ICP Control Board Kit for RGS243LEAA0AAAA — OEM Furnace Control 1183618 | Ships Today

Overview

This is the genuine ICP/Tempstar/Heil control board kit (OEM part number 1183618) for the RGS243LEAA0AAAA gas furnace. The integrated furnace control board is the brain of the system — it manages the ignition sequence, monitors safety limits and flame sense, sequences the inducer and blower, and runs onboard self-diagnostics via its LED fault codes. A failed board causes intermittent no-heat, blower problems, lockouts, or a furnace that won't respond to the thermostat at all. This kit includes the board for a complete OEM replacement.

Specifications

Compatibility

Direct OEM replacement for the ICP/Tempstar/Heil/Comfortmaker RGS243LEAA0AAAA furnace and equipment using control board kit 1183618. Confirm the part number and connector layout match your existing board 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 control/blower panel.
3. Document — Photograph every connector and wire harness on the existing board before unplugging anything.
4. Remove — Unplug all harnesses, release the board standoffs/screws, and lift out the old board.
5. Install — Mount the new board and reconnect each harness in its matching position per your photos.
6. Test — Restore power, run a full heat cycle, and confirm no error codes on the diagnostic LED.

Signs You Need a Replacement

• Furnace won't respond to the thermostat or won't start
• Intermittent operation or random lockouts
• Blower or inducer runs continuously or not at all
• Diagnostic LED is dark or flashes a hard-fault code

Shipping & Returns

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