Lochinvar & A.O. Smith 100109973 Switch L99H008 serves as the updated direct

serves as the updated direct replacement for HT31AR100

maintaining original equipment mounting points

or a capacitance reading on your multimeter that has drifted more than 6-10% from the 55 MFD rating

Industrial Durability: Rugged aluminum construction with high-quality synthetic rubber diaphragms for extreme temperature environments

Lochinvar & A.O. Smith 100109973 Switch L99H008 serves as the updated directThe 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