ICP Furnace Control Board Kit for RGS303LREA0AAAA — OEM Module | Ships Today

Overview

This is the genuine OEM control board kit (part number 1183618) for the ICP/Tempstar/Heil RGS303LREA0AAAA gas furnace. The integrated furnace control board is the brain of the system: it sequences the inducer motor, igniter, gas valve, and blower, monitors safety limits and flame sense, and manages the ignition timing on every heat call. When the board fails — from power surges, corrosion, failed relays, or burned traces — the furnace may not respond to the thermostat, the blower may run constantly, or the unit may lock out with no error response. This kit includes the replacement board and is supplied as a complete OEM assembly to restore full, reliable control of the furnace.

Specifications

Compatibility

Direct OEM replacement for the ICP RGS303LREA0AAAA furnace and compatible Tempstar, Heil, and Comfortmaker units calling for the 1183618 control board kit. Match the OEM part number on your existing board before ordering.

Installation Guide

1. Safety First — Disconnect electrical power and shut off gas; verify zero voltage with a multimeter.
2. Access — Remove the furnace control/service panel to expose the board.
3. Document — Photograph every wire harness and terminal connection before disconnecting.
4. Remove — Unplug all connectors, remove the mounting screws, and lift out the old board.
5. Install — Mount the new board and reconnect each harness to the matching terminal per your photo.
6. Test — Restore gas and power, run a full heat cycle, and confirm correct ignition and blower sequencing.

Signs You Need a Replacement

• Furnace does not respond to thermostat heat calls.
• Blower runs continuously or fails to start.
• Visible burn marks, corrosion, or scorched relays on the board.
• Intermittent operation or no diagnostic LED activity.

Shipping & Returns

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