ICP Control Board Kit for RGS121STCB0AAA — OEM 1183618 | Ships Today
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Overview
This OEM control board kit (part #1183618) is the integrated furnace control (IFC) for the ICP/Tempstar/Heil RGS121STCB0AAA. The board is the brain of the furnace — it manages the ignition sequence, sequences the inducer and blower motors, monitors safety circuits (limits, pressure switch, flame sense), and communicates fault codes via its diagnostic LED. When the board fails, the furnace may fail to start, lock out intermittently, run the blower continuously, or show no response at all. This complete kit includes the board and the hardware needed for installation.
Specifications
| Spec | Value |
|---|---|
| Part Number | 1183618 |
| Type | Integrated Furnace Control Board Kit |
| Brand | ICP / Tempstar / Heil |
| Function | Ignition timing, motor sequencing, safety monitoring |
| Application | Gas furnace control |
Compatibility
Designed for the ICP/Tempstar/Heil RGS121STCB0AAA furnace and platforms specifying this control board kit. Match the board part number and connector layout to your existing board before ordering.
Installation Guide
- Safety First — Disconnect power and shut off gas. Verify zero voltage with a multimeter.
- Access — Remove the control/blower compartment panel.
- Document — Photograph every harness connector and wire position on the old board.
- Remove — Unplug all connectors, unscrew the board from its standoffs, and lift it out.
- Install — Mount the new board, transfer connectors one at a time exactly per your photos.
- Test — Restore gas and power, run a full heat cycle, and confirm proper sequencing and no fault codes.
Signs You Need a Replacement
- Furnace completely unresponsive on a heat call
- Intermittent lockouts or random shutdowns
- Blower or inducer runs continuously or won't start
- Visible burn marks, corrosion, or a no-light diagnostic LED
Shipping & Returns
Ships same day on orders placed 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