Once the water level is restored above the standard probe

always verify the MPN HK61EA005 against your specific air handler model before installation

handling demanding electrical loads without external relays

Built with a 7-inch sensing probe

Common Questions How do I verify the heater is functioning correctly

York S1-373-23870-001 Defrost Control Kit Refrigerant Once the water level isEnsure reliable evaporator performance in sub freezing conditions with the York S1 373 23870 001 Defrost Control Kit. This genuine Source1 OEM replacement, part of the YorkGuard VI sub brand, is engineered specifically for EFH, EEB, and ECS series heat pumps. As a veteran grade solution for heat pump defrost board failures, this kit replaces legacy part numbers including 1157 83 550B and 37323870001. It utilizes advanced time temperature initiation