ICP Control Board for WPA3604000RKC1 — OEM Defrost Circuit Board | Ships Today

Overview

This OEM circuit board (part number 1178001) is the main control board for the ICP/Tempstar/Heil WPA3604000RKC1 heat pump. It manages the defrost cycle, sequences the contactor and reversing valve, and coordinates the low-voltage logic that runs the outdoor unit. When the board fails, the heat pump may stop defrosting (causing coil icing), fail to switch between heating and cooling, or shut down entirely with no response to a thermostat call. Installing the correct OEM board restores reliable, factory-spec operation.

Specifications

Compatibility

Direct OEM replacement for the ICP/Tempstar/Heil WPA3604000RKC1. Confirm the printed part number 1178001 and the board's terminal layout match your existing board before ordering, as ICP uses several board revisions across its heat pump line.

Installation Guide

1. Safety First — Disconnect power at the outdoor disconnect and verify zero voltage with a multimeter.
2. Access — Remove the electrical service panel.
3. Document — Photograph every wire and connector on the board before removing anything.
4. Remove — Unplug the harnesses, release the board standoffs or screws, and lift out the old board.
5. Install — Seat the new board on its standoffs and reconnect each harness exactly per your photo.
6. Test — Restore power and verify a normal startup, a cooling/heating call, and a forced or timed defrost cycle.

Signs You Need a Replacement

• Outdoor coil ices over because defrost never initiates
• Unit will not start or ignores thermostat calls
• Reversing valve fails to switch between heat and cool
• Visible burn marks, swollen capacitors, or corroded traces on the board

Shipping & Returns

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