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the S1-331-02979-000 is the officially updated version
Always cross-reference your specific model string and oil pump configuration to ensure a match
Smith boiler control modules
Replacing these components alongside the new HVAC compressor is professional best practice to protect the scroll compressor motor from voltage spikes or low-torque starts
Reznor 203525 Wire Harness THPU32HP7Y the S1-331-02979-000 is the officiallyThe Reznor 203525 Wire Harness is a critical OEM replacement component engineered for precise electrical integration within Reznor UDBP and UDBS unit heaters. Specifically designed for 100,000 to 125,000 BTU modelsincluding the UDBP100, UDBP125, UDBS100, and UDBS125this harness features a 9 pin terminal connector to ensure secure signal and power distribution across the system. As a veteran grade HVAC replacement part, it eliminates the common "no
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