AC_IN_FAIL / MAINS_LOST
Input Amber / Alarm Red solid
Utility grid failure, AC breaker tripped, or line voltage out of range
1. Measure incoming AC voltage with a multimeter;
2. Check input circuit breaker and upstream distribution;
3. System automatically soft-starts upon power restoration.
DC_OV_SHUTDOWN / LOCKOUT
Alarm Red solid, module output locked out
DC bus overvoltage or internal feedback sensor fault
1. Measure actual DC bus terminal voltage;
2. Cycle AC supply breaker to discharge capacitors and reboot;
3. Replace power module if fault recurs persistently.
FAN_FAIL / OVER_TEMP
Temp Yellow solid, fan halted or derated
Air intake dust blockage or fan bearing obstruction
1. Clean dust accumulation from intake grilles and filters;
2. Verify ambient room air conditioning is operational;
3. Replace cooling fan if rotation remains stalled.