ICP Defrost Control Board for YG048GA2 — Heat Pump | Ships Today

Overview

This is a genuine OEM defrost control board (OEM part #1069364) for the ICP/Tempstar/Heil YG048GA2 heat pump. The defrost board manages the outdoor unit's defrost cycle — it monitors the defrost thermostat and timer, energizes the reversing valve, and shuts the outdoor fan during defrost to clear frost and ice from the coil in heating mode. It also coordinates the contactor and the auxiliary/emergency heat handoff. When the board fails, the heat pump may ice over and never defrost, run defrost too often, fail to switch the reversing valve, leave the outdoor fan off, or stop responding to the thermostat entirely. A bad board can cause poor heating performance, frozen coils, and high energy use.

Specifications

Compatibility

Fits the ICP, Tempstar, Heil, Comfortmaker, and Arcoair YG048GA2 heat pump and related models. Match the board's part number, terminal layout, and defrost timing pins to your existing board before installing.

Installation Guide

1. Safety First — Disconnect power at the disconnect and breaker, then verify zero voltage with a multimeter.
2. Access — Remove the condenser control-panel cover.
3. Document — Photograph every wire and the defrost timing jumper position before disconnecting.
4. Remove — Label and disconnect the wiring, then unscrew or unclip the old board from its standoffs.
5. Install — Mount the new board, set the defrost timing pin to match the original, and reconnect each wire per your photo.
6. Test — Restore power, run a heat call, and force a defrost cycle to confirm correct operation.

Signs You Need a Replacement

• Outdoor coil ices over and never defrosts
• Reversing valve or outdoor fan not controlled correctly
• Heat pump unresponsive to thermostat calls
• Excessive or constant defrost cycling

Shipping & Returns

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