York Parts S1-33101975001 Heat Pump Defrost Control BoardHeat Pump Defrost Control Board from York Parts (S1 33101975001) is a crucial replacement that keeps your heat pump defrost cycles running smoothly. This Defrostdemand Kit replaces S1 03101975001, delivering reliable frost management and energy efficient operation. Designed for residential and light commercial York systems, it ensures consistent defrost timing and dependable performance. Engineered for compatibility with York heat pumps, this HVAC

Applications: Gas Fired Appliance

Setpoint at

Inlet/Outlet Tap: 1/4" Threaded Pressure Tap

The Bell & Gossett B-38 is a 1/2" NPT pressure reducing valve set

providing peace of mind for both local and cross-border installations

it restores peak furnace efficiency

The 36 inch capillary length offers flexible placement in control panels and equipment racks

The 1725-series pump delivers reliable fuel flow across a 100–200 PSI range and serves as a direct replacement for A1YD7154

It’s a practical replacement for worn-out components

making it a precise fit for compatible regulators

Designed for compatibility and durability

The Temperature Control Limit Switch is a critical safety component for gas furnaces