ICP Furnace Control Board for RGS300LFFA0AAAA — OEM Kit 1183618 | Ships Today

Overview

The OEM Control Board Kit (part #1183618) is the integrated furnace control (IFC) for the ICP / Heil / Tempstar RGS300LFFA0AAAA gas furnace. This board manages the ignition sequence, blower and inducer timing, flame sensing, gas valve actuation, and built-in safety lockouts. When it fails, the furnace typically will not ignite, short-cycles, runs the blower continuously, or flashes diagnostic fault codes on the onboard LED. Replacing the board with a genuine OEM kit restores reliable, code-correct operation and preserves the factory diagnostics.

Specifications

Compatibility

Designed as the factory replacement for the RGS300LFFA0AAAA gas furnace and shared ICP-family platforms sold under the Heil, Tempstar, and Comfortmaker brands. Always confirm the part number stamped on your existing board before ordering.

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 on the old board before disconnecting anything.
4. Remove — Unplug the wiring harnesses, release the board standoffs/screws, and lift out the failed control board.
5. Install — Mount the new OEM board, reconnect each harness exactly per your photos, and seat all locking tabs.
6. Test — Restore power and run a full heat cycle; confirm ignition, blower timing, and a steady status LED with no fault codes.

Signs You Need a Replacement

• Furnace will not ignite or fails to start a heat call
• Blower runs constantly or never engages
• Repeated short-cycling or lockout on the diagnostic LED
• Erratic operation after a power surge or moisture exposure

Shipping & Returns

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