ICP Furnace Control Board for RGS243LRAA0AAAA — OEM Kit 1183618 | Ships Today

Overview

This OEM Furnace Control Board (kit 1183618) is the integrated ignition and sequencing control for the ICP / Tempstar / Heil RGS243LRAA0AAAA gas furnace. It interprets the thermostat call for heat, sequences the inducer motor, hot surface igniter, gas valve, and blower, and supervises flame sense and the safety circuit. A failed board causes ignition lockouts, short cycling, no response to the thermostat, or blower-only operation with no heat. The factory board restores correct timing and full safety monitoring.

Specifications

Compatibility

Direct-fit replacement for the ICP / Tempstar / Heil RGS243LRAA0AAAA gas furnace and related RGS-series units originally equipped with control kit 1183618. Confirm the existing board part number and connector layout before installing.

Installation Guide

1. Safety First — Disconnect power at the furnace switch and breaker, and verify zero voltage with a multimeter.
2. Access — Remove the furnace blower-compartment service panel.
3. Document — Photograph every harness and connector position on the old board before disconnecting.
4. Remove — Unplug each connector, release the standoffs/screws, and lift out the failed board.
5. Install — Mount the new 1183618 board and reconnect each harness exactly per your photo.
6. Test — Restore power, run a heat call, and confirm correct inducer, igniter, gas valve, and blower sequencing with no fault codes.

Signs You Need a Replacement

• Furnace ignores thermostat calls or won't start a heat cycle
• Repeated lockouts or blinking diagnostic fault codes on the board LED
• Blower runs continuously or never engages during heating
• Visible burn marks, corroded relays, or scorched traces on the board

Shipping & Returns

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