ICP Furnace Control Board Kit for RGS300LRAA0AAAA — OEM 1183618 | Ships Today
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Overview
This OEM control board kit (part number 1183618) is the integrated furnace control (IFC) brain of the ICP Tempstar/Heil RGS300LRAA0AAAA gas furnace. It sequences the entire heating cycle — energizing the inducer, proving pressure switches, firing the hot surface igniter, opening the gas valve, monitoring flame, and timing the blower on and off delays. It also reads thermostat calls and provides diagnostic fault codes via an onboard LED. A failed board causes intermittent or total no-heat, blower running constantly, no response to the thermostat, or repeated lockouts that no other component can explain.
Specifications
| Spec | Value |
|---|---|
| Part Number | 1183618 |
| Description | Kit, Control Board |
| Type | Integrated Furnace Control (IFC) |
| Brand | ICP (Tempstar / Heil) |
| Fitment | OEM |
| Application | Gas Furnace Sequencing & Diagnostics |
Compatibility
Supplied as the factory replacement control board kit for the ICP Tempstar/Heil RGS300LRAA0AAAA gas furnace, and fits matching RGS300 series furnaces using the same board. Verify the part number printed on your existing board and your unit's model/serial tag before ordering.
Installation Guide
- Safety First — Disconnect power at the furnace switch and breaker. Verify zero voltage with a multimeter before touching wiring.
- Access — Remove the furnace control/blower compartment access panel.
- Document — Photograph every wire and connector on the existing board before disconnecting; the harness positions are critical.
- Remove — Label and unplug each connector, remove the board mounting screws, and lift out the old control board.
- Install — Mount the new 1183618 board, transfer connections one at a time per your photos, and confirm the ground is secure.
- Test — Restore power, run a full heat cycle, and watch the diagnostic LED to confirm normal operation with no fault codes.
Signs You Need a Replacement
- Furnace does not respond to thermostat calls for heat
- Blower runs continuously or fails to start on schedule
- Intermittent ignition lockouts with no fault in igniter, valve, or switches
- Diagnostic LED is dark, scrambled, or flashing a hard board fault
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