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Fault code index · SolarEdge inverter & power optimisers

SolarEdge Fault Code Index

Every SolarEdge fault code from SetApp and the monitoring portal — what it means, the most likely cause, and what to do. Find your code in the index below or use the category sections to browse by system area.
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Adam Miller · Jun 2026 Google

I can’t praise this firm enough. After hearing my solar panels rattling in very windy conditions, I contacted Solar Tech (as my installers no longer trade). Ronald was fantastic at explaining what he thought the issue was likely to be. Communication was great throughout keeping me fully updated. The team worked really hard on the day to carry out the necessary work. I can now sleep soundly at night without worrying about the solar panels on my roof. I would thoroughly recommend this firm. Thank you for sorting the problem out.

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Ron was brilliant. He really tried to help. He spent hours trying to fix our GivEnergy AIO and ultimately it became apparent that it needed parts to fix the BMS management system. As there appears to be no replacement parts available on the market, he gave excellent advice on what options are now available to move forward. He is incredibly helpful and knowledgeable.

Mark Mayson · Jun 2026 Google

Big thanks to Ron. He was incredibly patient and helpful over the phone, taking the time to walk myself and the installer through every troubleshooting step. Through lots of testing he figured out the issue was definitely a hardware issue, which allows us to consider our next steps. Support fees are clear and they operate a “no fix no fee” policy. It is rare to find that kind of honesty combined with dedicated phone support nowadays. I highly recommend Ron, if you need help with your solar system don’t hesitate to give him a call.

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Alison F. Cockerill · Jun 2026 Google
How to find your fault code. Log into monitoring.solaredge.com → select your site → Events tab for historical faults. For live status and detailed fault codes, use the SolarEdge SetApp (requires Bluetooth proximity to inverter). In SetApp go to Status → Troubleshooting to see active fault codes. Note the exact code number and inverter serial number when booking. Note on code formats: Older SolarEdge inverters use numeric codes (1001, 1010 etc.). Newer residential inverters introduced from 2024 onwards use hexadecimal format codes (e.g. 2x0A, 2x11, 2x28, 3x11) — both formats are listed in this index.
Inverter & AC faults

Fault codes generated by the inverter in response to AC supply problems, DC overvoltage from panels, or ground faults. These typically cause the inverter to stop generating.

1001Grid fault
Inverter has disconnected from grid. Check AC isolator and consumer unit breakers. Reconnects automatically when grid conditions return to normal.
1003Grid voltage high
Grid voltage exceeded upper threshold (typically 253V). Usually grid-side — contact DNO if recurring. Common on high-density solar streets.
1004Grid voltage low
Grid voltage below lower threshold. Check AC connections and contact DNO if persistent.
1006Grid frequency high
Grid frequency outside acceptable range. Inverter disconnected as required by G98/G99 protection. Usually transient — reconnects automatically.
1007Grid frequency low
As above for under-frequency. Reconnects automatically when frequency stabilises.
1010 / 3x11 — AFCI arc fault Arc fault
Arc fault detected on DC string. Code 1010 appears on older inverters; code 3x11 on newer residential models. Do not touch DC cabling. Requires a qualified engineer to inspect all DC connections, MC4 connectors, and string wiring before any restart.
2x11 — Over temperatureNewer residential inverters
Inverter heatsink temperature too high — appears on newer residential models using the hexadecimal code format. Check ventilation clearances, ensure the inverter is not in direct sunlight or enclosed, and clear dust from heatsink vents. If conditions are within specification and the fault persists, the internal fan may require attention.
Power optimiser faults

Status codes from individual power optimisers — communication failures, under-voltage events, and pairing issues. One faulty optimiser does not stop the whole system, but reduces generation on that panel.

S_OKStatus normal
Optimiser is communicating correctly with the inverter. Status shown in SetApp and monitoring portal. No action required.
N/A · Not communicatingOptimiser offline
Optimiser is not communicating with the inverter. Check SetApp pairing status. Power cycle the affected string (turn string isolator off, wait 2 minutes, back on). If the optimiser still shows N/A, it may need re-pairing or replacement.
Under voltageInput voltage low
Optimiser input voltage too low. Usually caused by shading, soiling, or panel damage. Check panel with voltmeter — if voltage is correct at the panel, the optimiser itself may be faulty.
Open circuitNo panel connection
No panel connected or panel connection open. Check MC4 connectors at the panel and optimiser. Do not touch without isolating the string first.
Temporary inhibitStartup inhibit
Inverter is temporarily inhibiting the optimiser (e.g. during safety scan at startup). Wait for the inverter to complete its startup sequence — this usually clears within 5 minutes of generation starting.
Grid / G98/G99

Grid connection codes and events triggered by G98/G99 grid code settings. These are protection functions, not faults — they prevent the inverter from generating during grid faults.

