ICP Integrated Furnace Control Board Kit for RGS121HSCB0AAA — OEM | Ships Today
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Overview
This genuine OEM control board kit (part #1183618) is the integrated furnace control (IFC) brain of the ICP/Tempstar/Heil RGS121HSCB0AAA furnace. It sequences the entire heating cycle — energizing the inducer, proving the pressure switch, firing the hot surface igniter, opening the gas valve, monitoring flame, and timing the blower on and off. It also runs continuous safety logic and flashes diagnostic fault codes. When the board fails, symptoms range from no response at all to intermittent lockouts, blower that won't shut off, or erratic ignition. This kit includes the board and mounting hardware needed for a direct OEM replacement.
Specifications
| Spec | Value |
|---|---|
| Part Number | 1183618 |
| Type | Integrated Furnace Control Board Kit |
| Brand | ICP / Tempstar / Heil |
| Fits Model | RGS121HSCB0AAA |
| Function | Ignition, blower, inducer & safety timing control |
| Diagnostics | LED fault-code indication |
Compatibility
Built for the ICP-family RGS121HSCB0AAA and related Tempstar, Heil, and Comfortmaker furnaces using this integrated control. Because boards are revision-specific, verify part #1183618 against your existing board and unit parts list before ordering.
Installation Guide
- Safety First — Disconnect power to the furnace. Verify zero voltage with a multimeter.
- Access — Remove the furnace control/blower compartment panel.
- Document — Photograph every wire and connector on the old board; note plug locations carefully.
- Remove — Unplug all harnesses, remove the mounting screws, and lift out the old board.
- Install — Mount the new board and transfer each connector to the identical terminal per your photo.
- Test — Restore power, run a full heat cycle, and confirm proper ignition, blower timing, and no fault codes.
Signs You Need a Replacement
- Furnace completely unresponsive on a heat call
- Repeated lockouts or erratic ignition sequencing
- Blower runs constantly or fails to start
- Visible burnt traces, scorched relays, or no LED activity
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