ICP Defrost Control Board for YJ042GA1 — Heat Pump Defrost Timer | Ships Today

Overview

This OEM defrost control board (Part #1069364) manages the defrost cycle on your ICP YJ042GA1 heat pump. In heating mode, frost builds on the outdoor coil and strangles heat transfer. The defrost board watches coil temperature and accumulated run time, then briefly reverses the system into cooling to clear that frost while staging in the auxiliary heat strip to keep supply air warm. A failed board is a leading cause of an iced-over outdoor unit, weak heat, or a heat pump that runs continuously without satisfying the thermostat. It operates on a 24V control circuit and sequences the reversing valve, outdoor fan, and compressor contactor through each timed defrost event.

Specifications

Compatibility

Factory replacement for the ICP YJ042GA1 heat pump and shared across the Tempstar, Heil, and Comfortmaker units built on this chassis. Confirm your existing board reads 1069364 before ordering.

Installation Guide

1. Safety First — Disconnect power at the disconnect and breaker, then verify zero voltage with a multimeter.
2. Access — Remove the outdoor unit electrical service panel.
3. Document — Photograph every wire and terminal on the old board before disconnecting.
4. Remove — Label and disconnect the low-voltage and sensor leads, release the mounting standoffs, and lift out the failed board.
5. Install — Mount the new board on the standoffs and reconnect each lead exactly as photographed, including the defrost thermostat sensor.
6. Test — Restore power and confirm a normal heating call plus a correct on-demand defrost cycle.

Signs You Need a Replacement

• Outdoor coil ices over and never clears in heat mode
• Heat pump runs nonstop with weak or cool supply air
• Defrost cycle never starts or never ends
• Visible burn marks, corrosion, or relay chatter on the board

Shipping & Returns

Ships same day before 3 PM CST. 30-day returns. Backed by the National HVAC Parts fitment guarantee.