With a maximum working pressure of 650 PSIG and a porous molded core that minimizes pressure drop

often due to a fouled or failing York S1-025-38950-000

Inspect the lead for brittle insulation

ensure the float moves freely in a vertical plane

The assembly is built to withstand the thermal stress of constant cycling

Carrier HK42FZ018 Control Board 30067439-890 With a maximum working pressureThe Carrier HK42FZ018 Control Board is a critical integrated furnace control board engineered for high performance management of single stage heating systems. For technicians servicing Carrier, Bryant, and Payne furnaces, this genuine OEM replacement part provides the necessary logic to coordinate the ignition sequence, blower motor timing, and inducer operation. It effectively replaces older part numbers and is a direct fit for popular series like