ICP Furnace Control Board Kit for RGS303SRFA0AAAA — Integrated Control | Ships Today

Overview

This genuine OEM control board kit (part number 1183618) is the integrated furnace control that manages the entire heating sequence on ICP, Heil, and Tempstar gas furnaces including the RGS303SRFA0AAAA. The board takes the thermostat call, runs the inducer and pressure-switch proving, energizes the igniter and gas valve, times the blower on and off delays, and monitors flame and safety limits. It is the brain of the furnace — when it fails, the equipment cannot operate safely or reliably. The kit ships with the mounting hardware and instructions needed for a complete replacement.

Control boards fail from power surges, overheating, corrosion, cracked solder joints, and burned relays. Symptoms range from a completely dead furnace to erratic blower behavior, ignition lockouts that are not caused by the igniter or flame sensor, and diagnostic LED fault codes that do not clear after the obvious components are checked. Installing the correct OEM board restores the factory control sequence and the built-in safety logic.

Specifications

Compatibility

Direct OEM replacement for the RGS303SRFA0AAAA and other ICP / Heil / Tempstar / Comfortmaker gas furnaces specifying the 1183618 control board kit. Confirm the board part number and connector layout against your existing control before ordering.

Installation Guide

1. Safety First — Disconnect power at the furnace switch and breaker, shut off the gas, and verify zero voltage before touching the board.
2. Access — Remove the furnace control-compartment service panel to expose the board.
3. Document — Photograph every connector and wire location on the old board before disconnecting anything — this is the most important step on a control board swap.
4. Remove — Unplug each harness connector, remove the mounting screws, and lift out the old board.
5. Install — Mount the new board with the supplied hardware and reconnect each connector to the matching position per your photos.
6. Test — Restore gas and power, run a full heat cycle, and confirm proper inducer, ignition, gas valve, and blower sequencing with no fault codes on the diagnostic LED.

Signs You Need a Replacement

• Furnace completely dead with no response to a thermostat call
• Erratic or continuous blower operation outside normal timing
• Ignition lockouts not resolved by replacing the igniter or flame sensor
• Diagnostic LED fault codes pointing to the control, or visible burn marks and corrosion on the board

Shipping & Returns

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