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Sunsynk inverter error codes, the full list
Sunsynk hybrid inverters show faults as F01 to F64 on the screen or in the SunSynk Connect app. Find your code below, see how urgent it is, and open the step-by-step fix. Start by typing your code:
| Code | What it means | Urgency | Fix |
|---|---|---|---|
| F08 | GFDI relay failure (ground-fault protection) | Stop, call a pro | Full fix guide → |
| F13 | Working/grid mode changed | Self-clears | Full fix guide → |
| F18 | AC overcurrent fault (hardware) | Check & restart | Full fix guide → |
| F20 | DC overcurrent fault (hardware) | Check & restart | Full fix guide → |
| F22 | Emergency-stop fault | Stop, call a pro | Full fix guide → |
| F23 | AC leakage current (transient) | Self-clears | Full fix guide → |
| F24 | DC insulation impedance failure | Stop, call a pro | Full fix guide → |
| F26 | DC busbar unbalanced | Check & restart | Full fix guide → |
| F29 | Parallel CAN-bus fault | Check & restart | Full fix guide → |
| F34 | AC overcurrent fault | Check & restart | Full fix guide → |
| F35 | No AC grid / no utility | Self-clears | Full fix guide → |
| F41 | Parallel system stop | Self-clears | Full fix guide → |
| F42 | AC line low voltage | Self-clears | Full fix guide → |
| F47 | AC over frequency | Self-clears | Full fix guide → |
| F48 | AC under frequency | Self-clears | Full fix guide → |
| F56 | DC busbar voltage too low | Check & restart | Full fix guide → |
| F58 | Battery BMS communication fault | Check & restart | Full fix guide → |
| F63 | Arc fault (AFCI), fire risk | Stop, call a pro | Full fix guide → |
| F64 | Heat sink high temperature | Check & restart | Full fix guide → |
Reading the code on your Sunsynk
The fault shows on the inverter's LCD or under System Alarms in the SunSynk Connect app. Note the exact code (and whether it cleared on its own) before you start.
How to read the urgency rating
Self-clears usually a passing grid or weather event; the inverter restarts itself.
Check & restart do a few safe checks and a proper power cycle.
Stop, call a pro a safety or hardware fault; don't keep resetting it.