ICP Furnace Control Board Kit for RGS300SEFA0AAAA — OEM 1183618 | Ships Today

Overview

This is a genuine OEM control board kit, ICP part number 1183618, for the ICP, Tempstar, and Heil RGS300SEFA0AAAA gas furnace. The integrated furnace control board is the brain of the system: it sequences the inducer, igniter, gas valve, and blower, monitors safety limits and flame sense, and reports diagnostic fault codes. When the board fails, symptoms range from a completely dead furnace to erratic cycling, blower issues, or repeated lockouts with no clear single-component cause.

Supplied as a kit, this replacement includes the components needed for a clean swap so you can restore full, code-compliant furnace operation rather than chasing intermittent faults.

Specifications

Compatibility

Designed for the ICP / Tempstar / Heil RGS300SEFA0AAAA and related RGS-series gas furnaces that specify OEM kit 1183618. Confirm the board part number printed on your existing control before ordering.

Installation Guide

1. Safety First — Disconnect power at the switch and breaker; verify zero voltage with a multimeter.
2. Access — Remove the furnace control/blower panel to reach the board.
3. Document — Photograph every connector, harness, and terminal before unplugging anything.
4. Remove — Disconnect all plugs and leads, then unscrew the old board from its standoffs.
5. Install — Mount the new board and reconnect each harness in the same position per your photos.
6. Test — Restore power, run a full heat cycle, and confirm correct sequencing with no fault codes.

Signs You Need a Replacement

• Furnace completely dead with no response to a heat call
• Erratic cycling, short-cycling, or random lockouts
• Blower or inducer that won't start or won't stop
• Persistent diagnostic fault LED pointing to the control

Shipping & Returns

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