ICP Furnace Control Board Kit for RGS121HRCA0AAA — Integrated Ignition | Ships Today

Overview

This OEM control board kit (part 1183618) is the brain of your ICP Tempstar Heil RGS121HRCA0AAA gas furnace. The integrated furnace control manages the entire heating sequence — igniter timing, gas valve operation, inducer and blower relays, flame sensing, and safety lockouts — while monitoring limit and pressure switches. When the board fails, the furnace may show no response on a heat call, blink an error code, fail to energize the igniter or blower, or short-cycle. The kit includes the replacement board with mounting hardware for a complete swap.

Specifications

Compatibility

Designed for the ICP / Tempstar / Heil / Comfortmaker RGS121HRCA0AAA furnace and related models using the same integrated control. Confirm the board part number and connector layout against your existing unit before installing.

Installation Guide

1. Safety First — Disconnect power at the furnace switch and breaker; verify zero voltage with a multimeter.
2. Access — Remove the control-compartment service panel.
3. Document — Photograph every plug and harness connection before disconnecting.
4. Remove — Unplug each connector, remove the mounting screws, and lift out the old board.
5. Install — Mount the new board, transfer any jumpers, and reconnect each harness exactly per your photo.
6. Test — Restore power and confirm a full ignition sequence: inducer, igniter, gas valve, and blower.

Signs You Need a Replacement

• No response from the furnace on a heat call
• Fault/error LED blink codes on the board
• Igniter, inducer, or blower won't energize
• Repeated short-cycling or random lockouts

Shipping & Returns

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