ICP Furnace Control Board Kit for RGS120LTCB0AAA — OEM 1183618 | Ships Today
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Overview
This OEM integrated furnace control board kit (part 1183618) is the electronic brain of your ICP, Tempstar, and Heil RGS120LTCB0AAA gas furnace. It manages the entire heating sequence: it reads the thermostat call, energizes the inducer motor, proves the pressure switch, fires the hot surface igniter, opens the gas valve, monitors the flame sensor, and stages the blower on and off. The board also runs continuous safety logic and flashes diagnostic fault codes via its onboard LED. Control boards fail from voltage surges, lightning, overheating, corroded relays, and burned-out traces. When the board goes, the furnace may be completely dead, stuck mid-sequence, short-cycling, or throwing erratic fault codes. This kit is the factory replacement and includes the mounting hardware and connectors needed for a clean swap.
Specifications
| Spec | Value |
|---|---|
| OEM Part Number | 1183618 |
| Type | Integrated Furnace Control Board Kit |
| Brand | ICP / Tempstar / Heil |
| Function | Ignition, blower & safety sequence control |
| Diagnostics | Onboard LED fault codes |
| Fitment | OEM Direct Replacement |
Compatibility
Direct OEM replacement for the ICP / Tempstar / Heil RGS120LTCB0AAA gas furnace. Part 1183618 is the specified control kit for this model and related ICP-family furnaces — confirm the part number and connector layout against your existing board before installing.
Installation Guide
- Safety First — Disconnect power at the breaker and verify zero voltage with a multimeter.
- Access — Remove the blower or control compartment panel to expose the board.
- Document — Photograph every plug, wire, and terminal on the old board before disconnecting — this is the most important step.
- Remove — Unplug the wiring harnesses, remove the mounting screws/standoffs, and lift out the failed board.
- Install — Mount the new board, then transfer each connector exactly as documented. Match the DIP-switch or jumper settings to the original.
- Test — Restore power and run a full heat cycle; watch the diagnostic LED to confirm a normal sequence with no fault codes.
Signs You Need a Replacement
- Furnace completely unresponsive to a heat call
- Short-cycling or stalling partway through the ignition sequence
- Erratic or persistent diagnostic fault codes
- Visible burned relays, scorched traces, or corrosion on the 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