ICP Control Board for WPA4364000RKA1 — OEM Circuit Board | Ships Today

Overview

This OEM control circuit board (part #1178001) is the brain of your ICP WPA4364000RKA1 unit, coordinating the compressor contactor, condenser fan, and low-voltage thermostat inputs. It manages timing, safety lockouts, and sequencing so the system starts, runs, and protects itself correctly. When the board fails, the symptoms are erratic: the unit won't respond to a cooling call, components energize at the wrong time, the system short-cycles, or you find visibly burnt traces, scorched relays, or a fault code on the diagnostic LED. Because the board ties every major component together, a faulty one can mimic a bad contactor, motor, or sensor — making accurate diagnosis before replacement essential.

Specifications

Compatibility

Direct-fit replacement for the ICP WPA4364000RKA1 unit and compatible Heil, Tempstar, and Comfortmaker systems that use this control board. Match the board's part number and connector layout to your original before installing.

Installation Guide

1. Safety First — Disconnect power at the disconnect and breaker, then verify zero voltage with a multimeter.
2. Access — Remove the control/access panel to expose the board.
3. Document — Photograph every connector and wire location before unplugging anything.
4. Remove — Unplug the harnesses, release the board standoffs/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, call for cooling, and confirm correct sequencing and a clear diagnostic LED.

Signs You Need a Replacement

• Unit won't respond to a thermostat cooling call
• Components energize out of sequence or short-cycle
• Burnt traces, scorched relays, or a fault code on the board LED
• Intermittent operation that doesn't trace to any single component

Shipping & Returns

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