ICP Defrost Control Board for WCH5604GKA200 — Heat Pump | Ships Today

Overview

This is the genuine OEM defrost control board (part number 1173636) for the ICP/Heil/Tempstar WCH5604GKA200 heat pump. The defrost board monitors outdoor coil temperature and run time, then commands a defrost cycle by reversing the unit and energizing auxiliary heat to melt frost off the outdoor coil. It also manages the reversing valve, compressor timing, and fan delays. When the defrost board fails, the heat pump may ice over solid in cold weather, fail to switch between heating and cooling, short-cycle, or lose heating output entirely.

Specifications

Compatibility

Factory-correct replacement for the ICP WCH5604GKA200 heat pump and matching Heil, Tempstar, and Comfortmaker outdoor units. Match the board's connector layout and defrost timing pins to your original before installing.

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 connector and the defrost timer pin setting before disconnecting.
4. Remove — Unplug each harness, release the board standoffs, and lift out the old board.
5. Install — Seat the new board, set the defrost timer pin to match, and reconnect every harness per your photo.
6. Test — Restore power and confirm normal heating, then force a defrost cycle to verify reversing-valve and fan operation.

Signs You Need a Replacement

• Outdoor coil ices over and never defrosts
• Heat pump won't switch between heat and cool
• No auxiliary heat during defrost
• Short-cycling or no compressor operation

Shipping & Returns

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