Lochinvar & A.O. Smith 100109973 Switch 319847-401 such as flame signal loss

such as flame signal loss or rollout switch trips

If the switch opens before the 220°F threshold or remains open after the unit has cooled significantly

Millivolt Generation: Integrated thermopile provides consistent voltage to operate millivolt gas valves during power outages

technicians rely on this unit's robust solenoid design to handle rigorous cycling without drift

Lochinvar & A.O. Smith 100109973 Switch 319847-401 such as flame signal lossThe Lochinvar & A. O. Smith 100109973 Blocked Inlet Switch is a critical safety component designed for high efficiency condensing boilers and water heaters. As a normally closed air pressure switch, its primary function is to monitor the intake system for airflow restrictions. If the intake air connection screen becomes clogged or the vent piping is obstructed, the switch detects a fall in pressure and opens the electrical circuit, instantly shutting