ICP Defrost Control Board for YJ018GA1 — Heat Pump | Ships Today

Overview

This genuine OEM defrost control board (part number 1069364) is the brain of the defrost cycle on the ICP / Tempstar / Heil YJ018GA1 heat pump. It monitors coil temperature and run time, then initiates and terminates the defrost cycle to clear frost from the outdoor coil during heating. The board coordinates the reversing valve, compressor, and outdoor fan, and provides timing logic for proper heat-pump operation. A failed board leads to ice build-up on the coil, no defrost, short cycling, or a unit that won't run in heating mode.

Specifications

Compatibility

Direct OEM replacement for the ICP, Tempstar, Heil, Comfortmaker, and Arcoaire YJ018GA1 heat pump. Match the board part number and connector layout to your existing board before ordering.

Installation Guide

1. Safety First — Disconnect power at the breaker and pull the disconnect; verify zero voltage with a multimeter.
2. Access — Remove the condenser service panel to reach the control board.
3. Document — Photograph every connector and wire location before unplugging.
4. Remove — Release the board standoffs or screws, unplug each harness, and lift out the old board.
5. Install — Mount the new board, reconnect every harness per your photo, and set any defrost timing pins to match the original.
6. Test — Restore power, run a heating cycle, and confirm normal operation and defrost initiation.

Signs You Need a Replacement

• Outdoor coil ices over with no defrost cycle
• Heat pump short cycles or won't start in heating
• Reversing valve or fan not switching during defrost
• Burnt, corroded, or visibly damaged board components

Shipping & Returns

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