ICP Furnace Control Board Kit for RGS121HECB0AAA — Integrated Ignition Control | 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 RGS121HECB0AAA gas furnace. The board is the brain of the furnace — it sequences the inducer, hot surface igniter, gas valve, and blower; manages safety lockouts from the limit and pressure switches; and stores diagnostic flash codes on its onboard LED. A failed board typically presents as a completely dead furnace, an inducer that runs but never advances to ignition, a blower that won't energize, or an LED flashing a hard-lockout fault. Because intermittent board failures mimic igniter, pressure-switch, and gas-valve problems, replacing the IFC is a common final step after those components test good.
Specifications
| Spec | Value |
|---|---|
| Part Number | 1183618 |
| Type | Integrated Furnace Control Board Kit |
| Brand | ICP / Tempstar / Heil |
| Fits Model | RGS121HECB0AAA |
| Control Voltage | 24V |
| Diagnostics | Onboard LED flash codes |
Compatibility
Direct replacement for the ICP RGS121HECB0AAA gas furnace and shared Tempstar, Heil, Comfortmaker, and Day & Night models using the same control platform. Match the OEM number on your existing board before ordering.
Installation Guide
- Safety First — Disconnect power at the furnace switch and breaker. Verify zero voltage with a multimeter.
- Access — Remove the blower-compartment service panel.
- Document — Photograph every wire and connector position before disconnecting — terminal layout is critical.
- Remove — Unplug all harnesses, remove the mounting screws, and lift out the old board.
- Install — Mount the new board, transfer the wiring exactly per your photo, and set any jumper/dip configuration to match.
- Test — Restore power and run a full heat cycle; confirm normal sequencing and a steady status LED.
Signs You Need a Replacement
- Furnace completely unresponsive with 24V and line power present
- Inducer runs but igniter and gas valve never energize
- Blower fails to start or runs continuously
- Status LED dark or flashing a hard-lockout/internal fault code
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