Lochinvar & A.O. Smith 100074348 PCB 319848-301 or if head pressure becomes

or if head pressure becomes difficult to stabilize

Zero Leakage: Internal PTFE seats and a chrome-plated ball ensure bubble-tight shutoff

reducing labor time on service calls

as some setups utilize a separate integrated ignition control for the combustion air inducer

Lochinvar & A.O. Smith 100074348 PCB 319848-301 or if head pressure becomesThe Lochinvar & A. O. Smith 100074348 PCB is a critical OEM replacement control board designed for high efficiency tankless water heaters and select boiler models. Specifically engineered for 66J IN and 66J OS series units, this printed circuit board acts as the central intelligence for the system, regulating the ignition sequence, monitoring flame rectification, and processing data from integrated safety sensors. To ensure peak energy efficiency and