GSH - Outdoor Unit Not Running

Goodman Heat Pump: GSH

Re: Outdoor Unit Not Running

The indoor blower is operating, but the outdoor unit fan and compressor are not running.

CHECKOUT:

1. Check High Voltage Power & Contactor

• Check for 230VAC inlet power across L1 and L2 of the compressor contactor.
  • No Power ⇒ Check Disconnect and Breakers
    • Check for a "Short-to-Ground" before checking breaker!
• Check to see if the compressor contactor is pulled-in.
  • Not Pulled-In → Step 2. Check Low Voltage
  • Pulled-In + Inlet Power + Not Running = Bad Contactor or Bad Capacitor
    • Check for 230VAC on the leaving side of the contactor.
      • Power In + No Power Out = Bad Contactor
      • Power Out + Not Running ⇒ Check for a Bad Capacitor
        • Motor and Compressor may both be off on over-temperature

2. Check Low Voltage Power

• Ensure the thermostat is calling for either heating or cooling.
• At the control wiring, check for 24VAC between "R" and "C".
  • No Power = No power from furnace
  • Power Present ⇒ Continue
• At the control wiring, check for 24VAC between "Y" and "C".
  • No Power = No Call from the Thermostat ⇒ Recheck Stat
    • Look for a Condensate Overflow Switch at the air handler.
  • Power Present ⇒ Continue
• Check for 24VAC across the compressor contactor coil.
  • Power at Control Wiring + No Power at Contactor = Open Pressure Switch (LPS).
    • ​​​​​​​Check Refrigerant Pressures