Solar and battery error codes
Inverter and battery codes from the manufacturers’ own manuals, with the few checks a homeowner can safely make — and the codes whose online meanings are wrong.
Code lists by brand
984 solar and battery codes from more than 25 brands' manuals are in the database. Homeowners may read the code, check the AC isolator and consumer-unit breaker are on, check the app and Wi-Fi, and restart the way the manual allows — never open enclosures or touch DC wiring.
Is the Anker Solarbank a plug-in solar device under the new UK rules?
No. Solarbank units contain batteries, and the UK Solarbank 4 E5000 Pro can charge from the grid at 2,500 W, so they are outside the GB plug-in…
Read the answer →02What does a flashing red power button on my Anker Solarbank mean?
On an Anker SOLIX Solarbank a flashing red power-button light signals a malfunction or warning. Anker's manual gives no code table, so open the…
Read the answer →03Is a BLUETTI power station with solar panels 'plug-in solar'?
No. A portable power station such as the BLUETTI AC180 is a battery that powers appliances from its own sockets; it does not feed your home…
Read the answer →04My EcoFlow STREAM light is red - what does it mean?
A red light on an EcoFlow STREAM Ultra, AC Pro or STREAM Microinverter means the device has detected a fault. EcoFlow does not print error codes…
Read the answer →05Can I just plug in an EcoFlow STREAM kit in the UK?
Since 27 August 2026 GB law allows plug-in solar only for solar-only devices up to 800 W AC that are not designed to store imported electricity.…
Read the answer →06My EcoFlow device shows offline in the app - is it broken?
An EcoFlow STREAM or PowerOcean unit showing offline usually has lost Wi-Fi or cloud connection rather than stopped working. Check the device's…
Read the answer →07Why do my Enphase micros report 'AC Voltage Out Of Range' on sunny afternoons?
Enphase 'AC Voltage Out Of Range' means the microinverters saw grid voltage outside their permitted range and stopped exporting until it…
Read the answer →08Why is one Enphase microinverter showing a solid red light?
A solid red status LED on an Enphase IQ8 means 'DC Resistance Low - Power Off': insulation between the panel wiring and earth fell below about 7…
Read the answer →09What does 'DC Voltage Too Low' mean in the Enphase app?
Enphase 'DC Voltage Too Low' means a microinverter is getting too little voltage from its panel. It's normal at dawn, dusk and in dull spells. If…
Read the answer →10My Enphase app says the gateway is not reporting - what should I do?
'Not reporting' usually means the IQ Gateway (Envoy) has lost internet, not that the panels stopped. Check the gateway's network LED (solid green…
Read the answer →11Where do I find error codes on a Fronius GEN24 Plus?
Fronius GEN24 and GEN24 Plus inverters show four-digit status codes in Solar.web under Service Messages and in the inverter's web interface Event…
Read the answer →12Why does my Fronius show State 306 or 307 in the morning?
Fronius State 306 (low PV output) and 307 (low PV voltage) mean there isn't enough power or voltage from the panels to feed the grid. Fronius says…
Read the answer →13What does Fronius State 509 'No energy fed in for 24 hours' mean?
Fronius State 509 means the inverter hasn't fed any energy into the grid in the past 24 hours. Snow, dirt or a long dull spell are typical causes.…
Read the answer →14What do Fronius state codes 102, 103 and 107 mean?
Fronius class 1 codes come from the public grid, not the inverter: 102 means AC voltage too high, 103 too low, 105 and 106 frequency out of range,…
Read the answer →15What do Fronius codes 475 and 502 insulation fault mean?
Fronius codes 447 and 475 (insulation fault between the panels and earth) stop feed-in, while 502 is a warning that insulation on the solar…
Read the answer →16My GoodWe inverter's FAULT light is on - how do I read the error?
On GoodWe ET, ET Plus+ and BT inverters, a steady FAULT LED means a fault has occurred; a FAULT LED blinking once means the backup output is…
Read the answer →17What does GoodWe 'Isolation Failure' or 'ISO failure' mean?
GoodWe 'Isolation Failure' means insulation resistance between the solar DC wiring and earth is too low, often due to damaged cable insulation, a…
Read the answer →18What does GoodWe error 13 Over Temperature mean?
GoodWe error 13 'Over Temperature' means the inverter has been too hot for too long, usually because of high surrounding temperature, poor airflow…
Read the answer →19What does 'Utility Loss' mean on my GoodWe inverter?
GoodWe 'Utility Loss' means the inverter can't detect the grid: a power cut, a tripped AC breaker or loose AC connection. It clears automatically…
Read the answer →20How do I read Lux Power E and W codes?
