Cause : Inverter overheat comes when the heat sink overheats due to a damaged cooling fan or the heat sink within the drive has reached a temperature above the specified threshold.

"E04" fault in weg drive indicate that the heat sink within the drive has reached a temperature above the specified threshold.

1. Cooling system has faults.
2. Check for alien substances clogged in the heat sink.
3. An old cooling fan is not replaced with a new one.
4. Replace the old cooling fan with a new one.
5. Ambient temperature is too high.