Heat Pump: YHJD / YHJF Re: Contactor Won't Energize The defrost board does not energize the contactor on the outdoor unit. No Compressor Operation No Outdoor Fan Operation ► This condition is often mis-diagnosed as a Bad Defrost Board when the board is actually in a Lockout. ► There...

York Heat Pump: YHJF Re: Cooling - Low Suction Pressure The heat pump runs with a lower-than-normal suction pressure in the cooling mode. Customer typically reports low or no cooling. Qty Possible Causes: Low Refrigerant Charge 1 Bad Expansion Valve ...

Heat Pump: Cooling Re: Blown Fuse / Low Voltage Short Indications: A Blown Low Voltage Fuse or a Bad Transformer on the Air Handler Qty Possible Causes: Shorted Control Wire To Stat 1 Shorted Control Wire To H/P Bad Contactor Shorted Pressure...

York Heat Pump: YHJF Re: Cooling - High Discharge Pressure / High Head Pressure As the system runs in the cooling mode, the discharge pressure exceeds the normal operating pressure. R410A System Normal Head Pressure = 225 - 350 psig High Head Pressure = Above 400 psig Qty ...