Heat Pump: YorkGuard VI
Re: Compressor not Operating
These heat pumps are equipped with a YorkGuard VI module which monitors and controls unit operation and defrost.
An X/L terminal on the YorkGuard module sends a signal inside to flash a diagnostic light at the thermostat.
► Unlike previous models, the YorkGuard VI does not flash the actual diagnostic code at the thermostat, only a code 2, 3 or 4 to indicate a "Soft" or "Hard" lockout.
Possible Causes (From Most to Least Likely): |
Qty |
Unit in Lockout |
|
No Power to O/D Unit |
|
Bad Capacitor |
|
Thermostat Set Incorrectly |
|
Bad YorkGuard Module |
|
CHECKOUT:
1. Check Outdoor Unit
- Make sure the thermostat is set correctly and calling for Heat.
- Remove the access panel of the outdoor unit.
- Check for 230V inlet power on the compressor contactor.
2. Check Breaker & Compressor
- Pull the service disconnect switch.
- Check resistance between each leaving leg of the compressor contactor & ground.
- Any resistance = Electrical Short --> Check Compressor
- No Short --> Check Capacitor
- Check the unit breaker at the breaker panel and reset if necessary.
- Re-insert the service disconnect plug to restore power to the outdoor unit.
- Re-check for 230V on the contactor inlet.
- No Power --> Loose or Burnt Wires in Disconnect or Bad Breaker
3. Check Current Diagnostic Codes
- Observe the two LED lights on the control board.
- See YorkGuard VI Status and Fault Codes
4. Check Previous Diagnostic Codes
- Turn the thermostat to the "Off" position.
- Press and release the "Last Error" button near the top of the YorkGuard board.
- The board will display the last 5 diagnostic codes, starting with the most recent.
- See YorkGuard VI Status and Fault Codes
- When finished reviewing previous codes, be sure to clear the fault history before proceeding.
- Press and hold the "Last Error" button until both LEDs flash two times.