ICP Furnace Control Board for RGS243LDAA0AAAA — OEM Kit 1183618 | Ships Today

Overview

This OEM integrated furnace control board (kit 1183618) is the brain of the ICP/Tempstar/Heil RGS243LDAA0AAAA gas furnace. It manages the ignition sequence, blower timing, flame-sensing safety lockout, and limit-switch monitoring. When this board fails you'll see the furnace fail to ignite, short-cycle, lock out after a few seconds of flame, or display blinking fault codes on the diagnostic LED. A scorched relay, corroded connector, or cracked solder joint on the original board are common reasons for replacement. This is a genuine OEM kit — not a generic substitute — so connector pinouts, relay ratings, and firmware timing match the furnace exactly.

Specifications

Compatibility

Engineered for the ICP/Tempstar/Heil RGS243LDAA0AAAA gas furnace. The same control board kit is shared across several RGS-series furnaces in this generation — confirm the printed part number 1183618 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 blower compartment service panel.
3. Document — Photograph every wire and connector position before disconnecting anything.
4. Remove — Unplug the molex harnesses, release the board standoffs/screws, and lift the old control board out.
5. Install — Mount the new board on the standoffs and reconnect each harness exactly per your photo.
6. Test — Restore power, call for heat, and confirm a full ignition cycle with no fault codes.

Signs You Need a Replacement

• Furnace will not ignite or blower never starts
• Repeated safety lockouts or blinking diagnostic fault codes
• Visible burn marks, melted relays, or corrosion on the board
• Intermittent operation that worsens with vibration or heat

Shipping & Returns

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