Technicians often look for diagnostic codes (like 3 red flashes) indicating the S1-024-39718-000 is stuck open or closed

This switch is factory-set to actuate at 1

Smith 100165854 Pilot Assembly is a direct replacement component engineered for high-efficiency natural gas water heaters

The York S1-025-41336-000 Limit Switch is a critical OEM replacement part engineered for high-precision thermal monitoring in residential and light commercial furnaces

Tjernlund Products PS1505 Prover Switch 328140-751 Technicians often look for diagnosticThe Tjernlund Products PS1505 Prover Switch is a critical safety interlock designed specifically for Tjernlund Auto Draft inducers. As a veteran grade fan proving safety switch, it monitors vacuum pressure within the fan housing to verify that the inducer is operating at peak performance before allowing the burner circuit to fire. This SPST air pressure switch features a non adjustable set point of 0. 05" 0. 02" W. C. (increasing vacuum), ensuring