ICP Furnace Control Board for RGS243LREA0AAAA — OEM Kit 1183618 | Ships Today

Overview

This OEM Furnace Control Board (kit 1183618) is the integrated ignition and sequencing brain for the ICP / Tempstar / Heil RGS243LREA0AAAA gas furnace. It manages the call for heat from the thermostat, sequences the inducer motor, hot surface igniter, gas valve, and blower, and continuously monitors flame and safety switches. When this board fails the furnace will typically lock out, short cycle, ignore thermostat calls, or run the blower without heat. Replacing it with the factory board restores correct ignition timing and full safety supervision.

Specifications

Compatibility

Engineered as a direct-fit replacement for the ICP / Tempstar / Heil RGS243LREA0AAAA gas furnace and closely related RGS-series units that originally shipped with control kit 1183618. Always match your existing board's 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 wire harness and connector position on the old board before disconnecting.
4. Remove — Unplug each connector, release the board standoffs/screws, and lift out the failed control board.
5. Install — Mount the new 1183618 board on the standoffs 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 fails to 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.