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often displaying a flash code for "pressure switch stuck open
immediately halting the heating cycle to prevent hazardous conditions
Manual override lever: Allows for manual opening during system filling or maintenance (NC models only)
This OEM replacement transformer is manufactured to precise tolerances to maintain system impedance and protection levels
Lochinvar & A.O. Smith 100074348 PCB 318518-761 often displaying a flash codeThe 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
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