Lochinvar & A.O. Smith 100277940 Board 321702-401 Always verify the amperage and

Always verify the amperage and voltage rating on your specific wiring diagram before installation

This factory-authorized part ensures direct physical compatibility with York

Common Questions Is this a spring-return or non-spring return actuator

If voltage is present but the motor won't spin

The low-wattage 24V coil minimizes electrical load on the transformer while providing the magnetic force necessary to shift the internal slide even under high-head pressure conditions

Lochinvar & A.O. Smith 100277940 Board 321702-401 Always verify the amperage andThe Lochinvar & A. O. Smith 100277940 Board is a critical low voltage connection board engineered for precision signaling in high efficiency heating systems. Specifically designed for the Knight KH055 285 fire tube boilers, this OEM replacement part serves as the central communication interface between the main controller and auxiliary system components. As a veteran technician knows, maintaining signal integrity in commercial water heating