ICP Furnace Control Board Kit for RGS300LDAA0AAAA — OEM Part 1183618 | Ships Today
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Overview
This genuine OEM control board kit (part number 1183618) is the electronic brain of the ICP / Heil / Tempstar RGS300LDAA0AAAA gas furnace. It manages the entire heating sequence — reading the thermostat call, energizing the inducer, proving the pressure switch, firing the igniter, opening the gas valve, monitoring flame, and staging the blower on and off. It also runs the safety logic and reports fault codes via its diagnostic LED. When the board fails, the furnace may be completely dead, ignite erratically, blow cold air, or flash error codes that point nowhere. Replacing it with the correct OEM kit restores proper sequencing, safety supervision, and reliable heat.
Specifications
| Spec | Value |
|---|---|
| Part Number | 1183618 |
| Description | Control Board Kit |
| Type | Integrated Furnace Control (IFC) |
| Brand | ICP (Heil / Tempstar / Comfortmaker) |
| Fits Model | RGS300LDAA0AAAA |
| Fitment | Genuine OEM Replacement Kit |
Compatibility
Direct-fit replacement kit for the ICP/Heil/Tempstar RGS300LDAA0AAAA gas furnace and shared platform models specifying OEM part 1183618. Confirm the part number on your existing board before installing.
Installation Guide
- Safety First — Disconnect power at the furnace switch and breaker, then verify zero voltage with a multimeter before touching the board.
- Access — Remove the furnace control/blower panel to expose the existing control board.
- Document — Photograph every connector, harness, and terminal position before disconnecting.
- Remove — Unplug the harnesses one at a time, release the mounting standoffs/screws, and lift out the old board.
- Install — Mount the new board, transfer each connector to its matching terminal per your photo, and confirm dip-switch/jumper settings match the original.
- Test — Restore power, run a full heat cycle, and verify the diagnostic LED shows normal operation with no fault codes.
Signs You Need a Replacement
- Furnace is completely unresponsive to a thermostat call.
- Diagnostic LED flashing inconsistent or unresolvable fault codes.
- Blower or inducer runs continuously, or won't run at all.
- Visible burnt traces, scorched relays, or a melted connector 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