A962_O: Compressor U Phase Over Current

EcoNet - A962_O ยป

Status

Unit will try 3 times and will lock out until manually reset by cycling power to outdoor unit and indoor unit for 3 min.

Description

Scroll Compressor Models:

Windings on compressor not correct.  For Scroll compressors, windings should be equal as these are essentially AC three phase compressors.  Unequal winding resistance can cause higher current on one leg. 

Rotary Compressor Models:

Rotary compressors are single phase PSC motors. the winding resistances will be different. The capacitor is only used when system is operating on line voltage via the double pole contactor.

Expected Operation

3 strikes, and lockout

Solution


Check compressor and motor windings and harness from drive to compressor. Ensure harness plugs is seated properly at both ends and connections are clean and proper. Replace compressor or harness as diagnosed.  If compressor and harness are OK, verify capacitor and contactor on rotary compressor models. If compressor/motor and capacitor and contactor are within tolerance, replace drive.