F038 fault in WEG CFW900 Drive indicates an IGBT W Desaturation. This means the W-phase power module experienced a severe overcurrent or short circuit, triggering an immediate hardware shutdown.
Cause:
- Short circuit between the motor phases W and U or W and V.
Remedy:
Inspect output motor cables and motor terminal box for short circuits between phase W-U or W-V. If motor connections are correct, verify IGBT state.