Grid connection failedConnection error
Inverter failed to connect to grid after a disconnect event. Check AC isolator is on. If grid is present and isolator is on, the inverter may be in a wait state — give it 5 minutes to reconnect.
Reactive power limitationDNO export limit
Inverter limiting generation due to power factor requirements set by the DNO. May be configured as part of G99 export licence — check installer's commissioning report.
Export limitation activeExport limit configured
Export limit configured on the inverter is constraining generation. Expected behaviour if an export meter is fitted. Contact installer if unexpected.
2x28 — Grid is downNewer residential models
No AC grid detected — code used on newer residential inverters with hexadecimal format. Check AC isolator and consumer unit. Equivalent to the "Grid connection failed" event on older models. Reconnects automatically when grid is restored.
2x1F / 2x20 / 2x21 / 2x29 — Grid voltage limitVoltage above or below country limit
Grid voltage has exceeded or fallen below the country-specific limit configured in the inverter. These codes appear on newer residential models and cover both overvoltage and undervoltage events. Transient events reconnect automatically; recurring faults should be reported to the DNO.
Communication faults

Faults related to data communication between inverter and monitoring portal, and between the inverter and other system components.

Communication error with monitoringPortal connectivity
Inverter is not uploading data to monitoring.solaredge.com. Check LAN cable or WiFi dongle LED (should be solid green). Check router hasn't changed IP range. SetApp will still show live data even when monitoring is offline.
Inverter not pairedSetApp pairing lost
SetApp cannot communicate with the inverter. Ensure Bluetooth is enabled on your phone. Stand within 3m of the inverter. If still unable to pair, try clearing SetApp data and restarting the pairing process.
RS485 communication errorBus communication fault
Communication fault on the RS485 bus (typically inverter to energy meter). Check RS485 cable polarity and connections at both ends. Ensure termination jumper is set correctly if multiple devices on bus.
Solar / PV faults

Faults related to DC string voltage, power, and insulation — the PV side of the system.

PV voltage too highDC overvoltage
String voltage exceeds 600V DC maximum. Do not touch DC cabling. Requires a qualified engineer to check string configuration — may indicate panels wired incorrectly in series.
Minimum string powerLow power threshold
String power below minimum threshold for generation. Usually transient at dawn/dusk. If occurring mid-day, check for shading or soiling on panels.
PV isolation fault / 2x19 PV not isolated from ground
PV string is not properly isolated from ground — insulation resistance below safe threshold. Code 2x19 is used on newer residential models. Do not touch DC cabling. Requires an engineer to check string cabling, MC4 connectors, and panel junction boxes for damage or water ingress.
2x0A — Ground fault Ground fault — newer models
Ground fault detected — insufficient insulation between DC conductors and earth. Appears on newer residential inverters. Closely related to 2x19 (PV isolation); both indicate a DC-side safety fault. Do not touch DC cabling. Engineer inspection and insulation resistance testing required before any restart.
2x0F — DC overvoltageNewer residential models
DC string voltage exceeded the inverter maximum — appears on newer residential models. Same response as "PV voltage too high" on older models. Do not touch DC cabling. Requires an engineer to check string configuration.
Code not listed here?

SolarEdge releases updates that may introduce new fault codes. If your code isn't listed, share the exact code from your event log and we'll identify it. SolarEdge also maintains fault code documentation on their support portal.

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Full diagnostic guides by fault type
N/A · not communicating
Power optimiser not communicating

Pairing, under-voltage, shading, and hardware fault diagnosis.

1010 · AFCI arc fault
Arc fault detected

What triggers AFCI, when it is safe to restart, and when to call an engineer.

Grid fault · export limitation
Grid events and export limits

G98/G99 disconnects, DNO export limits, and reactive power settings.

FAQ

SolarEdge fault code questions

SolarEdge fault codes appear in two places — the monitoring portal Events tab at monitoring.solaredge.com, and in SetApp under Status > Troubleshooting. SetApp gives the most detail and works via Bluetooth without an internet connection. Note the exact fault code number and the inverter serial number before contacting support.
An optimiser showing N/A means it is not communicating with the inverter. This is usually caused by the optimiser losing pairing after a power cycle, a shading event causing under-voltage, or a hardware fault in the optimiser. Open SetApp > Status > Optimisers to see which unit is affected and its last reported voltage. If voltage is zero, the optimiser or the panel connection may be the fault.
Many SolarEdge fault codes clear automatically when the fault condition resolves — grid voltage events are an example. For persistent codes, a power cycle (AC isolator off, wait 30 seconds, back on) is the first step. Do not repeatedly cycle power if the same code returns — that indicates a persistent fault that needs diagnosis. AFCI arc faults and PV isolation faults should not be cleared without a qualified engineer checking DC cabling first.
Recurring fault codes often indicate a hardware issue rather than a software glitch. If a reset temporarily clears the code but it returns, STS recommends a free remote diagnostic to check components like optimisers, DC cabling, and the inverter itself.
The remote diagnostic is free — send us the exact code from your event log or SetApp and we'll tell you what it means and the likely cause at no charge. If it's something we can put right remotely — a settings or grid-parameter correction, a properly-guided reset, or an optimiser re-pair — that's a flat £75, and if we can't fix it remotely there's nothing to pay. Codes that point to a physical fault, like an AFCI arc fault, a PV isolation fault, or a failed optimiser, need an on-site visit quoted up front from £245. Full pricing →
Usually the same day. Most SolarEdge codes can be read and interpreted remotely from your monitoring data or a SetApp screenshot in about 30 minutes, and anything that's a settings or grid-parameter fix we sort in that session. If the code is a safety fault — an arc fault or isolation fault — we'll confirm it remotely and book the earliest on-site slot rather than have you reset it blind.
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