Status
Unit will make 3 attempts at operation before going into a permanent lockout.
Description
The outdoor fan is experiencing a phase imbalance.
Expected Operation
System will shutdown if running and will try again. If it happens 3 times, the unit will lockout requiring a manual reset.
Cause
1. Incorrect fan model data is loaded into the UODC controller.
2. Gan motor is disconnected or has wiring damage.
3. Fan motor is damaged (e.g. winding resistance is out of tolerance or bearing failure).
4. Compressor drive is damaged.
Solution
1. Reload model data using app - Bluetooth Update button in service tab
2. Check wiring between fan motor and inverter drive. Make sure wires are connected and have no visible missing insulation and that connectors are fully seated to plug housing and plug housing is fully seated to control. If necessary, replace wire assembly.
3. If wiring OK, measure winding resistance on fan motor and make sure no windings are shorted to ground or have an open circuit. If windings are bad, replace motor.
4. If fan motor and wiring is OK, replace drive.