THGD - Blowing Hot Air - Cooling

York Heat Pump: THGD

Re: Blowing Hot Air - Cooling

CHECKOUT:

1. Check Refrigerant Pressures

• With the outdoor unit operating, hook refrigerant gauges to the system.
  • Blue ⇒ Suction Line (not true suction)
  • Red ⇒ Liquid Line
    • Both Pressures High = Unit in Heat Mode → Step 2. Check Low Voltage
    • Correct Pressures ⇒ Check thermostat setting and configuration.

2. Check Low Voltage

• Check for 24VAC between "O" and "C" on the defrost board thermostat connections.
  • Power → Step 2. Check Reversing Valve
  • No Power⇒ Check thermostat setting and configuration.

3. Test Reversing Valve

• Check for 24VAC across the two RV outputs on the defrost board.
  • Power on "O" + No Power on "RV" = Bad Defrost Board or No "Common" ⇒ Check for 24VAC between "R" and "C".

4. Test Reversing Valve

• Check for 24VAC across the two RV outputs on the defrost board.
  • Power on "O" + No Power on "RV" = Bad Defrost Board or No "Common" ⇒ Check for 24VAC between "R" and "C".