ICP Defrost Control Board for YD042GA — 24V Heat Pump Board | Ships Today

Overview

This genuine OEM defrost control board (part number 34330100) is the brain of the ICP YD042GA heat pump's outdoor unit. It manages the defrost cycle by monitoring coil temperature and run time, energizing the reversing valve, controlling the compressor and outdoor fan, and timing the defrost interval so frost is cleared from the outdoor coil during heating season. When this board fails, the heat pump may ice over, fail to defrost, run constantly, or lose heating or cooling entirely. Replacing a faulty board restores proper defrost timing and protects the compressor.

Specifications

Compatibility

Designed for the ICP YD042GA and matching Tempstar, Heil, and Comfortmaker heat pumps using this defrost control board. Confirm your existing board's part number and terminal layout before ordering, as defrost boards vary by model series.

Installation Guide

1. Safety First — Disconnect power at the outdoor disconnect and verify zero voltage with a multimeter.
2. Access — Remove the condenser control-panel cover.
3. Document — Photograph every wire and connector on the existing board before disconnecting.
4. Remove — Unplug the harnesses, note the defrost timing pin setting, and unscrew the board from its standoffs.
5. Install — Mount the new board, set the defrost timing jumper to match the original, and reconnect all harnesses per your photo.
6. Test — Restore power and verify the unit runs in heat and cool and initiates a defrost cycle.

Signs You Need a Replacement

• Outdoor coil ices over and will not defrost
• Reversing valve does not switch between heat and cool
• Compressor or fan won't start despite a thermostat call
• Visible burn marks or scorched traces on the board

Shipping & Returns

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