installer if the condition remains.
Product fit · Unknown · brand-level guidance
This card lists 11 of the 29 Solis codes that have a reviewed owner action. Owner actions are the reviewed homeowner remedies in the Wattbench Solis fault library, reviewed 2 August 2026; codes and titles are shown as the library records them. Every code: wattbench.ai/solis-alarm-codes
Safety note from the Solis fault library: owners should record the alarm and safely visible conditions. DC/AC isolation, measurements, connectors, wiring, settings and internal work are licensed-installer tasks performed to the exact model manual.
Owner handover card
SolaX: when the display shows a code
Fault library: SolaX Power (X1 / X3 string and hybrid inverters)
Model families documented for these codes: X1-Hybrid G4 Series; X3-Hybrid G4 Series
- Manual cited: SolaX X1-Hybrid G4 Series user manual
- Manual cited: SolaX X3-Hybrid G4 Series user manual, version 7 · Revision Version 7
- Manual cited: SolaX Power help centre: Grid Relay Fault
- Manual cited: SolaX Power knowledge base: Grid Lost Fault
If one of these codes appears
- Bat Volt Fault Battery voltage fault
- DCV OVP Fault EPS (backup) output overvoltage protection
- Bus Volt Fault Internal DC bus voltage out of range
- and 9 more codes with this action
Record the exact fault, inverter model and time. Do not repeatedly restart the inverter, change settings or open equipment; contact the installer if the condition remains.
Product fit · Family-level · X1-Hybrid G4 Series
Product fit · Family-level · X3-Hybrid G4 Series
- Grid Lost Fault Grid connection lost
- Grid Volt Fault Grid voltage out of range
- Grid Freq Fault Grid frequency out of range
- and 1 more code with this action
Record the displayed fault, time and whether the premises supply appears normal. Do not change the grid profile or operate solar isolators; contact the installer if it repeats.
Product fit · Family-level · X1-Hybrid G4 Series
Product fit · Family-level · X3-Hybrid G4 Series
- Isolation Fault DC insulation resistance too low
- RCD Fault Residual-current fault
- PV Volt Fault PV input voltage out of range
Record the exact fault and weather conditions. Do not reset the inverter, touch PV connectors or operate DC equipment; arrange a licensed inspection if it persists or returns.
Product fit · Family-level · X1-Hybrid G4 Series
Product fit · Family-level · X3-Hybrid G4 Series
- Over Temperature Fault Inverter over temperature (Temp Over Fault)
- Fan Fault / Fan Speed Fault Cooling fan fault or abnormal fan speed
From a safe position, keep the inverter area clear and note direct sun, abnormal heat or visibly blocked airflow. Do not open the enclosure; contact the installer if it remains.
Product fit · Family-level · X1-Hybrid G4 Series
Product fit · Family-level · X3-Hybrid G4 Series
- Overload Fault EPS / backup output overloaded
- EPS OCP Fault Overcurrent in EPS (backup) mode
Note which ordinary backup appliances were operating and reduce demand if safe to do so. Do not operate inverter isolators; contact the installer if the backup output trips again.
Product fit · Family-level · X1-Hybrid G4 Series
Product fit · Family-level · X3-Hybrid G4 Series
This card lists 13 of the 23 SolaX codes that have a reviewed owner action. Owner actions are the reviewed homeowner remedies in the Wattbench SolaX fault library, reviewed 3 August 2026; codes and titles are shown as the library records them. Every code: wattbench.ai/solax-inverter-error-codes
Safety note from the SolaX fault library: owners should record the fault and safely visible conditions. AC/DC isolation, measurements, battery wiring, protection settings and internal work are licensed-worker tasks.
Owner handover card
SolarEdge: when the display shows a code
Fault library: SolarEdge (residential, commercial three-phase, Synergy and TerraMax inverters)
Rows marked brand-level guidance are not confirmed for a particular model.
