All Inverter Error Codes
138 diagnostic articles across 11 manufacturers — each one verified against the manufacturer's own documentation.
Deye
9 codes
Deye Inverter Error F02/F24 — DC Insulation Impedance Fault Explained
F02 and F24 both mean your Deye inverter measured dangerously low insulation resistance between…
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Deye Inverter Error F15 — Is It Serious? How to Respond
Error F15 on a Deye inverter is an “AC firmware over current” fault —…
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Deye Inverter Error F29 — Parallel CAN Bus Fault Explained
F29 (Parallel_CANBus_Fault) appears on Deye hybrid inverters running in parallel — two or more…
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Deye Inverter Error F35 — No AC Grid Detected
F35 means your Deye inverter cannot detect the AC grid — “no AC grid”…
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Deye Inverter F05/F06 — EEPROM Memory Errors Explained
F05 and F06 are internal memory faults: your Deye inverter failed to read (F05)…
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Deye Inverter F20 — DC Overcurrent Fault, Causes and Safe Fixes
F20 is a hardware-level DC overcurrent fault: your Deye inverter measured more current on…
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Deye Inverter F26 — What a DC Busbar Unbalance Fault Means
F26 means the DC busbar inside your Deye inverter is unbalanced — the internal…
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Deye Inverter F56 — DC Busbar Voltage Too Low at Startup?
F56 means the DC busbar voltage inside your Deye inverter is too low. Deye’s…
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Deye Inverter Warning W31 — Is Your Battery Still Talking to It?
W31 (Battery_comm_warn) is a warning — not a shutdown fault — telling you that…
Read diagnosis →Fronius
22 codes
Fronius Inverter Code 223 — Undervoltage on L2 Explained
Fronius code 223 means "Undervoltage at L2-N": the inverter measured the voltage between line…
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Fronius Inverter Code 240 — What an Arc Detection Warning Means
Code 240 means your Fronius inverter's arc detector found an electric arc in the…
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Fronius Inverter Code 241 — Arc Detected, and What Happens Next
Code 241 on a Fronius Symo, Primo, or Galvo means ArcContinuousFault: the inverter's arc-fault…
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Fronius Inverter Code 314 — Current Sensor Calibration Timed Out
Code 314 means your Fronius inverter's routine calibration of its current sensors didn't finish…
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Fronius Inverter Code 479 — The Intermediate Circuit Relay Switched Off
Code 479 means the protection relay on your Fronius inverter's intermediate (DC-link) circuit opened…
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Fronius Inverter STATE 102 — What Does It Mean? A Plain-English Guide
STATE 102 means the AC grid voltage is too high. The inverter has disconnected…
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Fronius Inverter STATE 103 — Should You Worry?
STATE 103 means the AC grid voltage is too low. The inverter has disconnected…
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Fronius Inverter STATE 105 — Is Your Grid Frequency Too High?
STATE 105 means your Fronius inverter measured AC grid frequency above its permitted limit…
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Fronius Inverter STATE 106 — Should You Worry?
STATE 106 means the grid frequency dropped too low, so your inverter briefly disconnected…
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Fronius Inverter STATE 107 — What It Means and When to Worry
STATE 107 means the inverter cannot detect the AC grid — it is waiting…
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Fronius Inverter STATE 108 — What Does It Mean? A Plain-English Guide
STATE 108 means the inverter detected stand-alone (islanded) operation — it believes the grid…
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Fronius Inverter STATE 301 — What an AC Overcurrent Means
STATE 301 means your Fronius inverter detected an overcurrent on its AC output and…
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Fronius Inverter STATE 306 — Normal Behavior or a Real Problem?
STATE 306 (LOW PV POWER) means there is not enough sunlight for the inverter…
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Fronius Inverter STATE 307 — What It Means and When to Worry
STATE 307 (DC LOW) means the DC voltage from your panels is too low…
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Fronius Inverter STATE 309 — What It Means & What to Check
STATE 309 means the DC input voltage on MPPT 1 is too high —…
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Fronius Inverter STATE 447 — A Homeowner’s Troubleshooting Guide
STATE 447 is an insulation-fault warning: the inverter's self-diagnosis found that electrical insulation is…
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Fronius Inverter STATE 457 — What to Do Next
STATE 457 means your Fronius inverter's internal grid relay may be sticking, or the…
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Fronius Inverter STATE 461 — What a DSP Memory Fault Means
STATE 461 means your Fronius inverter has detected a fault in the data memory…
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Fronius Inverter STATE 475 — Causes and Safe Fixes
STATE 475 means your Fronius inverter has detected a ground fault on the solar…
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Fronius Inverter STATE 502 — Practical Steps to Fix It Safely
STATE 502 means your Fronius inverter has detected an insulation fault in the solar…
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Fronius Inverter STATE 517 — Why It Happens and How to Respond
STATE 517 means the inverter is derating — deliberately reducing its power output because…
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Fronius Inverter STATE 567 — Normal Behavior or a Real Problem?
