ICP Furnace Control Board for RGS121HFCB0AAA – OEM Kit 1183618 | Ships Today
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Overview
This is the genuine OEM furnace control board kit (part number 1183618) for the ICP Tempstar Heil RGS121HFCB0AAA gas furnace. The integrated furnace control board is the brain of your heating system — it manages the ignition sequence, monitors safety limits and flame sensing, controls the inducer and blower motors, and coordinates the gas valve timing. When this board fails, the furnace may fail to ignite, short-cycle, lock out, or stop responding to thermostat calls entirely. Common failure symptoms include a furnace that hums but won't start, an LED fault code on the board, blown low-voltage fuses, or intermittent no-heat conditions that come and go with temperature. This kit ships complete and ready to install as a direct replacement.
Specifications
| Spec | Value |
|---|---|
| Part Number | 1183618 |
| Type | Integrated Furnace Control Board Kit |
| Brand | ICP / Tempstar / Heil |
| Fits Model | RGS121HFCB0AAA |
| Fitment | OEM Direct Replacement |
| Application | Gas Furnace |
Compatibility
This control board kit is engineered specifically for the ICP Tempstar Heil RGS121HFCB0AAA furnace and related ICP-family equipment using OEM part 1183618. Always verify the part number printed on your existing board before ordering. ICP, Tempstar, Heil, and Comfortmaker share many components across these gas furnace platforms.
Installation Guide
- Safety First – Disconnect power at the furnace switch and breaker, then verify zero voltage with a multimeter before touching the board.
- Access – Remove the furnace blower/control compartment service panel.
- Document – Photograph every wire and connector position on the board before disconnecting anything.
- Remove – Unplug each harness, release the board mounting standoffs or screws, and lift the old board out.
- Install – Seat the new board on the standoffs and reconnect every harness exactly per your photo.
- Test – Restore power, call for heat, and verify the full ignition sequence and blower operation.
Signs You Need a Replacement
- Furnace will not respond to the thermostat or fails to ignite
- Visible burn marks, corrosion, or a blinking fault LED on the board
- Repeated blown 3-amp low-voltage fuses
- Intermittent no-heat or short-cycling that resists other fixes
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