ICP Control Board Circuit Board for WPA4604000RKB1 — OEM 1178001 | Ships Today

Overview

This OEM circuit control board (OEM part 1178001) is the electronic brain of your ICP/Tempstar/Heil WPA4604000RKB1 system. It sequences the ignition cycle, controls blower and inducer timing, monitors safety inputs like limit and pressure switches, and routes 24-volt signals between the thermostat and the system's major components. Control boards fail from voltage spikes, heat stress, moisture, and burnt relays. Symptoms of a failing board include no response on a call for heating or cooling, blower or inducer that won't start or won't shut off, blinking diagnostic fault codes, intermittent operation, and visible burn marks, corrosion, or a cracked relay on the board.

Specifications

Compatibility

Direct OEM replacement for the ICP/Tempstar/Heil WPA4604000RKB1 packaged unit and related ICP-family equipment using this control board. Match the board's part number and connector layout to your existing board 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-compartment service panel.
3. Document — Photograph every harness plug and wire position on the old board.
4. Remove — Unplug all connectors and remove the mounting screws or standoffs holding the board.
5. Install — Mount the new board and reconnect each harness to the matching connector per your photo.
6. Test — Restore power, run a heating and cooling cycle, and confirm correct sequencing with no fault codes.

Signs You Need a Replacement

• No response from the system on a call for heat or cool.
• Blower or inducer won't start or won't shut off.
• Blinking diagnostic fault codes on the board LED.
• Visible burn marks, corrosion, or a damaged relay.

Shipping & Returns

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