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If the board receives power but fails to initiate the draft inducer or signal the igniter
2-way normally closed solenoid valve specifically engineered for demanding HVACR steam and hot water applications
Durable Construction: High-grade ceramic insulator and specialized metal rod resist thermal stress in high-temperature combustion chambers
Common Questions: How do I know if this switch is failing
Lochinvar & A.O. Smith 100077872 Control 318172-701 If the board receives powerThe 100077872 (GSW 52720) is a genuine OEM hot surface ignition (HSI) control specifically engineered for select Lochinvar and A. O. Smith gas fired water heaters. As a veteran grade electronic ignition module, this component manages the critical timing sequences for the ignitor warm up, gas valve actuation, and flame rectification sensing. It operates on a 24 VAC control circuit, integrating high performance microprocessor logic to ensure precise
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