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this differential pressure switch acts as a primary safety mechanism to verify proper combustion airflow before allowing the ignition sequence to proceed
Common Questions & Troubleshooting How do I verify if this switch is the cause of a '3-flash' error code
Key Benefits Direct OEM Interchange: Replaces the discontinued 100170479 and TST1121 parts without the need for additional retrofitting or mounting hardware
ensuring full backwards compatibility with legacy drive assemblies
How do I verify if the 790-400 is the correct replacement for my existing control
York S1-031-01976-000 Control Board Els PW 29614 this differential pressure switch actsThe York S1 031 01976 000 Defrost Control Board is a critical OEM replacement part engineered specifically for York, Luxaire, and Coleman heat pump systems. Designed to manage the precise timing and termination of the defrost cycle, this HVAC control module prevents excessive ice accumulation on the outdoor coil, preserving system efficiency during low ambient operation. Unlike universal boards, this York heat pump defrost board integrates seamlessly
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