STATE 567 is informational: Grid Voltage Dependent Power Reduction — volt-watt mode — is…
Read diagnosis →GoodWe
11 codes
GoodWe Inverter Error 14 — What It Means & What to Check
GoodWe error 14 (“Isolation Fail”) means the inverter measured the insulation resistance between your…
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GoodWe Inverter Error 14 Isolation Fail — Low Insulation Resistance
Error 14 on a GoodWe inverter means "Isolation Fail": the inverter measured the insulation…
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GoodWe Inverter Error 15 — Causes and Safe Fixes
GoodWe error 15 (“Vac Failure”) means the voltage coming from your electricity grid is…
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GoodWe Inverter Error 15 Vac Failure — Grid Voltage Out of Range
Error 15 on a GoodWe inverter means "Vac Failure": the AC voltage from your…
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GoodWe Inverter Error 16 — External Fan Fault and How to Respond
Error 16 — 'EFan Fault' — means the external cooling fan on your GoodWe…
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GoodWe Inverter Error 17 — A Homeowner’s Troubleshooting Guide
GoodWe error 17 (“PV Over Voltage”) means the voltage from your solar panels is…
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GoodWe Inverter Error 21 — What to Do Next
GoodWe error 21 (“DC Bus High”) means the voltage on the inverter's internal DC…
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GoodWe Inverter Error 23 — Utility Loss and How to Respond
GoodWe error 23 (“Utility Loss”) means your inverter cannot detect the electricity grid —…
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GoodWe Inverter Error 30 — What the 1.5V Reference Fault Means
Error 30 means the inverter's internal 1.5V reference voltage circuit has failed — GoodWe's…
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GoodWe Inverter Error 7 and 25 — Relay Check Failure Explained
Errors 7 and 25 both mean 'Relay Check Failure' — the inverter's self-test of…
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GoodWe Inverter Errors 18 and 19 — Overheating Causes and Cures
Errors 18 ('Temperature Too High') and 19 ('Over Temperature') are GoodWe's thermal protection codes:…
Read diagnosis →Growatt
21 codes
Growatt AC V Outrange — What to Do Next
AC V Outrange means the grid voltage is outside the range your inverter may…
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Growatt Ground I Fault — What It Means and When to Call an Electrician
Ground I Fault means the inverter measured excessive current on the earth (ground) path…
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Growatt Inverter 405 — Is a Relay Fault Serious?
Error 405 means your Growatt inverter's internal grid relay has failed — the relay…
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Growatt Inverter AC F Outrange — A Plain-English Frequency Guide
AC F Outrange means the utility grid’s frequency has moved outside the range your…
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Growatt Inverter Auto Test Failed — Why It Happens and What to Do
If your Growatt shows “Auto Test Failed” (Error 407), the inverter’s Italy-only protection self-test…
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Growatt Inverter Error 04 — Low Battery Voltage, Causes and Safe Steps
Error 04 on a Growatt SPF off-grid inverter means the battery voltage has fallen…
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Growatt Inverter Error 100 — A Homeowner’s Troubleshooting Guide
Error 100 means the inverter's internal 2.5-volt reference — the baseline every measurement is…
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Growatt Inverter Error 101 — Why It Happens and How to Respond
Error 101 means the inverter's slave processor has stopped receiving data from the master…
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Growatt Inverter Error 102 — Causes and Safe Fixes
Error 102 means your Growatt's two internal processors recorded measurements that don't match —…
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Growatt Inverter Error 116 — What It Means & What to Check
Error 116 means the inverter failed while reading from or writing to its EEPROM…
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Growatt Inverter Error 117 — What to Do Next
Error 117 means the inverter's self-test found a fault in its relay circuit —…
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Growatt Inverter Error 119 — Is It Dangerous? What to Do Immediately
Error 119 means the inverter's self-test found a possible fault in its internal GFCI…
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Growatt Inverter Error 121 — Practical Steps to Fix It Safely
Error 121 means the inverter's master processor has stopped receiving data from the slave…
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Growatt Inverter Error 122 — Causes and Safe Fixes
Error 122 means the inverter's DC bus voltage left its permitted range — often…
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Growatt Inverter Error 19 Battery Disconnected and How to Fix It
Error 19 on Growatt SPF-series off-grid and hybrid inverters means the battery is disconnected…
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Growatt Inverter Error 411 — When DSP and M3 Boards Stop Talking
Error 411 (“DSP communicates with M3 abnormal”) means the two internal processors in your…
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Growatt Inverter Error 58 — Is Low Output Voltage Dangerous?