Lux Power hybrids show E codes (faults that stop the inverter) and W codes (warnings) on the LCD and in the LuxPower monitoring app. Grid warnings…
Read the answer →21What does SMA Event 3501 'Insulation failure' mean on my Sunny Boy?
SMA Event 3501 means the inverter has detected an earth (ground) fault in the solar panel wiring, so it stops feeding in. Don't touch the panels,…
Read the answer →22Why does my SMA inverter say 'Waiting for DC start conditions'?
SMA Events 3901 and 3902 mean the panels are not yet producing enough voltage for the inverter to start feeding in. It is normal at dawn, dusk and…
Read the answer →23Why does my SMA inverter keep showing 'Grid incident'?
SMA 'Grid incident' events mean grid voltage or frequency went outside the permitted limits, so the inverter disconnected: 101-105 and 301 for…
Read the answer →24What do SMA Event 6501 overtemperature and 8003 temperature derating mean?
SMA Event 6501 means the inverter switched off because it got too hot; Event 8003 means it reduced power for more than ten minutes because of…
Read the answer →25My SMA inverter has a red light - how do I find the error?
A red LED on an SMA Sunny Boy means an event has occurred. Open the SMA Energy app, Sunny Portal (ennexOS) or the inverter's web interface to read…
Read the answer →26What do Sofar ID01 GridOVP and ID03 GridOFP mean?
On a SOFAR HYD-ES, ID01 GridOVP means grid voltage too high, ID02 too low, ID03 GridOFP frequency too high and ID04 too low. If occasional, the…
Read the answer →27What does Sofar ID56 PvIsoFault mean?
SOFAR ID56 PvIsoFault (ID042 IsoFault on HYD-EP models) means insulation resistance between the solar panels and earth is too low, usually from…
Read the answer →28Can I reset a Sofar hybrid inverter myself?
For many SOFAR internal faults (for example HYD-ES ID09-ID12 and ID17-ID26), the manual's remedy is to switch the inverter off, wait five minutes…
Read the answer →29What does a Victron SmartSolar 'Err' code mean?
Victron SmartSolar and BlueSolar chargers show 'Err' numbers in VictronConnect and VRM. Many reset themselves: Err 1 battery hot, Err 2 battery…
Read the answer →30What do the yellow and red lights on a Zendure SolarFlow Hyper 2000 mean?
On the Zendure Hyper 2000, yellow lights mean something is disconnected: left solid, low battery and not charging; left blinking, battery not…
Read the answer →31Can a Zendure SolarFlow be used as plug-in solar in Great Britain?
Not under the plug-in route. SolarFlow systems include batteries, and models such as the Hyper 2000 and 2400 AC can charge from the grid, so they…
Read the answer →32What do eddi fault codes (4)1 to (4)8 mean?
eddi fault codes point to the immersion side: (4)1 heater load above 16 A, (4)2 overheating, (4)3 no signal from the harvi, (4)4 grid sensor…
Read the answer →33What does 'Grid Lost Fault' mean on my Fox ESS inverter?
It means the Fox ESS inverter can no longer see mains power, usually because of a power cut or because its AC isolator or consumer-unit breaker is…
Read the answer →34Why does my Fox ESS inverter show Grid Volt Fault or 10min Volt Fault on sunny days?
Both mean mains voltage went outside the limits the inverter must obey under UK grid rules; 10min Volt Fault uses a ten-minute average. Fox says…
Read the answer →35What is an Iso Fault on a Fox ESS inverter and is it dangerous?
Iso Fault means the inverter measured low insulation between the solar panel wiring and earth, often from water ingress or damaged cable. It will…
Read the answer →36Can I reset a Fox ESS inverter fault myself?
Only in a limited way. Many Fox ESS alarms say 'Disconnect PV, grid and battery, then reconnect', which means isolating DC and battery circuits -…
Read the answer →37What does Growatt Error 200 mean?
Error 200 is an arc-fault (AFCI) trip: the inverter has detected an electric arc in the solar wiring. Growatt says it then shuts down permanently.…
Read the answer →38What does Growatt Error 203 'PV Isolation Low' mean?
Error 203 means low insulation resistance between the PV wiring and earth. Growatt's MIN manual gives a threshold of more than 25 kΩ, or 500 kΩ…
Read the answer →39What does Growatt Error 302 'No AC Connection' mean?
Error 302 means the Growatt inverter cannot see the grid. The usual causes are a power cut, a tripped or switched-off AC breaker or isolator, or…
Read the answer →40What is Huawei alarm 2032 Grid Loss / Grid Failure?
Alarm 2032 means the SUN2000 inverter lost the mains grid: a power cut, or the AC circuit disconnected or its breaker switched off. It is a major…
Read the answer →41Why does my Huawei inverter show 2034 Grid Overvoltage?
