Lochinvar & A.O. Smith 100275508 Board 321894-709 If you hear a high-pitched

If you hear a high-pitched shriek or notice reduced airflow at the registers

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reduced moisture output

Lochinvar & A.O. Smith 100275508 Board 321894-709 If you hear a high-pitchedWhen 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