ICP Furnace Control Board Kit for RGS121LDCA0AAA — 24V Integrated Ignition Control | Ships Today

Overview

This is the genuine OEM control board kit (OEM #1183618) for the ICP/Heil/Tempstar RGS121LDCA0AAA gas furnace. The integrated furnace control board is the brain of the system — it sequences the inducer, igniter, gas valve, and blower, monitors safety limits and flame, and manages the 24V thermostat call. When the board fails, the furnace may lock out, short-cycle, run the blower continuously, or refuse to start at all. This kit ships with the board and the hardware needed for a clean replacement, restoring proper ignition timing and safety operation.

Specifications

Compatibility

Direct OEM replacement for the ICP/Heil/Tempstar RGS121LDCA0AAA furnace and other models that specify control board kit 1183618. Replace with an identical board to preserve correct ignition and blower timing.

Installation Guide

1. Safety First — Disconnect power at the furnace switch and breaker, then verify zero voltage with a multimeter.
2. Access — Remove the blower compartment service panel.
3. Document — Photograph every wire and connector on the existing board before disconnecting anything.
4. Remove — Unplug the harness connectors and remove the board mounting screws.
5. Install — Mount the new board and reconnect each harness exactly per your photos.
6. Test — Restore power and run a full heat and blower cycle to confirm correct sequencing.

Signs You Need a Replacement

• Furnace fails to start or locks out with a fault/error blink code
• Blower runs constantly or never starts
• Short-cycling or erratic ignition sequencing
• Visible burnt traces, scorch marks, or a blown fuse on the board

Shipping & Returns

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