ICP Furnace Control Board for RGS303HSFA0AAAA — OEM Kit 1183618 | Ships Today

Overview

This OEM control board kit (part number 1183618) is the integrated furnace control (IFC) brain of the ICP/Heil/Tempstar RGS303HSFA0AAAA gas furnace. It manages the ignition sequence, blower and inducer timing, safety lockouts, and communication between the thermostat, igniter, gas valve, and limit switches. A failed control board can leave the furnace completely dead, stuck in lockout, or short-cycling. Boards typically fail from power surges, cracked solder joints, blown onboard fuses, or burned relay contacts. This kit ships with the matched OEM board so the furnace's diagnostic LED, timings, and safety logic behave exactly as designed.

Specifications

Compatibility

Direct-fit replacement for the ICP/Heil/Tempstar/Comfortmaker RGS303HSFA0AAAA gas furnace. Confirm OEM part number 1183618 and the board's connector layout against your existing control before ordering.

Installation Guide

1. Safety First — Disconnect power at the furnace switch and breaker, then verify zero voltage with a multimeter.
2. Access — Remove the blower compartment service panel.
3. Document — Photograph every wire harness and terminal position before disconnecting anything.
4. Remove — Unplug all connectors, remove the mounting screws, and lift out the old board.
5. Install — Mount the new board, transfer connectors one at a time per your photos, and set any dip switches/jumpers to match the original.
6. Test — Restore power, watch the diagnostic LED, and run a full heat cycle to confirm proper ignition and blower operation.

Signs You Need a Replacement

• Furnace is completely unresponsive with no diagnostic LED.
• Repeated lockouts or fault codes that persist after replacing igniter/flame sensor.
• Blower or inducer runs continuously or fails to start.
• Visible burn marks, blown fuse, or corroded relays on the board.

Shipping & Returns

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