ICP Furnace Control Board for RGS300LSFA0AAAA — Kit 1183618 | Ships Today
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Overview
This OEM control board kit (part number 1183618) is the integrated furnace control (IFC) for the ICP/Heil/Tempstar RGS300LSFA0AAAA gas furnace. The board manages the entire heating sequence — inducer startup, igniter warm-up, gas-valve timing, flame sensing, blower on/off delays, and safety lockouts. It also reads pressure switches and limit switches to shut the system down on a fault. When a control board fails, the furnace may not respond to the thermostat, the blower may run continuously, the igniter may never energize, or the board may flash diagnostic fault codes. A failed or burned board is a common cause of intermittent no-heat conditions. Replacing it with a genuine OEM kit restores full sequencing, diagnostics, and safety operation.
Specifications
| Spec | Value |
|---|---|
| Part Number | 1183618 |
| Type | Integrated Furnace Control Board Kit |
| Brand | ICP (Heil / Tempstar / Comfortmaker) |
| Fits Model | RGS300LSFA0AAAA |
| Voltage | 120V primary / 24V control |
| Functions | Ignition sequencing, blower timing, flame sense, safety lockout, diagnostics |
| Fitment | OEM direct replacement |
Compatibility
Direct OEM replacement for the ICP/Heil/Tempstar/Comfortmaker RGS300LSFA0AAAA gas furnace and other RGS300-series units specifying control board kit 1183618. Verify your existing board part number and connector layout before ordering.
Installation Guide
- Safety First — Disconnect power at the furnace switch and breaker, and verify zero voltage with a multimeter.
- Access — Remove the blower-compartment service panel.
- Document — Photograph every connector and wire location on the board before disconnecting anything.
- Remove — Unplug all harness connectors, remove the mounting screws or standoffs, and lift out the old board.
- Install — Mount the new board, transfer any required jumpers/settings, and reconnect each harness exactly per your photos.
- Test — Restore power, run a full heat cycle, and confirm correct ignition, blower timing, and no fault codes.
Signs You Need a Replacement
- Furnace does not respond to thermostat heat calls.
- Blower runs continuously or fails to start.
- Repeated lockouts or flashing diagnostic fault codes.
- Visible burn marks, corrosion, or a cracked relay 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