Lochinvar & A.O. Smith 100112678 Flame Sensor 323055-751 A failed switch usually results

A failed switch usually results in a "no heat" call because the safety circuit remains open

This model requires a 208-230V

Contractors value its field-selectable control options

Common Questions & Technical Support: What unit heaters are compatible with the 3900-0361-888

it operates on 115V single-phase power and is rated for a maximum working pressure of 175 PSIG

Lochinvar & A.O. Smith 100112678 Flame Sensor 323055-751 A failed switch usually resultsThe Lochinvar & A. O. Smith 100112678 Flame Sensor is a critical OEM safety component engineered for precise flame rectification in high efficiency boilers and water heaters. Designed for Lochinvar Knight and A. O. Smith B4940, B5930, B5940, and B7930 series units, this sensor monitors the burner's ionized path to ensure the gas valve remains energized only when a stable flame is present. Constructed with a high grade Kanthal or equivalent alloy rod