ICP Furnace Control Board for RGS300LSAA0AAAA — OEM Kit 1183618 | Ships Today

Overview

The OEM Control Board Kit (part number 1183618) is the integrated furnace control that runs every operating sequence of your ICP Tempstar Heil RGS300LSAA0AAAA gas furnace. It manages ignition timing, inducer and blower relay logic, flame sensing, and safety lockouts. A failed board produces a wide range of complaints — no ignition, repeated lockouts, short-cycling, a blower that won't stop, or blinking diagnostic fault codes on the onboard LED. Because the board coordinates all other components, its failure can imitate a bad igniter, gas valve, or motor, so confirming the board directly avoids wasted parts. This factory kit ships with the board and the hardware needed for a clean, plug-in replacement.

Specifications

Compatibility

This board kit is designed for the ICP Tempstar Heil RGS300LSAA0AAAA furnace and related RGS300-series gas furnaces sharing the same control platform. Confirm your existing board's part number or markings before installing.

Installation Guide

1. Safety First — Disconnect power at the furnace switch and breaker, then verify zero voltage with a multimeter.
2. Access — Remove the furnace blower-compartment service panel.
3. Document — Photograph every wire and connector before disconnecting anything.
4. Remove — Unplug each harness, release the mounting clips/screws, and lift out the old control board.
5. Install — Mount the new board on the supplied standoffs and reconnect every harness exactly per your photo.
6. Test — Restore power, run a heat cycle, and confirm proper ignition, blower operation, and no fault codes.

Signs You Need a Replacement

• Furnace will not ignite or repeatedly locks out
• Blower or inducer runs constantly or not at all
• Flashing error/diagnostic codes on the board LED
• Visible scorching, burn marks, 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.