ICP Furnace Control Board Kit for RGS303SSFA0AAAA — OEM | Ships Today

Overview

This is the genuine OEM control board kit (part number 1183618) for the ICP / Tempstar / Heil RGS303SSFA0AAAA gas furnace. The integrated furnace control board is the brain of the system — it sequences the inducer, igniter, gas valve, and blower, monitors safety inputs like the pressure switch and limit, and manages flame sensing and fault diagnostics. When the board fails, the furnace may not respond to the thermostat, lock out on false faults, fail to energize the blower, or behave erratically. This kit includes the matched replacement board for a direct OEM swap.

Specifications

Compatibility

Built for the ICP-manufactured RGS303SSFA0AAAA furnace and equivalent Tempstar, Heil, and Comfortmaker models. Verify the board part number and connector layout against your existing control before installing.

Installation Guide

1. Safety First — Disconnect power at the switch and breaker, then verify zero voltage with a multimeter.
2. Access — Remove the control/blower compartment service panel.
3. Document — Photograph every harness plug and wire location before disconnecting; note any dip-switch or jumper settings.
4. Remove — Unplug each connector, release the board standoffs/screws, and lift out the old board.
5. Install — Mount the new board, transfer any settings, and reconnect each harness per your photo.
6. Test — Restore power and run a full heat cycle, confirming inducer, ignition, gas valve, and blower sequence correctly with no fault codes.

Signs You Need a Replacement

• Furnace completely unresponsive to thermostat calls.
• Repeated or false fault/lockout codes on the diagnostic LED.
• Blower or inducer fails to energize in the correct sequence.
• Burnt spots, corrosion, or scorched relays visible 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.