A1438 / F1439 Slot D temperature sensor 4 error fault in WEG CFW900 Drive
These codes indicate a Slot D Temperature Sensor 4 Error. This means the external sensor wire is broken or short-circuited.
Cause:
- Sensor 4 cable is broken.
- Sensor 4 is short-circuited.
- Sensor 4 is located in an extremely low temperature environment.
Remedy:
Check temperature sensor 4 cabling for open or short circuits. Verify that surrounding environmental temperatures are within system parameters.
