Yorkguard VI - Aux Heat Stuck On

York Heat Pump: YorkGuard VI

Re: Aux Heat Stuck On

►The auxiliary heaters stick on and the customer reports overheating of the controlled space.

The Yorkguard VI board controls Aux Heat operation through the W1-Out and W2-Out terminals.

Balance Point

If the outdoor ambient temperature is less than the Balance Point setting and above LTCO and a W input is received with a Y1 input, the control will energize the compressor contactor output based on the Y1 input and will energize the W1-Out immediately when the W input is received.

When the W input is received, the control will start a fifteen-minute timer. If the call for Y1 + W is still present after the fifteen-minute timer expires, the control will then energize W2-Out along with W1-Out. 

LTCO

If the outdoor ambient temperature is below the LTCO setting, the control will de-energize the compressor and energize W1-Out immediately when a Y1 input is received. W2-Out will act as 2nd stage heat and be energized on a call for W.

Defrost

The control will energize W1-Out 30 second prior to and during defrost operation. If W1-Out has been energized for 15 minutes W2-Out will be energized also. The W1-Out and W2-Out will remain energized (depending on the 15 minute timer) 180 seconds after the defrost cycle has been terminated. 

CHECKOUT:

1. Check Thermostat

• Make sure the thermostat is set correctly and NOT calling for Heat.

2. Check Heaters

• Check Air Handler and see if the auxiliary heat is operating.

3. Check Yorkguard

• Check for 24VAC between "W" and "C" at the outdoor unit.

4. Check Low Voltage Wiring

► Placing a jumper between "W" and "W1-OUT" or "W2-OUT" (at the air handler or heat pump) WILL CAUSE THE AUX HT TO STICK ON!