ICP Furnace Control Board Kit for RGS303HTAA0AAAA — OEM 1183618 | Ships Today

Overview

The ICP control board kit (OEM part 1183618) is the integrated furnace control that runs your ICP, Heil, and Tempstar RGS303HTAA0AAAA gas furnace. It sequences the ignition, manages the inducer and blower motors, monitors the limit and pressure safety switches, and communicates fault codes through its diagnostic LED. When this board fails, the furnace may go completely dead, fail to ignite, run the blower continuously, short-cycle, or flash an error code. A failed board is one of the most common causes of a no-heat call. This kit ships as a genuine OEM assembly with the correct firmware and connectors for a direct, plug-in replacement.

Specifications

Compatibility

This control board kit is a direct OEM fit for the ICP/Heil/Tempstar RGS303HTAA0AAAA gas furnace and related RGS-series models that use the same control platform. Verify your model and the existing board's part number before installing.

Installation Guide

1. Safety First — Disconnect power at the furnace switch and breaker. Verify zero voltage with a multimeter before touching the board.
2. Access — Remove the control-compartment service panel.
3. Document — Photograph every wire and connector on the existing board before disconnecting anything.
4. Remove — Unplug the wiring harnesses, remove the mounting screws, and lift out the old board.
5. Install — Mount the new board, then reconnect each harness exactly per your photo. Match every terminal.
6. Test — Restore power, run a full heat cycle, and confirm proper ignition, blower operation, and a steady diagnostic LED.

Signs You Need a Replacement

• Furnace is completely unresponsive with no power to controls
• No ignition despite a good igniter, gas, and thermostat call
• Blower runs constantly or fails to start
• Diagnostic LED flashes a control or hard-lockout fault code

Shipping & Returns

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