ICP Control Board for RGS243LTAA0AAAA — OEM Furnace Kit 1183618 | Ships Today
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Overview
The OEM 1183618 control board kit is the integrated furnace control (IFC) module for the ICP / Tempstar / Heil RGS243LTAA0AAAA gas furnace. This board is the brain of the furnace: it sequences the inducer motor, hot surface igniter, gas valve, and blower motor while monitoring the pressure switch, flame sensor, and limit switches. It also drives the 24V control circuit and provides the diagnostic LED fault codes used during troubleshooting. When this board fails, the furnace typically will not start, locks out after a few ignition attempts, runs the blower continuously, or shuts down on a false safety fault. A cracked relay, burned terminal, or failed microprocessor on the original board are the most common reasons for replacement.
Specifications
| Spec | Value |
|---|---|
| Part Number | 1183618 (KIT CONTROL BOARD) |
| Type | Integrated Furnace Control Board |
| Brand | ICP / Tempstar / Heil |
| Control Voltage | 24V |
| Application | Gas Furnace |
| Fitment | OEM Replacement |
Compatibility
Engineered as a direct OEM fit for the ICP RGS243LTAA0AAAA furnace and other ICP-family models that originally shipped with kit 1183618. Always verify your existing board's part number against the OEM number before ordering to confirm an exact match.
Installation Guide
- Safety First — Disconnect power at the furnace switch and breaker, then verify zero voltage with a multimeter.
- Access — Remove the furnace blower-compartment service panel.
- Document — Photograph every wire and connector on the existing board before disconnecting.
- Remove — Label and unplug each harness, remove the mounting screws/standoffs, and lift out the old board.
- Install — Mount the new 1183618 board, reconnect each harness exactly per your photos, and set any jumpers/DIP switches to match.
- Test — Restore power and run a full heat cycle; confirm proper ignition, blower timing, and no fault codes on the diagnostic LED.
Signs You Need a Replacement
- Furnace will not ignite or repeatedly locks out
- Blower runs continuously or fails to start
- Diagnostic LED is dark, frozen, or flashing a hard fault
- Visible burnt traces, melted relays, or scorched terminals on the old board
Shipping & Returns
Ships same day before 3 PM CST. 30-day returns. Backed by the National HVAC Parts fitment guarantee.
Shipping Information
- Orders placed before 3PM CST ship same business day
- Standard delivery: 2-5 business days
- Express shipping available at checkout
- Free shipping on orders over $75
- Tracking number emailed upon shipment
Return Policy
- 30-day returns on unused parts in original packaging
- Electrical parts (capacitors, contactors, control boards) are final sale once installed
- Email info@nationalhvacparts.com to initiate a return
- Refunds processed within 5-7 business days