ICP Defrost Control Board for YG036G — Heat Pump Timer | Ships Today

Overview

This genuine OEM defrost control board (part number 34332101) is the brain of the defrost cycle on the ICP/Heil/Tempstar YG036G heat pump. The board monitors the defrost thermostat and run time, then commands the reversing valve and outdoor fan to clear frost and ice from the outdoor coil during winter operation. When the board fails, the heat pump can ice over completely, skip defrost entirely, defrost too often, or lose heating output. Typical symptoms include a frozen outdoor coil, no defrost cycle, auxiliary/emergency heat running constantly, scrambled timing, or a unit that simply won't energize the reversing valve and fan on schedule.

Specifications

Compatibility

Direct OEM replacement for the ICP/Heil/Tempstar YG036G heat pump and other units in the family that use the 34332101 defrost control board. Confirm the existing board's part number and connector layout 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 condensing unit service panel to expose the control board.
3. Document — Photograph every wire harness and connector position before unplugging anything.
4. Remove — Unplug the harnesses, release the board's standoffs or mounting screws, and lift the old board out.
5. Install — Seat the new board on the standoffs and reconnect each harness to the matching terminal per your photo.
6. Test — Restore power, run a defrost test (or force defrost), and confirm the reversing valve and outdoor fan respond correctly.

Signs You Need a Replacement

• Outdoor coil freezes solid with no defrost cycle
• Heat pump runs auxiliary/emergency heat constantly
• Defrost runs far too often or at the wrong times
• Reversing valve or outdoor fan won't energize on schedule

Shipping & Returns

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