- Manual cited: SolarEdge Error Codes and Troubleshooting User Guide, Version 1.1, January 2026
If one of these codes appears
- 3xB · Communication No Country Selected
- 3x2 · Communication Software Error
- 3xA · Communication Phase is unbalanced
- and 232 more codes with this action
Record the exact code, inverter model and time. Do not repeatedly restart the inverter, change settings or open equipment; contact your installer if the code remains.
Product fit · Unknown · brand-level guidance
- 3x11 · Communication Arc detection status interrupt
- 2x9 Ground current surge
- 2xA Ground faults may occur due to insufficient insulation to the ground
- and 13 more codes with this action
Treat this as an electrical-safety event. Record the code and conditions, keep clear of the inverter and its wiring, and do not reset the unit or operate isolators; contact your installer promptly.
Product fit · Unknown · brand-level guidance
- WARNING 1 Fan failure
- WARNING 2 Fan failure
- WARNING 3 Fan failure
- and 3 more codes with this action
Record the warning and contact your installer. Do not open the inverter or attempt to inspect, clean or replace the fan yourself.
Product fit · Unknown · brand-level guidance
- 2x2 Night Mode is an inverter status indicating that the input voltage is below 6V DC
- 18x3 Night Mode is an inverter status indicating that the input voltage is below 6V DC
- 8x3 · Commercial Night Mode is an inverter status indicating that the input voltage is below 6V DC
This is a status rather than a fault: the inverter reports its DC input below the operating threshold, which is normal outside daylight. Record it and contact your installer only if it shows when the array should be producing.
Product fit · Unknown · brand-level guidance
- WARNING 5 Menu accessed during production
Record the warning and contact your installer. The action for this one is a control step on the inverter itself, which is an installer task rather than an owner task.
Product fit · Unknown · brand-level guidance
This card lists 13 of the 261 SolarEdge codes that have a reviewed owner action. Owner actions are the reviewed homeowner remedies in the Wattbench SolarEdge fault library, reviewed 26 August 2026; codes and titles are shown as the library records them. Every code: wattbench.ai/solaredge-inverter-error-codes
Safety note from the SolarEdge fault library: owners should record the code and stop at safe visual observations. AC/DC isolation, electrical measurements, wiring, settings changes and opening equipment are licensed-worker tasks; ground-fault and arc codes in particular are shock hazards the guide itself gates behind qualified technicians.
Owner handover card
Deye: when the display shows a code
Fault library: Deye SUN-(5–12)K-SG04LP3-AU hybrid inverter and labelled deployed-firmware residues
Model families documented for these codes: SUN-(5–12)K-SG04LP3-AU
- Manual cited: Deye SUN-(5–12)K-SG04LP3-AU hybrid inverter user manual, Chart 7-1
If one of these codes appears
- F01 DC input polarity reverse fault
- F13 Working mode / grid mode changed
- F21 BUS over-current (Tz_HV_Overcurr_fault)
- and 6 more codes with this action
Record the exact code, model and time. Do not change installer settings, repeatedly restart the inverter or open equipment; contact the installer if the event remains.
Product fit · Family-level · SUN-(5–12)K-SG04LP3-AU
- F15 AC over-current (software)
- F18 AC over-current (hardware)
- F20 DC over-current (hardware)
- and 1 more code with this action
Note which backup or household loads were operating and reduce only ordinary appliance demand if safe to do so. Do not operate inverter isolators; contact the installer if the trip returns.
Product fit · Family-level · SUN-(5–12)K-SG04LP3-AU
- F16 AC leakage current fault
- F23 Transient leakage / GFCI over-current (Tz_GFCI_OC_Fault)
- F24 DC insulation / isolation impedance failure
- and 1 more code with this action
Record the alarm, time and weather conditions. Do not reset the inverter, touch PV cabling or open equipment; arrange a licensed inspection if the alarm persists or returns.
Product fit · Family-level · SUN-(5–12)K-SG04LP3-AU
- F46 Backup battery fault
- F55 DC bus voltage too high
- F56 DC bus voltage too low
- and 1 more code with this action
Record the code and visible battery state in the app. Do not change BMS protocols, voltage limits or battery settings; contact the installer if the alarm does not clear.
