ICP Defrost Control Board for WCH3362GKA1 — Heat Pump 24V | Ships Today

Overview

This OEM defrost control board (part #1173636) is the brain of the ICP WCH3362GKA1 heat pump's defrost cycle. In heating mode the outdoor coil accumulates frost; this board monitors the defrost thermostat and run time, then reverses the cycle to melt that frost so the unit keeps heating efficiently. It manages the reversing valve, outdoor fan, compressor timing, and the anti-short-cycle delay. When it fails, the heat pump may ice over solid, run continuous or no defrost cycles, blow cold air on a heat call, or fail to switch between heating and cooling. Because it sequences several high- and low-voltage outputs, a failed board can mimic a bad reversing valve, sensor, or contactor — making it a key diagnostic component.

Specifications

Compatibility

Direct OEM replacement for the ICP/Tempstar/Heil WCH3362GKA1 heat pump. Used across matching single-stage ICP-family outdoor heat pumps that share this defrost logic board. Verify the part number and terminal layout against your existing board before installing.

Installation Guide

1. Safety First — Disconnect power at the disconnect and verify zero voltage with a multimeter.
2. Access — Remove the condenser service/control panel.
3. Document — Photograph every wire and connector position on the old board.
4. Remove — Unplug connectors, release the standoffs/screws, and lift out the old board.
5. Install — Seat the new board on the standoffs and reconnect each lead exactly per your photo.
6. Test — Restore power, force a defrost (or jump the test pins) and confirm proper cycle and reversing-valve operation.

Signs You Need a Replacement

• Outdoor coil freezes over and won't defrost
• System blows cold air on a heat call
• Won't switch between heating and cooling modes
• Constant or missing defrost cycles, or no compressor delay

Shipping & Returns

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