ICP Furnace Control Board Kit for RGS300SDAA0AAAA — OEM 1183618 | Ships Today

Overview

This genuine OEM control board kit (part #1183618) is the integrated furnace control for the ICP / Tempstar / Heil RGS300SDAA0AAAA gas furnace. The board is the brain of the furnace: it sequences the entire heat cycle — inducer, ignition, gas valve, and blower timing — while monitoring safety inputs such as limits and flame sense. It also typically manages the thermostat call, blower-off delays, and onboard diagnostic LED fault codes. When the board fails, the furnace may be completely dead, fail to ignite, run the blower continuously, or flash error codes that don't clear. Supplied as a complete kit, this OEM control restores correct sequencing and protects the rest of the furnace by enforcing its built-in safety logic.

Specifications

Compatibility

Built for the ICP/Tempstar/Heil RGS300SDAA0AAAA furnace and shared-platform models that use this control kit. Confirm the board part number printed on your existing control against 1183618 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 control compartment panel.
3. Document — Photograph every wire and connector on the board, and note the dip-switch / jumper settings.
4. Remove — Unplug each harness, release the board standoffs, and lift out the old control.
5. Install — Mount the new board, transfer any settings, and reconnect every connector exactly per your photo.
6. Test — Restore power and run a full heat cycle, confirming proper inducer, ignition, and blower sequencing with no fault codes.

Signs You Need a Replacement

• Furnace is completely unresponsive with no diagnostic LED
• No ignition sequence despite a thermostat call
• Blower runs continuously or fails to start
• Persistent or non-clearing diagnostic fault codes

Shipping & Returns

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