ICP Defrost Control Board for YK024G — 24V Heat Pump Defrost | Ships Today

Overview

The ICP defrost control board (OEM #34332101) is the timing and logic module that manages the defrost cycle on your ICP/Heil/Tempstar YK024G heat pump. It monitors coil temperature and run time, then commands the reversing valve and outdoor fan to clear frost from the outdoor coil during cold-weather operation. Operating on 24V control voltage, a failed board is one of the most common causes of an iced-over outdoor unit, a heat pump that runs constantly without keeping up, or auxiliary heat that never shuts off. When this board fails, defrost timing is lost and efficiency drops sharply.

Specifications

Compatibility

Engineered as a direct OEM replacement for the ICP YK024G heat pump and shared across many ICP-family condensing units sold under the Heil, Tempstar, and Comfortmaker brands. Always verify your existing board part number 34332101 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 outdoor unit's control panel cover.
3. Document — Photograph every wire and terminal position before disconnecting anything.
4. Remove — Label and unplug each connector, release the board standoffs or mounting screws, and lift out the old board.
5. Install — Mount the new board on the standoffs and reconnect every wire exactly per your photo.
6. Test — Restore power and confirm the unit completes a normal defrost cycle and returns to heating.

Signs You Need a Replacement

• Outdoor coil ices over and never clears
• Heat pump runs nonstop yet can't maintain temperature
• Auxiliary/emergency heat stays on constantly
• No reversing-valve or defrost-fan response during cold weather

Shipping & Returns

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