Lochinvar & A.O. Smith 100277781 Control 326058-755 When should this O-ring be

When should this O-ring be replaced

Rugged Silver Contacts: Equipped with high-conductivity silver contact material for a 10 Amp load rating and long-term switching reliability

provided the liquid conductivity falls within the 10K ohm sensitivity threshold

ensuring calibrated gas flow and optimal BTU output for consistent combustion

Check for a solid ground connection between the burner and the ignition control module

Lochinvar & A.O. Smith 100277781 Control 326058-755 When should this O-ring beThe 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