920806 Nordyne DEFROST CONTROL BOARD

The 920806 Nordyne Defrost Control Board is a factory‑grade replacement designed to restore proper defrost operation in compatible Nordyne, Intertherm, and Miller heat pump systems. This board regulates compressor and outdoor fan sequencing, monitors coil temperature, and initiates timed defrost cycles to prevent ice accumulation during cold‑weather operation. Its rigid printed‑circuit design ensures stable performance, accurate timing, and long‑term reliability in residential heat pump applications. Ideal for replacing failed or intermittent defrost controls that cause coil freeze‑ups, short‑cycling, or poor heating performance.

🧊 Product Overview

• Part Number: 920806

• Type: Defrost Control Board

• Function: Manages defrost cycles in heat pump systems to prevent coil icing and maintain efficiency

• Voltage: 24V control signal

• Delay Settings: Includes timed delay and temperature sensor input

• Weight: 0.43 lbs

• Package Dimensions: 10″ × 12″ × 12″

• Vendor: Nordyne 

This board monitors outdoor coil temperature and compressor runtime, initiating defrost cycles when conditions require. It’s essential for maintaining proper heat pump operation in cold climates.

✅ Compatibility

The 920806 board replaces part number 624704 and is commonly found in:

It’s used in both vertical and horizontal configurations, particularly in mobile/modular housing and light residential applications.

🛠️ Installation Notes

• Mounts directly to the control panel or outdoor unit

• Connects to outdoor temperature sensor and compressor contactor

• Replace if defrost cycles fail to initiate or terminate properly

• Ideal for technician kits servicing R-22 and R-410A heat pump platforms