York Heat Pump Re: 331-01975-102 DEMAND DEFROST CONTROL Issue: Outdoor Unit Won't Come On The Demand-Defrost control has a selectable defrost curve. The original board is programmed at the factory with the correct defrost settings for the unit on which it is installed. The...

Package Heat Pump Re: No Heat When a customer reports "No Heat' with a heat pump, that generally indicates a problem with the indoor blower or electric heaters. ► There may be a problem with the heat pump itself, but the auxiliary heaters should cycle on to keep the temperature within 1...

York Air Handler: NAH York Package Heat Pumps: BHH, BHQ, BHZ Re: 031-01264-002 Control Board - Heaters Not Working The control board in these units operates the indoor blower and electric heaters. There is one on-board, line-voltage heater output and three DC Voltage heater outputs for DC...

York Package Heat Pumps: BHZ Re: Compressor not Running / Unit Locked-Out There are two control boards in this unit, a fan timer board and a defrost board. On the BHZ package units the defrost board controls the compressor contactor and condenser fan. Safeties: There is a high...

York Package Heat Pumps: BHZ Re: Outdoor Fan Not Running The BHZ Package Heat Pump uses a 1/4HP, 850 RPM, Standard PSC Condenser Fan Motor. There are two control boards in this unit, a fan timer board and a defrost board. On the BHZ package units the defrost board controls the compressor...