ICP Furnace Control Board Kit for RGS300LDEA0AAAA — OEM 1183618 | Ships Today

Overview

This is the OEM control board kit (part number 1183618) for the ICP / Heil / Tempstar RGS300LDEA0AAAA gas furnace. The integrated furnace control board is the brain of the furnace — it manages the ignition sequence, blower and inducer timing, safety lockouts, and communication between the thermostat and furnace components. When the board fails, the furnace may not respond to the thermostat, may fail to ignite, may run the blower continuously, or may flash a diagnostic fault code. This kit includes the replacement board and the hardware needed for a clean swap.

Specifications

Compatibility

Directly fits the ICP RGS300LDEA0AAAA gas furnace and other RGS-series furnaces in the ICP family (Heil, Tempstar, Comfortmaker). Verify the OEM kit number 1183618 against your existing board before ordering, as control boards are model-specific.

Installation Guide

1. Safety First — Disconnect power at the furnace switch and breaker. Verify zero voltage with a multimeter.
2. Access — Remove the furnace control compartment service panel.
3. Document — Photograph every wire and connector on the existing board before disconnecting anything.
4. Remove — Label and unplug each connector, remove the mounting screws, and lift out the old board.
5. Install — Mount the new board from the kit and reconnect every wire exactly per your photo.
6. Test — Restore power and run a full heat cycle, confirming ignition, blower, and inducer operation with no fault codes.

Signs You Need a Replacement

• Furnace unresponsive to thermostat calls
• Blower or inducer runs continuously or not at all
• Diagnostic LED flashing a board/control fault code
• Intermittent operation or random lockouts

Shipping & Returns

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