Product fit · Family-level · SUN-(5–12)K-SG04LP3-AU
- F42 AC line low voltage
- F47 AC over-frequency
- F48 AC under-frequency
Record the code, time and whether the premises supply appears normal. Do not change the grid profile or protection limits; contact the installer if the event repeats.
Product fit · Family-level · SUN-(5–12)K-SG04LP3-AU
This card lists 15 of the 24 Deye codes that have a reviewed owner action. Owner actions are the reviewed homeowner remedies in the Wattbench Deye fault library, reviewed 3 August 2026; codes and titles are shown as the library records them. Every code: wattbench.ai/deye-inverter-fault-codes
Safety note from the Deye fault library: owners should stop at recording visible app or display information. Isolation, configuration, testing, opening equipment and PV or battery cabling are licensed-electrician work and, where solar accreditation is required, work for an SAA-accredited person.
Owner handover card
Enphase: when the display shows a code
Fault library: Enphase (IQ-series microinverters)
Rows marked brand-level guidance are not confirmed for a particular model.
- Manual cited: Enphase Envoy Communications Gateway installation and operation manual, 141-00014 Rev 04 (legacy product, still published by Enphase)
If one of these codes appears
- AC Voltage Out Of Range Grid voltage too high or too low
No action is needed — the manual states this condition corrects itself once utility voltage returns within limits for several minutes, with the wait restarting if voltage strays again. Record how often it appears and contact the installer if it persists or recurs daily.
Product fit · Unknown · brand-level guidance
- AC Frequency Out Of Range Grid frequency too high or too low
No action is needed — the manual describes these events as usually transient and self-correcting by the electricity network, with the microinverter staying offline until frequency has been in range continuously for a region-set period. Contact the installer if it persists.
Product fit · Unknown · brand-level guidance
- Grid Gone No grid / AC supply detected
In most cases no action is required — the manual attributes this to a power outage, with production resuming when supply returns. Check only whether the PV circuit breakers are visibly ON without operating them; contact the installer if events persist.
Product fit · Unknown · brand-level guidance
- DC Voltage Too Low Not enough DC input from the panel
The manual calls this usually normal during low light and at dawn and dusk. If it does not clear during full daylight, the modules may be heavily shaded or snow-covered — note the pattern and contact the installer; do not go onto the roof.
Product fit · Unknown · brand-level guidance
- DC Power Too Low Panel producing too little power
No action is needed — the manual attributes this to sunrise, sunset, snow cover or very bad weather, with production resuming once sunlight increases. Contact the installer if it persists in good daylight.
Product fit · Unknown · brand-level guidance
This card lists 5 of the 11 Enphase codes that have a reviewed owner action. Owner actions are the reviewed homeowner remedies in the Wattbench Enphase fault library, reviewed 3 August 2026; codes and titles are shown as the library records them. Every code: wattbench.ai/enphase-microinverter-error-codes
Safety note from the Enphase fault library: owners should stay off the roof and stop at app observations. Array, AC and DC work is for a licensed electrician and, where solar accreditation is required, an SAA-accredited person.
Owner handover card
Sigenergy: when the display shows a code
Fault library: Sigenergy (SigenStor)
Model families documented for these codes: SigenStor
- Manual cited: Sigenergy Alarm List Version 05 (2025-10-24), official AU · Revision Version 05
If one of these codes appears
- 1011 Grid overvoltage (Level I / II / III)
- 1012 Grid undervoltage (Level I / II / III)
- 1013 Grid overfrequency (Level I / II / III)
- and 1 more code with this action
Record the alarm, sub-ID and time, then wait for automatic recovery when the grid returns to range. Contact your installer if the alarm persists or repeats; do not change protection settings.
Product fit · Family-level · SigenStor
- 1002 Low insulation resistance (ISO fault)
Record the alarm, sub-ID, time and weather conditions. Keep clear of PV wiring and do not operate isolators; contact your installer if the low-insulation alarm persists or repeats.
