York S1-373-23868-001 Defrost Control Kit

The York S1-373-23868-001 Defrost Control Kit is an essential OEM replacement engineered to restore the automated defrost sequences in York E4TS heat pumps and compatible high-tonnage units. This diagnostic-driven control board manages the critical transition between heating and defrost modes based on coil temperature and compressor run time, preventing excessive frost accumulation on the outdoor coil. By precisely monitoring the defrost sensor resistance and ambient air conditions, the S1-37323868001 ensures that the system maintains high heat transfer efficiency even in sub-freezing environments. As a direct replacement for legacy York part number 208T45, this kit integrates seamlessly with existing field wiring, utilizing a solid-state logic board to reduce mechanical relay failure. For technicians, installing this genuine York defrost board eliminates common nuisance tripping and "iced-over" coil service calls, ensuring the heat pump defrost cycle operates according to factory specifications and protects the compressor from liquid slugging during mode shifts.

Key Benefits

• Precise Defrost Timing: Features selectable 30, 60, or 90-minute intervals to match local climate and humidity profiles.
• OEM Compatibility: Specifically designed for York E4TS series and Johnson Controls equipment, ensuring correct pin configuration and mounting.
• System Protection: Minimizes wear on the reversing valve and compressor by managing smooth transitions between operation modes.
• Diagnostic Reliability: Replaces S1-373-23868-001 with updated circuitry to improve resistance to voltage spikes and environmental moisture.

Common Questions

How do I troubleshoot a stuck defrost cycle on a York E4TS?
Verify the defrost thermistor ohms match the manufacturer's temperature-resistance table and check for 24VAC across the board terminals; if the sensor is within spec but the relay fails to fire, the S1-373-23868-001 control kit most likely requires replacement.

Can I use this kit to replace older mechanical defrost timers?
Yes, this solid-state board is the recommended upgrade from older mechanical styles like York 208T45, providing more accurate sensing and a longer operational lifespan than contact-based timers.

What triggers the defrost cycle in this York control kit?
The board initiates a cycle when the defrost thermostat closes (indicating a cold coil) and the pre-set accumulator time (e.g., 60 minutes) has been met, ensuring ice is cleared before airflow is restricted.

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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.