ICP Defrost Control Board for YK018GC2 — 24V Heat Pump Defrost | Ships Today

Overview

The ICP defrost control board (OEM #34332101) governs the defrost cycle on your ICP/Heil/Tempstar YK018GC2 heat pump. It tracks outdoor coil temperature and accumulated run time, then commands the reversing valve and outdoor fan to melt frost off the outdoor coil in cold weather. Running on 24V control voltage, this board is critical to winter heat-pump performance — a failure typically shows up as a frozen outdoor unit, a system that runs constantly without keeping up, or expensive auxiliary heat that never cycles off.

Specifications

Compatibility

Direct OEM replacement for the ICP YK018GC2 heat pump and many ICP-family condensing units sold under the Heil, Tempstar, and Comfortmaker brands. Confirm your existing board carries 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.
4. Remove — Label and unplug each connector, release the board standoffs or 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 won't clear
• Heat pump runs nonstop but can't maintain temperature
• Auxiliary/emergency heat stays energized constantly
• No defrost-fan or reversing-valve response in 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.