Error F56 indicates that the internal intermediate DC busbar voltage has exceeded the maximum safety threshold (typically exceeding 800V DC on low-voltage battery architecture hybrid platforms). The DSP firmware engages hardware protection, instantly disabling IGBT gate pulses to prevent capacitor burst or semiconductor breakdown.

⏱ 30-45 Mins Troubleshoot →

CODE F13 SUN-12K-SG04LP3-EU Critical

Grid Inverter Hardware Overcurrent

Error F13 indicates that the inverter hardware protection circuit detected an instantaneous AC current spike exceeding the safe threshold during a grid-tied operational mode transition, tripping the IGBT driver protection latch.

⏱ 30-60 Mins Troubleshoot →

CODE F18 SUN-12K-SG04LP3 High

GFCI Leakage Current Trip

Error F18 indicates that the residual current monitoring unit (RCMU/GFCI) detected an AC or DC leakage current to ground exceeding the safety limit (typically >30mA continuous or >300mA instantaneous spike), triggering an emergency disconnect from the grid.

⏱ 30-45 Mins Troubleshoot →

CODE F24 SUN-12K Hybrid Inverter Series Critical

Deye F24 Grid Relay Failure

Error F24 indicates an internal grid relay self-test failure. During pre-synchronization or disconnection routines, the digital signal processor (DSP) senses an abnormal state across the AC grid safety contactors—such as welded/shorted contacts, open drive coils, or a corrupted voltage feedback signal across the relay bridge.

⏱ 45-90 Mins Troubleshoot →

CODE F18 SUN-8K-SG04LP3 High

AC Over Current Fault

Fault F18 occurs when instantaneous AC output current exceeds the hardware peak current threshold, indicating a downstream short circuit, heavy inrush current, or internal inverter bridge failure.

⏱ 20-30 Mins Troubleshoot →

CODE F13 SUN-8K-SG04LP3 Medium

Grid Over Frequency Fault

Fault F13 indicates that the utility grid or generator frequency has exceeded the country-code safety limits (typically 50.5Hz or 51.5Hz for 50Hz grids, or 60.5Hz for 60Hz grids).

⏱ 10-20 Mins Troubleshoot →