Common Questions Is the York S1-026-35494-000 compatible with third-party motor mounts

leading to "arching" where the spark jumps to the chassis instead of reaching the electrode

the 1370903S replacement part ensures the burner circuit opens if internal plenum temperatures exceed safe operational parameters

Using a genuine HVAC thermal fuse ensures the system stays within manufacturer specifications for safety and performance

This valve uses 3/4" NPT threading

Lochinvar & A.O. Smith 100108421 Lower Thermostat 30067439-890 Common Questions Is the YorkFor professional contractors servicing Lochinvar or A. O. Smith residential electric units, the 100108421 Lower Thermostat is the critical OEM replacement part required to maintain precise thermal regulation. This WH9 lower thermostat is the officially authorized update for the legacy 9000507005 and 9000507015 models. Engineered with a patented bimetal sensor, this component ensures maximum temperature sensitivity and responsiveness to tank