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Check for a solid ground connection between the burner and the ignition control module
The pilot-operated mechanism uses the refrigerant pressure differential to assist the valve in opening
ensuring calibrated gas flow and optimal BTU output for consistent combustion
Most failures in the field stem from voltage spikes
When should this O-ring be replaced
Lochinvar & A.O. Smith 100277781 Control 326058-755 Check for a solid groundThe Lochinvar 100277781 Control (Model FB751 1251) is an integrated control board engineered specifically for Crest Heating Boilers. As a critical OEM replacement part, this module manages the firing sequence, ignition control, and safety parameters for high efficiency hydronic systems. This model is a direct boiler part replacement for units with serial numbers beginning with 4015, ensuring seamless integration with existing HVAC wiring harnesses and
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