ICP Integrated Furnace Control Board for RGS121LECB0AAA — OEM Kit 1183618 | Ships Today
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Overview
This is the genuine OEM integrated furnace control board kit (part number 1183618) for the ICP / Tempstar / Heil RGS121LECB0AAA gas furnace. The control board is the brain of the furnace — it manages the ignition sequence, monitors safety limits and flame sensing, sequences the inducer and blower motors, and controls the gas valve and hot surface igniter timing. When this board fails, the furnace may fail to ignite, short-cycle, lock out, throw error codes on its diagnostic LED, or stop responding to the thermostat entirely. Replacing it with the correct OEM kit restores proper ignition logic and safety operation. Each board ships pre-configured for this furnace family so you avoid field-programming guesswork.
Specifications
| Spec | Value |
|---|---|
| Part Number | 1183618 (KIT CONTROL BOARD) |
| Type | Integrated Furnace Control Board |
| Brand | ICP / Tempstar / Heil |
| Fits Model | RGS121LECB0AAA |
| Control Voltage | 24V / 120V |
| Application | Gas Furnace |
| Fitment | OEM Replacement |
Compatibility
Designed as a direct OEM replacement for the ICP / Tempstar / Heil / Comfortmaker RGS121LECB0AAA gas furnace. Always confirm your existing board's part number and connector layout against PN 1183618 before installing.
Installation Guide
- Safety First — Disconnect power at the furnace switch and breaker; verify zero voltage with a multimeter and shut off the gas supply.
- Access — Remove the furnace service/blower compartment panel.
- Document — Photograph every wire and connector on the existing board before disconnecting anything.
- Remove — Unplug the wiring harnesses, release the board mounting tabs/screws, and lift out the old control board.
- Install — Mount the new board, then reconnect each harness exactly per your photos.
- Test — Restore gas and power, call for heat, and verify the full ignition sequence and blower operation; check the diagnostic LED for normal status.
Signs You Need a Replacement
- Furnace will not ignite or fails to respond to the thermostat
- Repeated lockouts or short-cycling on a call for heat
- Diagnostic LED flashing a hard-fault or board fault code
- Inducer or blower motor not sequencing correctly
Shipping & Returns
Ships same day on orders placed 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