ICP Furnace Control Board Kit for RGS303LDEA0AAAA — OEM 1183618 | Ships Today

Overview

This is a genuine OEM control board kit (part number 1183618) for the ICP / Tempstar / Heil RGS303LDEA0AAAA gas furnace. The integrated furnace control board is the brain of the system — it manages the ignition sequence, sequences the inducer and blower, monitors the flame sensor and safety limits, and controls timing and diagnostics. A failed board causes erratic or no operation: no ignition, blower that won't start or won't stop, fault codes, or a furnace that is completely dead. Supplied as a kit for a complete, correct replacement.

Specifications

Compatibility

Engineered for the ICP-built RGS303LDEA0AAAA furnace and used across the Tempstar, Heil and Comfortmaker family. Confirm the OEM number 1183618 against your existing board and verify the connector layout before installing — control boards are model-specific.

Installation Guide

1. Safety First — Disconnect power at the furnace switch and breaker, then verify zero voltage with a multimeter.
2. Access — Remove the control/blower compartment service panel.
3. Document — Photograph every plug and wire harness on the board before disconnecting; note any onboard jumper or DIP settings.
4. Remove — Unplug each connector, remove the mounting screws/standoffs, and lift out the old board.
5. Install — Mount the new board, transfer any jumper settings, and reconnect every harness exactly per your photo.
6. Test — Restore power, call for heat, and watch a full cycle: inducer, igniter, flame proof, and blower should sequence correctly with no fault codes.

Signs You Need a Replacement

• Furnace completely dead with no diagnostic LED activity
• Blower or inducer won't start, or won't shut off
• Repeated lockouts or erratic ignition sequencing
• Visible scorching, burned traces, or failed 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.