ICP Control Board for RGS120LDBA0AAA — OEM Kit 1183618 | Ships Today

Overview

This is the genuine OEM integrated furnace control board kit (part number 1183618) for the ICP/Tempstar/Heil RGS120LDBA0AAA 120,000 BTU gas furnace. The control board is the brain of the furnace — it manages the ignition sequence, monitors safety limits and pressure switches, sequences the inducer and blower motors, and times the gas valve and hot surface igniter. It operates on a 24V control circuit and includes onboard diagnostic LED fault codes. When this board fails, the furnace typically will not start, locks out on ignition, short-cycles, or runs the blower continuously.

Specifications

Compatibility

Engineered as a direct OEM replacement for the ICP/Tempstar/Heil RGS120LDBA0AAA gas furnace and other RGS-series models that originally shipped with control board 1183618. Always confirm your existing board part number before ordering.

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 and connector position on the old board before disconnecting.
4. Remove — Unplug the wiring harnesses, release the board standoffs, and lift out the failed control board.
5. Install — Mount the new board on the standoffs and reconnect each harness exactly per your photo.
6. Test — Restore power, initiate a heat call, and confirm a clean ignition sequence and blower operation.

Signs You Need a Replacement

• Furnace completely dead with no inducer or igniter response.
• Repeated ignition lockout or flashing diagnostic fault codes.
• Blower runs constantly or fails to start.
• Visible burn marks, cracked relays, or corrosion on the board.

Shipping & Returns

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