ICP Furnace Control Board Kit for RGS300HDEA0AAAA – OEM 1183618 | Ships Today

Overview

This OEM control board kit (part number 1183618) is the integrated furnace control (IFC) for the ICP / Tempstar / Heil RGS300HDEA0AAAA gas furnace. The board manages the entire heating sequence — inducer start, pressure switch proving, hot surface igniter warm-up, gas valve timing, blower on/off delays, and safety lockouts. When this board fails, the furnace typically stops responding to thermostat calls, the blower runs continuously, or the unit locks out and flashes a diagnostic error code. Replacing the board with the correct OEM kit restores reliable, code-driven operation and preserves the manufacturer's flame-safety logic.

Specifications

Compatibility

Engineered as the direct OEM replacement for the ICP Tempstar Heil RGS300HDEA0AAAA gas furnace and other models in the RGS300 family that originally shipped with control board 1183618. Always confirm the part number printed on your existing board before ordering.

Installation Guide

1. Safety First – Disconnect power at the furnace switch and breaker; verify zero voltage with a multimeter.
2. Access – Remove the furnace blower-compartment service panel.
3. Document – Photograph every wire and connector on the existing board before disconnecting.
4. Remove – Unplug all harness connectors, remove the mounting screws, and lift out the old board.
5. Install – Mount the new board on the same standoffs and reconnect each harness exactly per your photo.
6. Test – Restore power, run a heat cycle, and confirm the diagnostic LED shows normal operation.

Signs You Need a Replacement

• Furnace does not respond to thermostat heat calls
• Blower motor runs constantly or won't start
• Diagnostic LED flashing a hard-lockout fault code
• Visible burn marks, swollen relays, or scorched traces on the board

Shipping & Returns

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