ICP Furnace Control Board Kit for RGS300LFAA0AAAA — OEM 1183618 | Ships Today

Overview

This is the genuine OEM control board kit (part number 1183618) for the ICP Tempstar Heil RGS300LFAA0AAAA gas furnace. The integrated furnace control board is the brain of the unit — it manages the ignition sequence, sequences the inducer and blower motors, monitors limit and pressure switches, controls gas valve timing, and runs the self-diagnostic flash codes. When the board fails, the furnace may show no response at the thermostat, run blower or inducer continuously, fail to ignite, or display erratic fault codes. This kit ships as a complete control assembly for a clean, direct replacement that restores full furnace operation and safety monitoring.

Specifications

Compatibility

This control board kit is the factory-specified replacement for the ICP Tempstar Heil RGS300LFAA0AAAA furnace. Because ICP manufactures equipment under the Tempstar, Heil, Comfortmaker, and related badges, part 1183618 also services equivalent furnace models across those lines. Match the part number on your existing board before ordering to ensure correct fitment.

Installation Guide

1. Safety First — Disconnect power at the furnace switch and breaker and shut off the gas. Verify zero voltage with a multimeter.
2. Access — Remove the furnace blower-compartment service panel to expose the control board.
3. Document — Photograph every wire and connector on the board before disconnecting; label harnesses if needed.
4. Remove — Unplug all connectors, remove the mounting screws or standoffs, and lift out the old board.
5. Install — Mount the new board on the same standoffs and reconnect every harness exactly as photographed.
6. Test — Restore gas and power, run a full heat cycle, and confirm normal flash-code status, proper blower/inducer operation, and reliable ignition.

Signs You Need a Replacement

• Furnace completely unresponsive to thermostat calls
• Inducer or blower runs continuously or won't start
• Erratic or no diagnostic flash codes from the board
• Visible burn marks, corrosion, or failed relays on the board

Shipping & Returns

Ships same day on orders placed before 3 PM CST. 30-day hassle-free returns. Backed by the National HVAC Parts fitment guarantee — if it doesn't fit, we make it right.