ICP Furnace Control Board Kit for RGS303HDFA0AAAA — OEM Integrated Control | Ships Today

Overview

This OEM control board kit (part 1183618) is the integrated furnace control that runs your ICP / Tempstar / Heil RGS303HDFA0AAAA. The board manages the entire heating sequence — inducer start, igniter warm-up, gas valve timing, blower on/off delays, and the safety lockouts that monitor limits, flame, and pressure switches. When the board fails you may see no response to a call for heat, short cycling, blower problems, or a unit stuck in lockout with a flashing diagnostic LED. Supplied as a complete kit for a direct OEM replacement, it restores correct, safe sequencing across every cycle.

Specifications

Compatibility

Built for the ICP / Tempstar / Heil RGS303HDFA0AAAA furnace and related RGS-series units that use the same integrated control. Confirm the part number and connector layout against your existing board before ordering.

Installation Guide

1. Safety First — Disconnect power at the switch and breaker, then verify zero voltage with a multimeter.
2. Access — Remove the blower-compartment service panel to reach the control board.
3. Document — Photograph every harness connection and note the dip-switch settings on the old board.
4. Remove — Unplug each connector, remove the mounting screws, and lift out the failed board.
5. Install — Mount the new board, match any dip-switch settings, and reconnect every harness exactly per your photo.
6. Test — Restore power, call for heat, and confirm the full sequence: inducer, igniter, flame, and blower with correct timing.

Signs You Need a Replacement

• No response at all to a thermostat call for heat.
• Furnace short cycles or locks out with a flashing diagnostic LED.
• Blower runs continuously or won't start.
• Visible burnt traces, scorched relays, or corrosion on the board.

Shipping & Returns

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