ICP Furnace Control Board Kit for RGS300STEA0AAAA — OEM 1183618 | Ships Today

Overview

This is a genuine OEM control board kit for the ICP / Tempstar / Heil RGS300STEA0AAAA, ICP part number 1183618. The integrated furnace control board is the brain of the system — it sequences the inducer, ignitor, gas valve, and blower, monitors the pressure switch and flame sensor for safety, and stores diagnostic fault codes on its LED. Supplied as a complete kit, it includes the mounting hardware and instructions needed for a clean swap. Control boards fail from heat stress, voltage surges, cracked solder joints, and burnt relays — symptoms range from no response on a call for heat to erratic blower behavior, repeated lockouts, or a flashing fault code with no obvious mechanical cause.

Specifications

Compatibility

A direct OEM replacement kit for ICP, Tempstar, Heil, and Comfortmaker furnaces on the RGS300 platform, including model RGS300STEA0AAAA. Confirm ICP part 1183618 and compare the connector layout to your existing board before installing.

Installation Guide

1. Safety First — Disconnect power and shut off the gas, then verify zero voltage with a multimeter.
2. Access — Remove the blower-compartment service panel.
3. Document — Photograph every connector and harness position before unplugging anything.
4. Remove — Unplug the harnesses, remove the mounting screws, and lift out the old board.
5. Install — Mount the new board from the kit and reconnect each harness exactly per your photos.
6. Test — Restore power and gas, run a full heat cycle, and confirm correct sequencing with no fault codes.

Signs You Need a Replacement

• No response from the furnace on a call for heat.
• Blower runs constantly or fails to start.
• Flashing diagnostic fault code with no mechanical fault found.
• Visible burnt relays, scorch marks, or cracked solder on the board.

Shipping & Returns

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