1016567R Nordyne Defrost Control Board 

Product Overview

1045845R is the official Nordyne defrost control board designed to manage the defrost cycle in heat pump systems. It monitors outdoor coil temperature, initiates and terminates defrost cycles, and provides real-time error code display for rapid troubleshooting.

Cross-Reference Part Numbers

(Source: FurnacePartSource.com)

Compatibility

• Fits Nordyne and Intertherm heat pump units that originally used the 1035831R defrost board

• Consult your OEM parts manual for exact model fitment

Technician Notes

• Always wear an ESD wrist strap and handle the board by its edges.

• Verify dip-switch and jumper settings match your outdoor temperature sensor calibration requirements.

• Test the defrost thermistor: expect ~12 kΩ at 32 °F and ~5 kΩ at 77 °F.

• Inspect the outdoor coil sensor, termination thermostat, and wiring connectors for corrosion or damage.

• Confirm 24 VAC control voltage between R and C terminals before and after installation.

• Use the on-board LED blink codes to diagnose faults—refer to the OEM service manual for code definitions.

• Photograph the original wiring layout and board orientation to ensure accurate reinstallation.

• After replacement, run the system through a full defrost cycle in heating mode to verify operation.

Additional Resources

• Download the OEM wiring diagram and installation manual (PDF)

• Access a printable defrost board cross-reference cheat sheet

• Watch our step-by-step video guide on replacing the defrost control board

Replaced by 1035831R