The Heil Quaker ICP 1085472 Defrost Control Board is a critical direct replacement component for ICP heat pump systems, engineered to manage timing and temperature parameters during the defrost cycle. This OEM control board monitors the liquid line temperature and outdoor coil status to initiate defrost cycles based on 30, 60, or 90-minute intervals, ensuring optimal heat transfer and preventing ice accumulation. Designed for 24V HVAC control circuits, it replaces older or failed logic modules in units from brands like Heil, Tempstar, Comfortmaker, and Arcoaire. For technicians, this board simplifies field diagnostics with clear terminal labeling for the DFT sensor, reversing valve (O), and compressor contactor (Y) leads. Replacing a faulty board with this specific ICP furnace and AC part restores system efficiency and prevents unnecessary compressor wear caused by inefficient defrost sequencing.

Key Benefits

• Compatible with a wide range of ICP residential heat pumps for streamlined truck stock.
• Adjustable defrost cycle timing pins allow for site-specific performance tuning.
• Robust solid-state circuitry resists common electrical surges and moisture-related failures.
• Standardized spade terminal connections ensure a rapid, drop-in installation for field repairs.

Common Questions

How do I troubleshoot a suspected 1085472 defrost board failure?
Verify 24V power at the R and C terminals. If the outdoor coil is significantly iced over and shorting the speed-up pins does not force a defrost cycle, the logic chip or onboard relay has likely failed.

Can this board replace third-party universal defrost controls?
While universal boards exist, using this OEM 1085472 board ensures the internal timing logic matches the original cabinet design and sensor thermistor curve for precise defrost initiation.

Do I need to replace the defrost thermistor when installing this board?
It is standard practice to test the DFT sensor resistance. If the sensor is out of spec, replacing it alongside the board prevents erratic defrost behavior.

Notes

Item is Non Cancelable / Non Returnable

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.