ICP Control Board for WPA4364000RKB1 — OEM Circuit Board | Ships Today

Overview

This is the OEM control circuit board (Part #1178001) for the ICP WPA4364000RKB1 unit. The control board is the brain of the system — it manages startup sequencing, relay timing, safety lockouts, and (on heat pump models) defrost cycles based on input from the thermostat and sensors. When a control board fails, you may see a unit that won't respond to thermostat calls, erratic cycling, components that energize at the wrong time, or diagnostic LED fault codes. Boards commonly fail from power surges, lightning, moisture, or burned relays and traces. Replacing the board restores correct, safe sequencing of the entire unit.

Specifications

Compatibility

Direct factory replacement for the ICP WPA4364000RKB1 unit and shared across the ICP brand family — Tempstar, Heil, Comfortmaker, Arcoaire, and KeepRite. Match the board part number and connector layout to your existing board before installing.

Installation Guide

1. Safety First — Disconnect power and verify zero voltage with a multimeter.
2. Access — Remove the control compartment panel.
3. Document — Photograph every connector and wire harness position before disconnecting.
4. Remove — Unplug the connectors, release the standoffs/screws, and lift out the old board.
5. Install — Seat the new board on its standoffs and reconnect every harness exactly per your photo.
6. Test — Restore power, call for operation, and verify correct sequencing with no fault codes on the diagnostic LED.

Signs You Need a Replacement

• Unit does not respond to thermostat calls.
• Diagnostic LED flashing a fault/error code.
• Erratic cycling or components energizing out of sequence.
• Visible burn marks, scorched relays, or corrosion on the board.

Shipping & Returns

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