Description
The compressor drive has detected too much current on an internal component (inverter Power Module).
Expected Operation
If fault occurs 3 times in one call, unit will lockout and require manual reset.
Cause
1. Excessive load/temperature/duration.
2. A failed compressor or compressor drive.
Solution
1. Check all wiring to contactor, compressor and capacitor. Correct wiring errors, if present.
2. Check run/start capacitor. Replace, if necessary.
3. Check compressor winding resistance relative to ground to see if compressor windings are shorted. If shorted, replace compressor.
4. If compressor windings OK, replace compressor drive controller.