ICP Furnace Control Board Kit for RGS121HTCB0AAA — OEM Integrated Control | Ships Today

Overview

This OEM control board kit (OEM 1183618) is the integrated furnace control (IFC) that runs every sequence on your ICP Tempstar/Heil RGS121HTCB0AAA gas furnace. It manages the ignition sequence, monitors flame and safety limits, energizes the inducer and igniter, opens the gas valve, controls blower timing, and coordinates with the thermostat. When the board fails, the furnace may lock out, fail to ignite, run the blower continuously, or show diagnostic fault codes on the board's LED. This kit ships with the components needed for a complete board replacement.

Specifications

Compatibility

Built for the ICP Tempstar/Heil RGS121HTCB0AAA and matched RGS-series gas furnaces using this integrated control. Match the OEM part number on your existing board before ordering, as control boards are model-specific.

Installation Guide

1. Safety First — Disconnect power and gas; verify zero voltage with a multimeter.
2. Access — Remove the control-compartment service panel.
3. Document — Photograph every harness and terminal connection on the old board.
4. Remove — Unplug each connector, release the board standoffs/screws, and lift out the old control.
5. Install — Seat the new board on its standoffs and reconnect every harness exactly per your photo; set any DIP switches to match the original.
6. Test — Restore power and gas, then run a full heat cycle and confirm no fault codes on the LED.

Signs You Need a Replacement

• Furnace dead with no LED activity, or a flashing fault code
• No ignition sequence — inducer, igniter, or gas valve never energizes
• Blower runs constantly or won't run at all
• Intermittent operation or repeated safety lockouts

Shipping & Returns

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