ICP Furnace Control Board Kit for RGS121STCA0AAA — OEM Ignition Control | Ships Today

Overview

This genuine OEM control board kit (part 1183618) for the ICP/Tempstar/Heil RGS121STCA0AAA is the brain of the furnace. The integrated furnace control manages the ignition sequence, inducer and blower motor timing, gas valve operation, and all safety interlocks including the limit and pressure switches. When the board fails, the furnace may short cycle, fail to ignite, run the blower continuously, or shut down on safety lockouts. Replacing the board with the correct OEM kit restores reliable, code-compliant operation.

Specifications

Compatibility

Engineered for the ICP RGS121STCA0AAA and related Tempstar, Heil, and Comfortmaker gas furnaces that use this integrated control board. Verify the part number against your existing board before installing, as control boards are model-specific.

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 service panel to expose the control board.
3. Document — Photograph every wire and connector on the board before disconnecting anything.
4. Remove — Unplug all connectors, unscrew the old board, and lift it from its standoffs.
5. Install — Mount the new board and reconnect every harness exactly per your photos.
6. Test — Restore power, run a full heat cycle, and confirm proper ignition, blower, and safety operation.

Signs You Need a Replacement

• Furnace short cycles or won't start on a heat call
• Blower runs continuously or won't run at all
• Repeated safety lockouts with no other fault found
• Visible burn marks, corrosion, or blinking fault codes on the board

Shipping & Returns

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