F172 fault in WEG CFW900 Drive indicates a Power Heatsink Fan Speed Fault. This means one of the main cooling fans has failed or jammed, triggering a trip to prevent overheating.
Cause:
Heat sink fan 2 speed fault.
- Dirt on the fan blades and rolling bearings.
- Defective fan.
- Defective fan power supply connection.
Remedy:
Check fan bearings and clear dirt build-up from blades. Ensure power supply connections to the fan are secure. Replace the fan module if mechanically defective.
