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Utilizing snap-acting
moisture in the sensing lines
The assembly features a high-grade EPDM rubber diaphragm and nitrile U-cup stem seals
Common signs include the furnace failing to ignite despite the inducer motor running
Lochinvar & A.O. Smith 100208407 Switch Els PW 29614 Utilizing snap-actingThe Lochinvar & A. O. Smith 100208407 Blocked Flue Switch is a critical safety component designed for high efficiency condensing boilers and water heaters. As a factory authorized replacement for PRS2708 and PRS2708K, this blocked flue pressure switch is calibrated to a specific 55" WC set point to detect dangerous venting restrictions. When flue gases cannot exit the heat exchanger due to obstructions like bird nests, ice, or excessive condensate