ICP Control Board for WPH4424000RKB1 — OEM Circuit Board | Ships Today

Overview

This genuine OEM control board (part #1178001) is the electronic brain of the ICP/Tempstar/Heil WPH4424000RKB1 heat pump. It manages defrost timing, reversing-valve operation, compressor and fan sequencing, time delays, and safety lockouts based on inputs from the thermostat and sensors. When the board fails, the unit may not start at all, skip defrost (causing outdoor coil icing), short-cycle, run the fan or compressor continuously, or throw erratic fault codes. Power surges, moisture, corroded relays, and burned traces are common causes. Installing the correct OEM board restores reliable sequencing and protects the compressor from improper cycling.

Specifications

Compatibility

Direct OEM replacement for the ICP/Tempstar/Heil WPH4424000RKB1. Match the board part number and connector layout to your existing board before installing — control boards are model-specific.

Installation Guide

1. Safety First — Disconnect power at the disconnect and breaker; verify zero voltage with a multimeter.
2. Access — Remove the electrical/control access panel.
3. Document — Photograph every connector and wire position before unplugging anything.
4. Remove — Unplug the harnesses, release the standoffs/screws, and lift out the old board.
5. Install — Mount the new board on the same standoffs and reconnect each harness exactly per your photo.
6. Test — Restore power, run a heat and cool call, and confirm proper sequencing and defrost operation.

Signs You Need a Replacement

• Unit completely dead with 24V present at the board
• Outdoor coil ices up (no defrost cycle)
• Compressor or fan short-cycles or won't sequence
• Visible burn marks, corrosion, or melted relays on the board

Shipping & Returns

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