ICP Furnace Control Board Kit for RGS121LFCB0AAA — OEM Integrated Control | Ships Today
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Overview
This OEM control board kit (part 1183618) is the integrated furnace control (IFC) for the ICP / Heil / Tempstar RGS121LFCB0AAA gas furnace. The board is the brain of the furnace: it manages the entire heating sequence — powering the inducer, proving pressure switches, energizing the hot surface igniter, opening the gas valve, monitoring flame via the sensor, and timing the blower on and off. It also runs continuous safety logic and stores diagnostic fault codes on its LED. When the board fails, symptoms range from a completely dead furnace to erratic blower behavior, ignition lockouts, or repeated trips with no apparent component fault. Because it ships as a kit, it includes the hardware needed for a clean OEM replacement.
Specifications
| Spec | Value |
|---|---|
| Part Number | 1183618 |
| Type | Integrated Furnace Control Board Kit |
| Brand | ICP (Heil / Tempstar / Comfortmaker) |
| Fits Model | RGS121LFCB0AAA |
| Function | Ignition, blower, and safety sequencing with diagnostics |
| Fitment | OEM exact-fit replacement kit |
Compatibility
Designed for the ICP-built RGS121LFCB0AAA furnace and related Heil, Tempstar, and Comfortmaker models using this integrated control. Match the board part number and connector layout to your existing control before installing.
Installation Guide
- Safety First — Disconnect power at the furnace switch and breaker; verify zero voltage with a multimeter.
- Access — Remove the blower compartment service panel where the control board is mounted.
- Document — Photograph every wire harness and connector on the board before unplugging — this is the most important step.
- Remove — Unplug each connector, remove the mounting screws, and lift out the old board.
- Install — Mount the new board, transfer connectors one at a time to the matching terminals per your photo, and set any jumpers or DIP switches to match the original.
- Test — Restore power, run a full heat cycle, and confirm proper ignition, blower timing, and no fault codes on the LED.
Signs You Need a Replacement
- Furnace completely dead with power confirmed at the board
- Repeated ignition lockouts with healthy igniter, flame sensor, and gas valve
- Blower runs continuously or fails to start
- Diagnostic LED shows a control fault or no light at all
Shipping & Returns
Ships same day before 3 PM CST. 30-day returns. 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