Product fit · Family-level · SigenStor
- 1003 Inverter over-temperature
From a safe position, check that external ventilation is not visibly obstructed and note whether the unit is in direct sun. Allow it to cool; do not open the enclosure and contact your installer if it persists.
Product fit · Family-level · SigenStor
- 1006 String input overvoltage (PV)
Leave the SigenStor and PV wiring alone, record the alarm and string sub-ID, and contact your installer promptly. Do not reset the system or operate isolators to test whether it clears.
Product fit · Family-level · SigenStor
- 1009 AFCI fault (DC arc detected)
Treat the arc alarm as urgent: record the string sub-ID, keep clear of the equipment and contact your installer. Do not clear the alarm, operate isolators or touch PV connectors or wiring.
Product fit · Family-level · SigenStor
This card lists 7 of the 13 Sigenergy codes that have a reviewed owner action. Owner actions are the reviewed homeowner remedies in the Wattbench Sigenergy fault library, reviewed 2 August 2026; codes and titles are shown as the library records them. Every code: wattbench.ai/sigenergy-sigenstor-fault-codes
Safety note from the Sigenergy fault library: owners should record the alarm and stop at safe visual observations or ordinary app support. DC/AC isolation, electrical measurements, settings, wiring and opening equipment are licensed-worker tasks completed under the exact product and site procedure.
Owner handover card
Tesla: when the display shows a code
Fault library: Tesla (Powerwall 2 / Powerwall 3 home battery)
Rows marked brand-level guidance are not confirmed for a particular model.
- Manual cited: System Alerts and Notifications | Tesla Support
- Manual cited: Troubleshooting Your Powerwall | Tesla Support
- Manual cited: Best Practices During Power Outages | Tesla Support
If one of these codes appears
- Breaker Open Powerwall breaker is open / off
Record the alert and use Tesla's in-app troubleshooting only when conditions are safe. Do not troubleshoot during an outage, extreme weather or if there is heat damage; if the breaker will not stay closed, contact your installer or Tesla.
Product fit · Unknown · brand-level guidance
- Powerwall Overloaded Powerwall is overloaded: reduce load
Reduce high-power household loads and wait for Powerwall's automatic retry. If it repeatedly overloads with only essential loads running, record the alert and contact your installer.
Product fit · Unknown · brand-level guidance
- Powerwall Inactive Powerwall has stopped powering the home (inactive)
Reduce household load and, when daylight or grid power is available, follow the Tesla app's Powerwall Inactive prompt. Do not restart during unsafe weather or if equipment shows heat damage; contact Tesla support if it remains inactive.
Product fit · Unknown · brand-level guidance
- Powerwall Low on Energy Powerwall is low on energy
Reduce non-essential and high-power household loads to extend backup time. No electrical work is required; Powerwall will continue managing the remaining energy while the grid is unavailable.
Product fit · Unknown · brand-level guidance
- Powerwall Energy Very Low Powerwall energy very low: limited backup remaining
Immediately reduce use to essential loads and allow Powerwall to preserve its remaining energy. Wait for grid return or sufficient solar recharge; do not operate electrical equipment to force a restart.
Product fit · Unknown · brand-level guidance
This card lists 5 of the 11 Tesla codes that have a reviewed owner action. Owner actions are the reviewed homeowner remedies in the Wattbench Tesla fault library, reviewed 2 August 2026; codes and titles are shown as the library records them. Every code: wattbench.ai/tesla-powerwall-alert-codes
Safety note from the Tesla fault library: owners should stop at app guidance, ordinary load reduction and safe observation. Do not troubleshoot during an outage, extreme weather or where there is heat damage. Breakers that will not remain closed, rapid-shutdown circuits, AC/DC isolation, wiring and opening equipment are licensed-worker or Tesla-authorised service tasks.
