York 1NP0418 Conversion Kit 30067439-890 and always perform a soap-bubble

and always perform a soap-bubble leak test on the connection point after restoring gas pressure

This SPST (Single Pole Single Throw) safety switch is engineered to interrupt the heating cycle if it detects sustained thermal exposure near the burner assembly

By sensing excess heat at the vent assembly

the internal fuse has blown and the part needs replacement

York 1NP0418 Conversion Kit 30067439-890 and always perform a soap-bubbleFor HVAC technicians converting York gas furnaces from natural gas to liquid propane, the York 1NP0418 Conversion Kit is the essential OEM component for field adjustable fuel transitions. This kit is specifically engineered for York TG8S, TG9S, TGLS, and TM9E series furnaces using Single Stage White Rodgers gas valves. Proper installation ensures optimized manifold pressure and prevents issues like sooting or flame rollout caused by incorrect gas to