P0 Compressor protector open

What the control is telling you

Compressor is off; the control sees no current in either the run or start winding (internal overload open). Clears after one normal cycle or by power cycling the 24 VAC.

Applies to: Communicating 2-stage condensers and heat pumps with the PCBHR104 or PCBHR105 outdoor control (7-segment display): ASXC16/18, GSXC16/18, DSXC16/18, ASZC16/18, GSZC16/18, DSZC16/18

Likely causes

• Compressor internal overload open (hot compressor)
• Open run winding
• Compressor not wired correctly or faulty wiring
• Failed run capacitor or capacitor wiring

Test and repair steps

1. Warning: Kill power to the outdoor unit before touching wiring, the compressor terminals or the control.
2. If the compressor shell is hot, allow it to cool fully before testing again.
3. Check run capacitor and wiring.
4. Measure compressor windings and check terminals and wiring to the control.
5. Find the cause of overheating (charge, airflow, voltage) before returning to service.

Models that show this code

24 models in Goodman/Amana ComfortNet ASZC/GSZC/DSZC

Other codes on the same units

• d4 Shared data from the loader rejected
• E5 Outdoor control low-voltage fuse open
• H8 High line voltage
• L1 Lockout - low pressure switch tripped 3 times
• L2 Lockout - high pressure switch tripped 3 times
• L6 Lockout - open start circuit detected 4 times
• L7 Lockout - open run circuit detected 4 times
• L8 Low line voltage