typically caused by a dirty air filter

Standard Fitting: Features a standard 11/32-32 male nut for direct attachment to standing pilot gas valves

the switch breaks the electrical circuit to the gas valve when excessive heat is detected at the relief opening

Durable Construction: Manufactured using high-quality materials to resist standard wear and corrosion in demanding HVAC environments

The Johnson Controls T-4002-122 is a professional-grade terminal connector engineered specifically for T-4002 series high-volume thermostats

Lennox 47K18 Rollout Switch typically caused by a dirtyThe Lennox 47K18 Rollout Switch is a critical safety component engineered for forced air furnaces and industrial heating systems, designed to interrupt the burner circuit if flame rollout or excessive heat is detected. This OEM Lennox rollout switch features an SPST (Single Pole Single Throw) configuration and is factory calibrated to actuate at 400 degrees Fahrenheit. As a safety limit device, it utilizes a manual reset mechanism, requiring a