An open switch usually indicates a restricted flue

When performing a furnace blower wheel repair

Advanced Air Venting: Continuous automatic air venting prevents the buildup of non-condensable gases

featuring a silicon nitride ignitor that provides superior durability over older carbide models

and mobile home furnaces

McDonnell & Miller WFE-24V Water Feeder Els PW 29614 An open switch usually indicatesThe McDonnell & Miller WFE 24V Water Feeder (Part Number 169550) is a heavy duty electronic water feeder designed for seamless integration with low water cut off (LWCO) systems in residential and light commercial steam boiler applications. Operating on 24Vac, this Uni Match model features field adjustable dwell feed cycles, allowing technicians to fine tune the timing and prevent overfeeding or "hunting" in the system. The 3 8" NPT connections and