ICP Furnace Control Board for RGS300LEFA0AAAA — OEM Kit 1183618 | Ships Today

Overview

The ICP control board kit (OEM part 1183618) is the integrated furnace control (IFC) that runs the entire heating sequence on your ICP / Tempstar / Heil RGS300LEFA0AAAA gas furnace. This circuit board manages the ignition sequence, monitors flame and safety limits, sequences the inducer and blower motors, and times the heat and cool cycles. When the board fails, the furnace may fail to ignite, lock out after several attempts, run the blower continuously, or stop responding to the thermostat entirely. Because the IFC is the brain of the appliance, replacing it with a genuine OEM kit restores reliable, code-correct operation.

Specifications

Compatibility

This OEM control board kit is engineered for the ICP Tempstar Heil RGS300LEFA0AAAA gas furnace and related RGS300-series equipment that calls for OEM 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, then verify zero voltage with a multimeter.
2. Access — Remove the furnace blower/control panel to expose the board.
3. Document — Photograph every wire and connector position before disconnecting.
4. Remove — Unplug the molex harnesses and spade terminals, then unscrew the failed board from its standoffs.
5. Install — Mount the new board, transfer any jumper/DIP settings, and reconnect each harness exactly per your photos.
6. Test — Restore power and run a full heat cycle, confirming ignition, flame proving, and blower operation.

Signs You Need a Replacement

• Furnace will not ignite or locks out after repeated trial-for-ignition attempts
• Blower runs constantly or fails to start during a heat call
• No response to thermostat or erratic short-cycling
• Visible burnt traces, scorch marks, or a blown onboard fuse

Shipping & Returns

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