ICP Furnace Control Board Kit for RGS303SDEA0AAAA — OEM Replacement | Ships Today

Overview

This genuine OEM control board kit, part number 1183618, is the integrated furnace control for the ICP / Tempstar / Heil RGS303SDEA0AAAA. The board is the brain of the furnace: it manages the ignition sequence, inducer and blower timing, safety interlocks, and self-diagnostic fault codes. The kit includes the mounting hardware and connectors needed for a complete replacement. When a control board fails, the furnace may be completely dead, lock out on ignition, fail to start the blower or inducer, or flash diagnostic fault codes that don't clear.

Specifications

Compatibility

Direct-fit for the ICP / Tempstar / Heil RGS303SDEA0AAAA and related RGS-series furnaces that specify control board kit 1183618. Confirm the board layout, connector positions, and part number against your existing board before ordering.

Installation Guide

1. Safety First — Disconnect power at the breaker and verify zero voltage with a multimeter.
2. Access — Remove the furnace control/blower compartment panel.
3. Document — Photograph every harness connector and wire location on the existing board before disconnecting.
4. Remove — Unplug each connector, remove the mounting screws or standoffs, and lift out the old board.
5. Install — Mount the new board with the included hardware and reconnect every harness exactly per your photo.
6. Test — Restore power, run a full heat cycle, and confirm proper ignition, blower operation, and no fault codes.

Signs You Need a Replacement

• Furnace is completely unresponsive with power present
• Repeated ignition lockouts or no inducer/blower start
• Persistent diagnostic fault codes that won't clear
• Visible burn marks, corrosion, or damaged relays 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.