Use a multimeter to check for continuity across the switch terminals while the blower is at full speed

including hot surface ignition (HSI) and direct spark ignition (DSI) setups

this is the precise HVAC replacement motor required

Using a genuine McQuay drive shaft is essential for maintaining the rotational balance and operational efficiency of the motor-to-fan connection

this kit ensures the system maintains peak thermal transfer efficiency without the typical energy loss associated with manual or mechanical timers

Lochinvar & A.O. Smith 100275508 Board 30067439-890 Use a multimeter to checkWhen you're out in the field and a boiler stops firing due to a communication error, you need the reliable Lochinvar & A. O. Smith 100275508 NKC150 Main Board to restore full system logic. This OEM Lochinvar replacement part is the primary HVAC control module designed to manage the high efficiency performance of NKC150N and NKC150P heating systems. By integrating advanced SMART SYSTEM boiler control circuitry, this board processes inputs from sensors