York S1-025-22273-003 Limit Switch This often stems from a

This often stems from a dirty furnace air filter

Swapping the 415-43676-03 with a different temperature rating will compromise the safety logic of the gas control valve and may lead to premature shutdowns or hazardous operating conditions

requiring a replacement like the 100241

This HVAC flue seal is compatible with Reznor gas-fired unit heaters including several series of the UDSA

A standard 4mm Allen wrench is required to secure the cartridge into the valve body

York S1-025-22273-003 Limit Switch This often stems from aThe York S1 025 22273 003 Limit Switch is a critical OEM safety component engineered for precise thermal monitoring in high performance HVAC systems. This SPST automatic reset limit switch is calibrated to open the electrical circuit at 160F, effectively halting operation to prevent heat exchanger damage or unsafe conditions. Once the induction or blower housing temperature stabilizes and drops to the 120F close setpoint, the switch automatically