ICP Control Board for RGS303HDAA0AAAA — OEM Kit 1183618 | Ships Today
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Overview
This OEM control board kit (part 1183618) is the original-equipment furnace control for the ICP/Tempstar/Heil RGS303HDAA0AAAA. The integrated furnace control board is the brain of the system: it sequences the entire heat cycle — energizing the inducer, proving the pressure switch, firing ignition, opening the gas valve, monitoring flame, and timing the blower on and off. It also runs continuous safety and diagnostic checks and reports faults through its LED flash codes. When the board fails, the furnace can lose ignition entirely, behave erratically, short-cycle, or refuse to run the blower. Symptoms include no response to a thermostat call, blower or inducer that won't start, repeated lockouts with diagnostic flash codes, or visible scorching and burned relays on the board. This kit ships with the OEM board and the hardware needed for a clean replacement.
Specifications
| Spec | Value |
|---|---|
| Part Number | 1183618 |
| Type | Integrated Furnace Control Board Kit |
| Brand | ICP / Tempstar / Heil |
| Control Voltage | 24 VAC |
| Function | Ignition Sequencing, Flame Sense, Blower & Safety Timing |
| Fitment | OEM Replacement Kit |
Compatibility
Direct OEM replacement kit for the ICP/Tempstar/Heil RGS303HDAA0AAAA furnace and related models in the same family that use control board 1183618. Verify the part number printed on the original board before installing.
Installation Guide
- Safety First — Disconnect power at the furnace switch and breaker, then verify zero voltage with a multimeter.
- Access — Remove the furnace control compartment service panel.
- Document — Photograph every wire, plug, and terminal on the board before disconnecting anything.
- Remove — Unplug the harnesses and spade terminals, unfasten the board standoffs, and lift out the old board.
- Install — Mount the new OEM board on its standoffs and reconnect each connector exactly per your photo.
- Test — Restore power, run a full heat cycle, and confirm correct sequencing with no fault flash codes.
Signs You Need a Replacement
- No response from the furnace when the thermostat calls for heat
- Repeated lockouts or erratic operation with diagnostic flash codes
- Inducer or blower fails to energize at the right point in the cycle
- Visible burn marks, scorching, or failed 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