ICP Control Board Kit for RGS303SEAA0AAAA — OEM 1183618 Furnace Board | Ships Today
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Overview
This is a genuine OEM control board kit (Part No. 1183618) for the ICP / Tempstar / Heil RGS303SEAA0AAAA gas furnace. The integrated furnace control board is the brain of the system — it manages the entire heating sequence, including the inducer motor, hot surface igniter, gas valve timing, flame sensing, blower on/off delays, and the safety lockout logic that monitors limit and pressure switches. The kit includes the board and the hardware/instructions needed for a complete replacement. When the board fails, the furnace may show no response, erratic operation, repeated lockouts, blower problems, or fault codes flashing on the diagnostic LED.
Specifications
| Spec | Value |
|---|---|
| OEM Part Number | 1183618 |
| Type | Integrated Furnace Control Board Kit |
| Brand | ICP / Tempstar / Heil |
| Function | Ignition, blower, gas valve & safety sequencing |
| Includes | Control board and replacement hardware/instructions |
| Fitment | OEM replacement |
Compatibility
Engineered for the ICP family gas furnace model RGS303SEAA0AAAA (also branded Tempstar, Heil, and Comfortmaker). As a kit, 1183618 is the correct OEM service replacement — confirm the part number printed on your existing board before ordering, as control boards are model-specific.
Installation Guide
- Safety First — Disconnect power at the furnace switch and breaker, then verify zero voltage with a multimeter.
- Access — Remove the furnace service panel to expose the control board.
- Document — Photograph every connector and wire on the board before disconnecting; note plug locations carefully.
- Remove — Unplug each harness, release the board standoffs or screws, and lift the old board out.
- Install — Mount the new 1183618 board and reconnect every harness exactly per your photos.
- Test — Restore power and run a full heat cycle, watching the diagnostic LED for normal operation and no fault codes.
Signs You Need a Replacement
- Furnace is completely unresponsive to a heat call
- Repeated lockouts or fault codes on the diagnostic LED
- Blower or inducer runs erratically or at the wrong times
- Visible burnt traces, scorching, or damaged relays 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