Owner handover card
FoxESS: when the display shows a code
Fault library: FoxESS (H1/AC1 hybrid inverters and R-series three-phase string inverters)
Model families documented for these codes: H1(G2) Series; AC1(G2) Series; R75 / R100 / R110
- Manual cited: FoxESS H1(G2)/AC1(G2) Series User Manual V1.0.8 (official) · Revision V1.0.8
- Manual cited: FoxESS R-Series (R75/R100/R110) User Manual V1.4 (official) · Revision V1.4
If one of these codes appears
- Bat Volt Fault Battery Voltage Fault
- DCI Fault DCI (DC Injection) Fault
- SW Inv Cur Fault Software Inverter Current Fault
- and 9 more codes with this action
Record the exact alarm, inverter model and time. Do not operate isolators, open equipment or change installer settings; contact your installer if the alarm remains.
Product fit · Confirmed · H1(G2) Series
Product fit · Confirmed · AC1(G2) Series
- 1034 DC Component Current Fault
- 1123 Grid Relay Fault
- 1188 AC SPD Abnormality
- and 3 more codes with this action
Record the exact alarm, inverter model and time. Do not operate isolators, open equipment or change installer settings; contact your installer if the alarm remains.
Product fit · Confirmed · R75 / R100 / R110
- 1040 Grid Voltage Imbalance
- 1042 Grid High Frequency
- 1043 Grid Low Frequency
- and 3 more codes with this action
Record when the alarm occurs and whether the property has normal grid supply. The inverter should reconnect when the grid returns to range; contact your installer if it persists or repeats.
Product fit · Confirmed · R75 / R100 / R110
- Grid Lost Fault Grid Lost Fault
- Grid Volt Fault Grid Voltage Fault
- Grid Freq Fault Grid Frequency Fault
- and 1 more code with this action
Record when the alarm occurs and whether the property has normal grid supply. The inverter should reconnect when the grid returns to range; contact your installer if it persists or repeats.
Product fit · Confirmed · H1(G2) Series
Product fit · Confirmed · AC1(G2) Series
- Iso Fault Isolation (Insulation) Fault
- Res Cur Fault Residual Current Fault
Record the alarm, time and weather conditions. Do not reset the inverter, touch cables or operate isolators; arrange a licensed inspection if it persists or returns.
Product fit · Confirmed · H1(G2) Series
Product fit · Confirmed · AC1(G2) Series
This card lists 14 of the 48 FoxESS codes that have a reviewed owner action. Owner actions are the reviewed homeowner remedies in the Wattbench FoxESS fault library, reviewed 2 August 2026; codes and titles are shown as the library records them. Every code: wattbench.ai/foxess-inverter-error-codes
Owner handover card
Sofar: when the display shows a code
Fault library: Sofar Solar (Shenzhen SOFARSOLAR): legacy ME3000SP retrofit inverter
Model families documented for these codes: ME3000SP
- Manual cited: SOFAR ME3000SP user manual, troubleshooting and Event List
If one of these codes appears
- ID05 BatOVP
- ID09 HW_LLCBus_OVP
- ID10 HW_Boost_OVP
- and 24 more codes with this action
Record the exact code, inverter model and time. Do not repeatedly restart the inverter, operate isolators or open equipment; contact the installer or SOFAR if the event remains.
Product fit · Confirmed · ME3000SP
- ID57 OverTempFault_BAT
- ID58 OverTempFault_HeatSink
- ID59 OverTempFault_Env
- and 5 more codes with this action
From a safe position, keep the equipment area clear and note any obvious heat source or blocked airflow. Do not open equipment or change charge settings; contact the installer if it remains.
Product fit · Confirmed · ME3000SP
- ID01 GridOVP
- ID02 GridUVP
- ID03 GridOFP
- and 2 more codes with this action
Record the code, time and whether the premises supply appears normal. Do not change grid settings; contact the installer if the event persists or repeats.
Product fit · Confirmed · ME3000SP
- ID85 SOC is greater or equal to DOD or Battery voltage is low
- ID86 Bat Voltage Low Shut
- ID103 BatUV
Record the code and allow the battery to recharge under its normal configured mode. Do not alter depth-of-discharge, voltage or charge settings; contact the installer if it recurs.
