Lochinvar & A.O. Smith 100277781 Control R-22 or excessive noise and vibration

or excessive noise and vibration

it is designed to withstand high-temperature environments while maintaining a stable pilot flame pattern for reliable main burner ignition

Always verify the lead-end or shaft-end rotation requirement of your specific blower housing before installation

though you must also install the correct red-spring regulator kit and pilot orifice to complete the transition

or the 632200R pressure switch has failed

Lochinvar & A.O. Smith 100277781 Control R-22 or excessive noise and vibrationThe 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