EE Outdoor control fault - compressor relay contacts welded

What the control is telling you

The outdoor control has detected that its own compressor relay contacts are stuck closed (board misoperation).

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

• Welded compressor relay contacts on the outdoor control

Test and repair steps

1. Warning: Kill power to the outdoor unit before touching wiring, the compressor terminals or the control.
2. Confirm the code is steady after a power cycle.
3. Replace the outdoor control with the correct replacement part and reload or verify shared data if needed.
4. Check the contactor and compressor circuit for the cause of the high relay load before returning the system to service.

Models that show this code

23 models in Goodman/Amana ComfortNet ASXC/GSXC/DSXC

Other codes on the same units

• Yellow 1 flash Low side fault / low pressure trip / low pressure lockout (older ComfortNet board)
• Yellow 2 flashes High side fault / high pressure trip / high pressure lockout (older ComfortNet board)
• Yellow 3 flashes Short cycling (older ComfortNet board)
• Yellow 4 flashes Locked rotor (older ComfortNet board)
• Yellow 5 flashes Open circuit (older ComfortNet board)
• Yellow 6 flashes Open start circuit / lockout (older ComfortNet board)
• Yellow 7 flashes Open run circuit / lockout (older ComfortNet board)
• Yellow 8 flashes Low or high line voltage (older ComfortNet board)