Product fit · Confirmed · ME3000SP
- ID83 Long dist Load Shedding
- ID84 Long dist Off
Record the remote-control event and system state. Do not override controls or operate isolators; contact the installer if the command is unexpected or does not clear.
Product fit · Confirmed · ME3000SP
This card lists 14 of the 45 Sofar codes that have a reviewed owner action. Owner actions are the reviewed homeowner remedies in the Wattbench Sofar fault library, reviewed 2 August 2026; codes and titles are shown as the library records them. Every code: wattbench.ai/sofar-inverter-error-codes
Safety note from the Sofar fault library: owners should stop at recording the code, app status and safely visible conditions. DC/AC isolation, electrical measurements, opening equipment, firmware work and protection-setting changes are licensed-worker tasks. Any shutdown or restart must follow the procedure for the exact model and site; do not use this library as a switching sequence.
Owner handover card
Hoymiles: when the display shows a code
Fault library: Hoymiles (HM / MI / HMS / HMT-series microinverters and the DTU monitoring gateway)
Model families documented for these codes: HMS-300/350/400/450/500-1T; HMT-1600/1800/2000-4T LA
- Manual cited: Hoymiles HMS-300/350/400/450/500-1T single-phase microinverter user manual
- Manual cited: Hoymiles HMT-1600/1800/2000-4T LA user manual
If one of these codes appears
- 141 Grid overvoltage
- 142 10 min value grid overvoltage
- 143 Grid undervoltage
- and 3 more codes with this action
Record the alarm, time and whether the premises supply appears normal. It may recover when the grid returns to range; do not change grid limits and contact the installer if it repeats.
Product fit · Confirmed · HMS-300/350/400/450/500-1T
Product fit · Confirmed · HMT-1600/1800/2000-4T LA
- 126 Software error code 126
- 128 Software error code 128
- 129 Software error code 129
Record the code and app status. Do not change the grid profile, firmware or device assignment; contact the installer if the alarm is frequent or does not recover.
Product fit · Confirmed · HMT-1600/1800/2000-4T LA
- 147 Power grid outage
- 148 Grid disconnection
- 149 Island detected
Confirm whether the premises has grid supply and record the alarm. Do not operate solar switches or rooftop equipment; contact the installer if normal supply is present but the alarm remains.
Product fit · Confirmed · HMS-300/350/400/450/500-1T
Product fit · Confirmed · HMT-1600/1800/2000-4T LA
- 125 Grid configuration parameter error
- 127 Firmware error
Record the code and app status. Do not change the grid profile, firmware or device assignment; contact the installer if the alarm is frequent or does not recover.
Product fit · Confirmed · HMS-300/350/400/450/500-1T
Product fit · Confirmed · HMT-1600/1800/2000-4T LA
- 121 Over temperature protection
From a safe position, keep the array area unobstructed and record unusual heat or poor airflow. Do not go onto the roof; contact the installer if the alarm remains in normal conditions.
Product fit · Confirmed · HMS-300/350/400/450/500-1T
Product fit · Confirmed · HMT-1600/1800/2000-4T LA
This card lists 12 of the 18 Hoymiles codes that have a reviewed owner action. Owner actions are the reviewed homeowner remedies in the Wattbench Hoymiles fault library, reviewed 3 August 2026; codes and titles are shown as the library records them. Every code: wattbench.ai/hoymiles-microinverter-error-codes
Safety note from the Hoymiles fault library: owners should record the code and app status. AC/DC disconnection, measurements, wiring, connectors and protection settings are qualified-installer tasks.
When to call your installer
- The action for your code says to contact your installer.
- Your code or message is not on this card.
The actions on this card are the only things it asks you to do. Anything beyond them is for your installer or a licensed electrician. Never open the inverter, the battery or any other part of the system.
Installer fills in by hand
- Your installer
- Phone or email
- Model on the equipment label
- Handover date
What to send us
- A photo of the display or app screen
- The code, exactly as shown
- The date and time you saw it
- What was happening at the time
The manufacturer's manual remains the authority for this equipment.