ICP Furnace Control Board Kit for RGS120LDCB0AAA — OEM | Ships Today
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Overview
This genuine OEM control board kit (part 1183618) is the integrated furnace control (IFC) for the ICP/Tempstar/Heil RGS120LDCB0AAA gas furnace. The control board is the brain of the furnace — it sequences the entire heating cycle, managing the inducer motor, hot surface igniter, gas valve, blower timing, and safety interlocks while monitoring the limit and flame-sensing circuits. It also typically carries diagnostic LED fault codes that simplify troubleshooting. Because it controls 120V and 24V circuits simultaneously and is exposed to heat and electrical surges, the control board is a common failure point. Symptoms of a failed board include a furnace that is completely dead, no response to a thermostat call, no inducer or igniter sequence, a blower that runs constantly or not at all, blank or flashing error LEDs, or repeated random lockouts. This kit includes the replacement board for a direct OEM repair.
Specifications
| Spec | Value |
|---|---|
| Part Number | 1183618 |
| Type | Integrated Furnace Control Board Kit |
| Brand | ICP / Tempstar / Heil |
| Line Voltage | 120 VAC |
| Control Voltage | 24 VAC |
| Fitment | RGS120LDCB0AAA |
Compatibility
Direct OEM replacement control board kit for the ICP/Tempstar/Heil RGS120LDCB0AAA gas furnace. Confirm the part number on your existing board matches 1183618 before ordering, as control boards are model-specific.
Installation Guide
- Safety First — Disconnect power at the furnace switch and breaker, and verify zero voltage with a multimeter.
- Access — Remove the furnace control access panel to expose the board.
- Document — Photograph every wire and connector position on the old board before disconnecting — this is critical for a control board.
- Remove — Unplug each harness and the line-voltage terminals, then unscrew the board from its standoffs.
- Install — Mount the new board and reconnect every connector exactly per your photos and the wiring diagram.
- Test — Restore power and run a full heat call, confirming inducer, igniter, gas valve, and blower sequence correctly with no fault codes.
Signs You Need a Replacement
- Furnace is completely dead and unresponsive to thermostat calls
- No inducer, igniter, or blower sequence on a call for heat
- Blank, missing, or continuously flashing diagnostic LED codes
- Repeated random lockouts that other component swaps don't cure
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