Sunsynk · An established brand in the UK. 17 codes across 1 product family, each taken from the manufacturer’s manuals. Sunsynk technical support ↗
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Type the code on your display or a word from its meaning. Each code opens its own page with what it means, whether it is safe and what you can check.
17 codes
| Code | Meaning | Stops? | Homeowner check? |
|---|---|---|---|
| F13 | Working mode change - grid type/frequency changed, battery mode set to 'No battery', or (old firmware) system work mode changed. | Partly | Yes |
| F18 | AC side over current fault (hardware). | Yes | Yes |
| F22 | Emergency stop / remote shutdown. | Yes | Yes |
| F23 | AC leakage current or transient over current (leakage current fault from PV). | Yes | Yes |
| F24 | PV isolation resistance is too low. | Yes | Yes |
| F26 | Bus unbalanced fault. | Yes | Yes |
| F34 | AC overload fault. | Yes | Yes |
| F35 | No utility - grid lost. | Partly | Yes |
| F42 | Grid voltage fault (AC line low voltage). | Yes | Yes |
| F43 | Grid voltage out of range (over-voltage). | Yes | Yes |
| F47 | Grid over frequency fault. | Yes | Yes |
| F48 | Grid under frequency fault. | Yes | Yes |
| F55 | DC voltage high fault - BUS voltage too high. | Yes | Yes |
| F61 | Inverter switched off manually. | Yes | Yes |
| F64 | Heat sink temperature too high. | Yes | Yes |
| W04 | Meter communication failure. | No | Yes |
| W05 | CT wrong direction. | No | Yes |