ICP Defrost Control Board for YG048GB1 — Heat Pump 24V Defrost | Ships Today

Overview

This OEM defrost control board (ICP part number 1069364) governs the defrost cycle on your ICP/Tempstar/Heil YG048GB1 heat pump. It reads coil temperature and accumulated run time, then starts and ends defrost to clear ice from the outdoor coil during heating. The board sequences the reversing valve, compressor, and outdoor fan, and signals the indoor unit for auxiliary heat. A defective defrost board is the most common reason a heat pump ices over, blows cold air in heating mode, or never exits a frozen state. The board runs on a 24V control circuit with defrost timing pins and a coil temperature sensor input.

Specifications

Compatibility

Direct OEM replacement for the ICP / Tempstar / Heil YG048GB1 heat pump and other ICP-family units that originally shipped with defrost board 1069364. Always match the part number on your existing board before ordering.

Installation Guide

1. Safety First — Disconnect power at the outdoor disconnect and verify zero voltage with a multimeter.
2. Access — Remove the outdoor unit's control-box service panel.
3. Document — Photograph all wiring, connectors, and defrost timing pin settings before disconnecting.
4. Remove — Label and unplug the low-voltage and sensor connectors, then unscrew the old board from its standoffs.
5. Install — Mount the new board, set the defrost timing pins to match the original, and reconnect every wire and the coil sensor.
6. Test — Restore power and run a heating/defrost cycle to verify defrost initiates and terminates correctly.

Signs You Need a Replacement

• Outdoor coil freezes and never defrosts
• Heat pump blows cold air while in heating mode
• Defrost cycle runs too long or never ends
• Burned, corroded, or unresponsive control board

Shipping & Returns

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