ICP Furnace Control Board for RGS336LEFA0AAAA — OEM Kit 1183618 | Ships Today

Overview

This genuine OEM furnace control board kit (part number 1183618) is the brain of the ICP/Tempstar/Heil RGS336LEFA0AAAA gas furnace. The integrated furnace control (IFC) manages the ignition sequence, blower timing, inducer motor operation, gas valve activation, and built-in safety interlocks. When this board fails, the furnace may fail to ignite, short-cycle, run the blower continuously, or lock out entirely. A flashing diagnostic LED that no longer responds, no 24V output to the gas valve, or a furnace that is completely unresponsive are all classic signs of a failed control board. Installing the correct OEM kit restores reliable, code-compliant operation.

Specifications

Compatibility

Designed as the factory replacement for the ICP/Tempstar/Heil RGS336LEFA0AAAA gas furnace and shared family variants that originally used kit 1183618. Always confirm your existing board's part number 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-compartment service panel.
3. Document — Photograph every wire and connector position on the old board before disconnecting anything.
4. Remove — Unplug the low-voltage and line-voltage harnesses, release the mounting screws/standoffs, and lift out the old board.
5. Install — Mount the new 1183618 board, then reconnect each harness exactly per your photos.
6. Test — Restore power and confirm a full ignition cycle, blower operation, and a normal diagnostic LED.

Signs You Need a Replacement

• Furnace is completely unresponsive with no LED activity
• No 24V signal to the gas valve or inducer during a call for heat
• Repeated lockouts or erratic short-cycling
• Blower runs continuously or fails to start

Shipping & Returns

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