2034 means mains voltage was above the inverter's protection threshold, so it disconnected. Occasional alarms recover automatically. If frequent,…
Read the answer →42Huawei alarm 2062 Low Insulation Resistance - is my system unsafe?
Alarm 2062 means the inverter measured a short or poor insulation between the PV array and earth, often from damp or damaged cabling. The inverter…
Read the answer →43Huawei 2064 Device Fault - can it be fixed?
2064 is an unrecoverable internal circuit fault (cause IDs 1-12 cover boost, control, residual-current sensor, EEPROM, relay and DC bus faults).…
Read the answer →44What do Jackery SolarVault fault codes F0 to E7 mean?
The SolarVault 3 manual lists codes F0, F1, F2 and E1 to E7 with fixes but no fault names. F0 points to temperature or low charge. F1 to E5 just…
Read the answer →45Why does my zappi, eddi or libbi say 'Grid CT Lost'?
'Grid CT Lost' means the device has lost its reading of power at your meter, usually because the wireless harvi dropped out. Charging or diverting…
Read the answer →46Why won't my myenergi device connect to Wi-Fi or appear in the app?
myenergi devices only use 2.4 GHz Wi-Fi. Check the device's time, date and time zone, the router's 2.4 GHz band, signal strength at the device and…
Read the answer →47My zappi or eddi says 'Bad Voltage Range' on sunny days - why?
myenergi devices warn when supply voltage leaves the allowed range; myenergi uses 253 V as the upper limit. On sunny days solar export can raise…
Read the answer →48What does SolarEdge error 3x9A mean?
In SolarEdge's own January 2026 error list, 3x9A means the inverter has locked itself, either manually or because a safety feature tripped. It is…
Read the answer →49Why does my SolarEdge inverter keep switching off with 'AC voltage too high' on sunny days?
Codes such as 2x1F, 2x21 or 18x1F mean the grid voltage measured at the inverter is above the UK limit it has been set to. On sunny middays,…
Read the answer →50Why does my SolarEdge inverter show an isolation fault in the morning?
At each start-up, a SolarEdge inverter checks the insulation between the panels' wiring and earth. It trips if the reading falls below 600 kΩ on…
Read the answer →51What does SolarEdge error 3x6E (Energy Meter comm error) mean?
3x6E means the inverter has lost communication with the SolarEdge Energy Meter. Without that meter, it cannot measure consumption, enforce an…
Read the answer →52Which SolarEdge errors clear themselves and which need an engineer?
SolarEdge grid-voltage, grid-frequency and grid-down codes (2x1F, 2x20, 2x28 and 18x40 upwards) clear once the grid is back within limits. Night…
Read the answer →53What does SolaX IE 13 Isolation Fault mean?
IE 13 on an X1-Hybrid G4, or IE:00020 IsoFault on an X1-Mini or Boost G4, means the inverter has measured low insulation between the solar wiring…
Read the answer →54Why is my SolaX Pocket WiFi dongle flashing red?
On the Pocket WiFi V4, a flashing red light means the dongle can't talk to the inverter. A steady red light means it can't join your router.…
Read the answer →55Which SolaX errors can I reset myself?
On an X1-Hybrid G4, grid codes (IE 02, 03, 04, 08) clear themselves once the grid is normal. For overloads such as IE 16 or IE 17, the manual lets…
Read the answer →56What is 'State 2 excursion' on a Solis inverter?
It is a UK export-limitation alarm under ENA G100: exported current exceeded the configured backflow limit. G100 requires a manual reset, which…
Read the answer →57My Solis inverter says NO-Grid - what does that mean?
NO-Grid means the Solis inverter cannot detect mains voltage, so it has stopped generating. The usual causes are a power cut or the inverter's AC…
Read the answer →58Why does my Solis inverter keep showing OV-G-V01 (grid over voltage)?
OV-G-V01 means mains voltage exceeded the inverter's upper limit, so it disconnected. Occasional events clear automatically. If it happens often…
Read the answer →59Solis PV ISO-PRO01 fault in the morning - what should I do?
PV ISO-PRO01/02 means the inverter detected low insulation between the panel wiring and earth. Solis says if it only happens on rainy days or…
Read the answer →60Are Sunsynk and Deye inverter error codes the same?
Yes, broadly. Sunsynk hybrids are built on Deye hardware, and Deye's SUN-SG04LP1-EU manual (April 2026) uses the same F-code numbers and meanings…
Read the answer →61What is F13 on a Sunsynk inverter?
F13 means the working mode changed: the grid type or frequency changed, the battery was set to 'No battery', or older firmware logged a work-mode…
Read the answer →62What do Sunsynk codes F35, F42, F43, F47 and F48 mean?
They are grid protection codes: F35 no grid (power cut or tripped supply), F42/F44 low voltage, F43 high voltage, F47 over-frequency and F48…
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