Error 58 on a Growatt SPF off-grid inverter means the AC output voltage has…
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Growatt Inverter No AC Connection — Grid Failure or a Tripped Breaker?
No AC Connection means your Growatt inverter cannot detect the utility grid, so it…
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Growatt PV Isolation Low — What It Means and When to Call an Electrician
PV Isolation Low means the insulation resistance between your panels and earth has fallen…
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Growatt PV Voltage High — Urgent Causes and What to Do Now
PV Voltage High means your panels are delivering more DC voltage than the inverter's…
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Growatt Residual I High — Is It Dangerous? What to Do Immediately
Residual I High means the inverter detected leakage current to earth above the safe…
Read diagnosis →Huawei
12 codes
Huawei Inverter AFCI 3003 — When the Arc-Fault Alarm Trips
Your Huawei SUN2000 has detected an electric arc somewhere in the DC wiring between…
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Huawei Inverter Alarm 2034 — Grid Overvoltage and HVRT Explained
Alarm 2034 means the grid voltage rose above the upper threshold — or stayed…
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Huawei Inverter Alarm 2035 — What Causes Unbalanced Grid Voltage?
Alarm 2035 means the difference between your three grid phase voltages has exceeded the…
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Huawei Inverter Alarm 2039 — Why Output Overcurrent Trips
Alarm 2039 means the inverter's transient output current exceeded its protection threshold — typically…
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Huawei Inverter Alarm 2051 — Abnormal Residual Current Explained
Alarm 2051 means your Huawei SUN2000 detected abnormal residual current — small amounts of…
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Huawei Inverter Alarm 2061 — Why Your Grounding Alarm Tripped
Alarm 2061 means your Huawei SUN2000 found a problem with its grounding — typically…
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Huawei Inverter Alarm 2062 — Is Low Insulation Resistance Dangerous?
Alarm 2062 means the insulation resistance between your PV array and ground has dropped…
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Huawei Inverter Alarm 2063 — Overtemperature and How to Respond
Alarm 2063 means the inverter cabinet has gotten too hot. Huawei lists three possible…
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Huawei Inverter Alarm 2068 — Battery Abnormal and How to Clear It
Alarm 2068 on your Huawei SUN2000 means there is a problem with the connected…
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Huawei Inverter Alarm 2069 — Battery Reverse Connection Explained
Alarm 2069 on a Huawei SUN2000 means the inverter has detected that the battery…
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Huawei Inverter Alarm 2070 — Active Islanding Detection Explained
Alarm 2070 is Huawei's “Active Islanding” alarm — a Major-severity alarm meaning your SUN2000…
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Huawei Inverter Alarms 2036 and 2037 When Grid Frequency Trips
Huawei alarm 2036 (grid overfrequency) and 2037 (grid underfrequency) mean the actual grid frequency…
Read diagnosis →SAJ
1 codes
SMA
11 codes
SMA Inverter Arc Fault — The Tap-Twice Reset Explained
When your SMA Sunny Boy detects an electric arc in the DC wiring, it…
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SMA Inverter Code 1302 — When the Grid Voltage Never Arrives
Event 1302 means your SMA inverter can't detect any grid voltage at all —…
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SMA Inverter Event 101/102/103 — Grid Fault and What It Means for You
Events 101, 102, and 103 on your SMA inverter all mean the same thing:…
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SMA Inverter Event 3501/3503 — Ground Fault Found, What to Do Next
Events 3501 and 3503 mean your SMA inverter has detected a ground fault in…
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SMA Inverter Event 401 — Why the Inverter Left the Grid
Event 401 is SMA's 'Grid incident' message: your inverter disconnected from the utility grid…
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SMA Inverter Event 4301 — When Your AFCI Detects an Electric Arc
Event 4301 means your SMA inverter's arc fault circuit interrupter (AFCI) detected an electric…
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SMA Inverter Event 801 — Stuck Waiting for Grid Voltage
Event 801 — “Waiting for grid voltage” — means your SMA Sunny Boy cannot…
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SMA Inverter Event 8206 — Electric Arc Detected and What to Do Next
Event 8206 means your SMA inverter's arc-fault protection detected an electric arc in the…
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SMA Inverter Events 202, 203 and 205 — Grid Gone or Grid Too Low?
