ICP Furnace Control Board Kit for RGS120LTAB0AAA — Integrated Ignition Control | Ships Today

Overview

This OEM control board kit (part #1183618) is the brain of the ICP Tempstar/Heil RGS120LTAB0AAA gas furnace. The integrated furnace control manages the full heat sequence — inducer startup, igniter warm-up, gas valve timing, flame sensing, and blower on/off delays — while monitoring safety limits and pressure switches. A failed board produces erratic or dead behavior: no response on a call for heat, the blower running constantly, intermittent lockouts, or a furnace that ignites but never starts the blower. Supplied as a complete kit with the correct board revision and mounting hardware so it drops into the original control bracket.

Specifications

Compatibility

Designed for the ICP Tempstar/Heil RGS120LTAB0AAA furnace and other ICP-family models that specify control kit 1183618. Verify the kit number against your unit's wiring diagram before installing.

Installation Guide

1. Safety First — Disconnect power at the switch and breaker and shut off the gas. Verify zero voltage with a multimeter.
2. Access — Remove the furnace control/service panel.
3. Document — Photograph every wire and terminal on the old board before disconnecting anything.
4. Remove — Label and unplug each connector, then remove the board mounting screws.
5. Install — Mount the new board, transfer wiring one connection at a time per your photo, and set any onboard dip switches to match the original.
6. Test — Restore gas and power, run a full heat cycle, and confirm correct ignition, flame sensing, and blower timing. Check the diagnostic LED for fault codes.

Signs You Need a Replacement

• No response from the furnace on a call for heat
• Blower runs continuously or never engages
• Intermittent lockouts or random short-cycling
• Diagnostic LED dark or flashing a hard-fault code

Shipping & Returns

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