ICP Furnace Control Board Kit for RGS121SFCA0AAA — OEM 1183618 | Ships Today
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Overview
This genuine OEM control board kit (part number 1183618) is the integrated furnace control (IFC) for the ICP / Tempstar / Heil RGS121SFCA0AAA gas furnace. The board is the brain of the furnace: it manages the ignition sequence, sequences the inducer and blower motors, monitors safety inputs (limit switches, pressure switch, flame sense), and flashes diagnostic fault codes through its onboard LED. The kit format includes the board plus the necessary mounting/connector hardware for a clean swap. A failed board causes erratic no-heat behavior, blower or inducer motors that won't run, or a furnace that lockouts with no clear cause. Replacing the IFC restores correct timing and safety sequencing.
Specifications
| Spec | Value |
|---|---|
| Part Number | 1183618 |
| Type | Integrated Furnace Control Board Kit |
| Brand | ICP / Tempstar / Heil |
| Function | Ignition, blower/inducer sequencing, safety monitoring, diagnostics |
| Includes | Control board + mounting/connector hardware |
| Fitment | OEM direct replacement |
Compatibility
Designed for the ICP/Tempstar/Heil RGS121SFCA0AAA furnace and shared platforms using this control. Confirm board layout, connector positions, and part number against your existing control before installing.
Installation Guide
- Safety First — Disconnect electrical power and shut off gas; verify zero voltage with a multimeter.
- Access — Remove the furnace control/blower-compartment service panel.
- Document — Photograph every plug and wire on the old board before unplugging anything — connector placement is critical.
- Remove — Unplug all harness connectors, remove the mounting screws/standoffs, and lift out the old board.
- Install — Mount the new board on the supplied hardware and reconnect each harness exactly per your photo.
- Test — Restore gas and power, call for heat, and verify the full ignition, inducer, and blower sequence with no fault codes.
Signs You Need a Replacement
- Furnace completely dead or intermittently no-heat
- Blower or inducer motor won't energize on a call
- Diagnostic LED flashing a board/control fault code
- Erratic short-cycling not traced to sensors or switches
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