Events 202, 203, and 205 all share one message — 'grid incident': the utility…
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SMA Inverter Fac-Bfr or Fac-Srr — What the Grid Frequency Error Means
Fac-Bfr or Fac-Srr means the AC grid frequency is outside the allowable range. Your…
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SMA Inverter K1 Open Error — Does the Inverter Need Replacing?
The 'K1 Open' message means your SMA inverter's self-test found a problem with its…
Read diagnosis →Sol-Ark
1 codes
SolarEdge
18 codes
SolarEdge Inverter 18X37 V-Line Max — Why Your Inverter Tripped
Error 18X37 (“V-Line Max”) means your single-phase SolarEdge inverter measured AC line voltage above…
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SolarEdge Inverter 18XA6 Hardware Fault — What It Means for You
Error 18xA6 is an internal hardware fault on single-phase SolarEdge inverters — on the…
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SolarEdge Inverter 2X19 Isolation Fault — Meaning and Safe Next Steps
Error 2X19 means your SolarEdge single-phase inverter has detected an isolation fault — the…
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SolarEdge Inverter 64 — What This Grid Fault Code Means
Error 64 on a SolarEdge inverter is a grid-protection shutdown, and its exact meaning…
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SolarEdge Inverter 8X19–8X1B AC Voltage Too High on Lines 1–3
SolarEdge codes 8X19, 8X1A, and 8X1B mean "AC Voltage Too High" on line 1,…
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SolarEdge Inverter Error 18XA6 — Practical Steps to Fix It Safely
Your inverter's built-in self-check found an internal hardware fault, so it has stopped producing…
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SolarEdge Inverter Error 2X13 — Practical Steps to Fix It Safely
SW Error is an internal software fault in your SolarEdge inverter — it appears…
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SolarEdge Inverter Error 33 — What AC Voltage Too High Means
Error 33 on a single-phase SolarEdge inverter means AC voltage too high: the grid…
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SolarEdge Inverter Error 36 — DC Injection Fault Explained
Error 36 on a SolarEdge inverter means DC Injection: the inverter detected direct current…
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SolarEdge Inverter Error 8X10 — What It Means & What to Check
The inverter's internal processor lost contact with its own sub-components, so it stopped producing…
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SolarEdge Inverter Error 8X19 — Causes and Safe Fixes
The grid voltage on the indicated line rose above your country's permitted limit, so…
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SolarEdge Inverter Error 8X1C — Why It Happens and How to Respond
The grid voltage on the indicated line dropped below the permitted minimum, so your…
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SolarEdge Inverter Error 8X2B — Is It Dangerous? What to Do Immediately
Your inverter's residual current device measured leakage current from the DC side to earth…
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SolarEdge Inverter Error 8X52 — Causes and Safe Fixes
Unbalanced DC Voltage (code 8x52) means the inverter detected abnormal voltage imbalance on the…
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SolarEdge Inverter Error 8X58 — When to Call an Electrician
The insulation resistance between your PV array and earth dropped below the safe limit…
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SolarEdge Inverter Fan Failure — Why the Fan Stops and What to Do
One of your inverter's cooling fans has stopped working. This is a warning rather…
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SolarEdge Inverter Meter Communication Fault — 3X6E Guide
The meter communication fault — shown as Error 3x6E on newer firmware and Error…
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SolarEdge Inverter Temperature Too High — Why It Overheats
Your inverter ran hotter than its safe operating limit and protected itself — it…
Read diagnosis →Solis
21 codes
Solis Inverter AFCI Check Fault — Why the Self-Test Failed
AFCI Check FAULT means your Solis inverter’s arc-fault detection module failed its startup self-test.…
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Solis Inverter ARC-FAULT Error — Is It Dangerous? What to Do Immediately
An electric arc has been detected in the DC wiring by your Solis inverter's…
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Solis Inverter CAN Fail Alarm — Restoring Lost Battery Communication
“CAN Fail” on your Solis hybrid inverter means the CAN-bus communication link between the…
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Solis Inverter DCinj-Fault — High DC Injection Explained
DCinj-FAULT means your Solis inverter measured too much DC current leaking into its AC…
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Solis Inverter G-IMP Error — A Homeowner’s Troubleshooting Guide
The grid connection looks too “soft” — high impedance — for your Solis inverter…
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Solis Inverter GRID-INTF Error — What It Means & What to Check
Your Solis inverter detected interference on the grid connection and disconnected as a precaution.…
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Solis Inverter Ground-Fault — What the 1033H Alarm Means for You
When your Solis shows a GROUND-FAULT alarm (code 1033H), it has detected current leaking…
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Solis Inverter GROUND-FAULT Error — When to Call an Electrician
Your Solis inverter found a ground fault — part of the PV system is…
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Solis Inverter IGBT-OV-I Error — Causes and Safe Steps
IGBT-OV-I means your Solis inverter detected overcurrent in its IGBTs — the power transistors…
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Solis Inverter ILEAK-FAULT Error — Is It Dangerous?
