York Package Heat Pump: BHQ

Re: Reversing Valve Energized in Heat

The thermostat is calling for heat but the unit is producing cold air because the reversing valve is energized.

CHECKOUT:

1. Check Operation

• Make sure the thermostat is set correctly and calling for Heat.
• At the outdoor unit, check for 24VAC between "O" and "C" (at the control wire connection).
  • No Power + Reversing Valve Energized →
  • Power Present → Step 2. Check Thermostat/Wiring

2. Check Thermostat/Wiring

• Remove the Orange control wire from the terminal board.
• Check for 24VAC between the Orange control wire and "C".
  • Power Present ⇒ Remove the Orange wire from the thermostat subbase, then re-check for power on the Orange wire at the O/D unit.
    • No Power = Bad or Mis-Configured Thermostat
    • Power Still Present = Shorted Control Wiring
  • No Power ⇒ Check for 24VAC between the now empty "O" terminal and "C".
    • Power Present ⇒ Check HP jumper plug on the CFM board (Should be removed).