York S1-373-23870-001 Defrost Control Kit

Ensure reliable evaporator performance in sub-freezing conditions with the York S1-373-23870-001 Defrost Control Kit. This genuine Source1 OEM replacement, part of the YorkGuard VI sub-brand, is engineered specifically for EFH, EEB, and ECS series heat pumps. As a veteran-grade solution for heat pump defrost board failures, this kit replaces legacy part numbers including 1157-83-550B and 37323870001. It utilizes advanced time/temperature initiation and termination logic to prevent excessive ice buildup on outdoor coils, maintaining system COP even in extreme climates. The kit is a comprehensive field solution, including the defrost control circuit board, mounting plate, dual 2-wire harnesses, and specific 1/4" and 3/16" terminals. Whether you are servicing a standard electric heat setup or a fossil fuel dual-fuel application, the included wiring schematics ensure high-accuracy integration with the existing system’s sensors and safety switches.

Key Benefits

• Broad Compatibility: Direct drop-in HVAC defrost control for York, Coleman, and Luxaire EFH, EEB, and ECS units.
• Optimized Efficiency: Precision defrost cycle management significantly reduces supplemental heat run-time and total energy consumption.
• Complete Field Kit: Includes Source1 defrost control board, mounting hardware, and harness adapters to eliminate mid-job supply runs.
• Enhanced Diagnostics: Integrated logic monitors sensors and safety switches to protect the compressor from liquid slugging during defrost transitions.

Common Questions

• Does this board support both electric and gas backup? Yes, the control kit includes specific wiring diagrams for both electric heat and fossil fuel (dual fuel) configurations.
• What part numbers does this replace? This kit is the direct replacement for S1-373-23870-001, 373-23870-001, and the older YorkGuard VI 1157-83-550B models.
• How does this control initiate defrost? It utilizes time/temperature logic, monitoring the coil sensor and a selectable timer to ensure defrost only occurs when necessary.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.