Your Solis inverter measured excessive leakage current on the grid (AC) side and shut…
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Solis Inverter ILeak-Pro and ILeak-Fault — Leakage Current Alarms
Solis inverters raise two related leakage-current alarms. ILeak-PRO 01–04 means the leakage-current protection has…
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Solis Inverter ILEAK-PRO Error — Urgent Causes and What to Do Now
Your Solis inverter detected leakage current — electricity escaping where it should not —…
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Solis Inverter NO-Battery — Battery Not Detected, What to Do
NO-Battery means your Solis hybrid inverter cannot detect a battery. On a hybrid system…
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Solis Inverter NO-GRID Error — Why It Happens and How to Respond
No grid voltage is reaching your Solis inverter, so it has shut down its…
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Solis Inverter OV-BUS Error — Why It Happens and How to Respond
Your Solis inverter's internal DC bus voltage went too high (OV-BUS) or too low…
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Solis Inverter OV-DC Error — What It Means & What to Check
Your panel strings are producing more DC voltage than your Solis inverter can accept.…
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Solis Inverter OV-G-F Error — Causes and Safe Fixes
The grid frequency rose above your Solis inverter's limit, so it disconnected to stay…
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Solis Inverter OV-G-V Error — A Homeowner’s Troubleshooting Guide
Your Solis inverter measured grid voltage above its safe limit and stopped feeding power…
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Solis Inverter OV-TEM Error — What to Do Next
Your Solis inverter is overheating and has cut output or shut down to protect…
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Solis Inverter UN-G-F Error — Grid Frequency Too Low
UN-G-F means the utility grid’s frequency dropped below your inverter’s protection limit, so the…
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Solis Inverter UN-G-V Error — Practical Steps to Fix It Safely
Grid voltage fell below your Solis inverter's safe limit, so it disconnected. This is…
Read diagnosis →Sungrow
11 codes
Sungrow Inverter Code 002 — What Does It Mean? A Plain-English Guide
Sungrow fault code 002 means grid overvoltage — the voltage from your electricity network…
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Sungrow Inverter Code 003 — Why Transient Overvoltage Stops Feed-In
Code 003 means your Sungrow inverter detected a brief spike in grid voltage above…
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Sungrow Inverter Code 010 — Islanding Explained for Homeowners
Sungrow fault code 010 means “Islanding” — the inverter has detected that grid power…
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Sungrow Inverter Code 036 — Why Your Radiator Is Overheating
Code 036 means the inverter's power module — the IGBT assembly bolted to the…
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Sungrow Inverter Code 070 — Is a Defective Fan Stopping Output?
Code 070 means one or more of the inverter's cooling fans are defective —…
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Sungrow Inverter Code 088 — What the Arc Fault Warning Means
Code 088 is Sungrow's “Arcing warning” — the inverter's arc-fault (AFCI) protection has detected…
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Sungrow Inverter Code 100 — What the Hardware Overcurrent Fault Means
Code 100 is an inverter overcurrent hardware fault — the current inside your Sungrow…
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Sungrow Inverter Code 202 — PV Hardware Overcurrent Fault
Sungrow code 202 means "PV hardware overcurrent fault": the current coming in from your…
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Sungrow Inverter Codes 004 and 005 — Grid Undervoltage Explained
Codes 004 and 005 both mean grid undervoltage — the AC voltage from the…
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Sungrow Inverter Error Code 014 — 10-Minute Grid Overvoltage Explained
Code 014 means the 10-minute average voltage from your electricity grid stayed above the…
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Sungrow Inverter Error Code 038 — Is Your Grid-Side Relay Faulty?
Code 038 means your Sungrow inverter's self-check found a problem with the relay on…
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