ICP Control Board Kit for RGS303SDFA0AAAA — OEM 1183618 | Ships Today

Overview

This is a genuine OEM control board kit, ICP part number 1183618, for the ICP / Tempstar / Heil RGS303SDFA0AAAA 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 safety circuits such as limit and pressure switches, and reads the thermostat call. The kit includes the board and mounting hardware needed for a complete replacement. When the board fails, the furnace may fail to ignite, lock out, run the blower continuously, throw repeated fault codes, or go completely dead even with power present.

Specifications

Compatibility

Direct OEM replacement for the ICP / Tempstar / Heil RGS303SDFA0AAAA gas furnace and related ICP-family units that use the 1183618 control board kit. Match the part number on 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 furnace service panel to reach the control board.
3. Document — Photograph every harness connector and wire location on the board before disconnecting.
4. Remove — Unplug each harness, release the board from its standoffs, and lift it out.
5. Install — Mount the new board with the included hardware and reconnect every harness exactly per your photos.
6. Test — Restore power, run a full heat cycle, and confirm correct ignition, blower timing, and no fault codes.

Signs You Need a Replacement

• Furnace is completely dead despite confirmed power.
• No ignition or repeated lockouts with no other faulty component.
• Blower runs continuously or will not start.
• Repeated or erratic LED fault codes from the board.

Shipping & Returns

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