What are the specs for this Control Board?

The correct replacement for ICP model RGS303LFFA0AAAA — OEM Furnace Control 1183618 | Ships Today is this exact part. It is the factory-specified replacement with exact OEM specifications. Using a part with different specifications can cause equipment damage or void your warranty. You can verify this by checking the data plate on your ICP equipment which lists the model number RGS303LFFA0AAAA — OEM Furnace Control 1183618 | Ships Today.

ICP

ICP Control Board Kit for RGS303LFFA0AAAA — OEM Furnace Control 1183618 | Ships Today

Name: ICP Control Board Kit for RGS303LFFA0AAAA — OEM Furnace Control 1183618 | Ships Today
Brand: ICP
SKU: 1183618
Price: 245.70 USD
Availability: InStock

SKU: 1183618 Brand: ICP

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Overview

This is a genuine OEM control board kit (part number 1183618) for the ICP/Tempstar/Heil RGS303LFFA0AAAA gas furnace. The integrated furnace control board is the brain of the heating system — it manages the ignition sequence, blower and inducer timing, safety interlocks, and diagnostic fault codes. When this board fails, the furnace may not start at all, may lock out after a few ignition attempts, may run the blower continuously, or may flash an error code on the diagnostic LED. Because it is the central controller, a failed board is one of the most common reasons a furnace stops producing heat. This kit ships complete and ready to install.

Specifications

Spec	Value
Part Number	1183618
Type	Integrated Furnace Control Board Kit
Brand	ICP (Tempstar / Heil / Comfortmaker)
Fits Model	RGS303LFFA0AAAA
Fit	OEM Replacement
Application	Gas Furnace

Compatibility

Designed as a direct OEM fit for the ICP/Tempstar/Heil RGS303LFFA0AAAA gas furnace. ICP-family brands (Heil, Tempstar, Comfortmaker, Arcoaire, KeepRite) share many components, so this board may also service related RGS-series models — always verify your existing board part number (1183618) before ordering.

Installation Guide

Safety First — Disconnect power at the furnace switch and breaker, then verify zero voltage with a multimeter at the board terminals.
Access — Remove the furnace front service panel to expose the control board.
Document — Photograph every wire and connector position before disconnecting anything.
Remove — Unplug the molex harnesses and low-voltage leads, release the board mounting standoffs/screws, and lift the old board out.
Install — Mount the new 1183618 board on the standoffs and reconnect every harness exactly per your photos.
Test — Restore power, initiate a heat call, and confirm proper ignition, blower, and inducer operation with no fault codes.

Signs You Need a Replacement

Furnace will not ignite or has no response to a thermostat call for heat.
Blower or inducer motor runs continuously or fails to start.
Repeated ignition lockouts or a flashing diagnostic fault code on the board LED.
Visible burn marks, corrosion, or cracked solder/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

ICP Control Board Kit for RGS303...

$245.70

Frequently Asked Questions

Does this Control Board fit my ICP RGS303LFFA0AAAA — OEM Furnace Control 1183618 | Ships Today?

Yes. This is the factory-specified OEM control board for the ICP RGS303LFFA0AAAA — OEM Furnace Control 1183618 | Ships Today. It is a direct drop-in replacement that fits without modification. Always verify the model number on your equipment nameplate before ordering.

How do I replace the control board on my ICP RGS303LFFA0AAAA — OEM Furnace Control 1183618 | Ships Today?

Difficulty: Advanced (1–2 hrs)
Step 1: Turn off breaker. Step 2: PHOTOGRAPH all wire connections before touching anything. Step 3: Label each wire with tape. Step 4: Disconnect all wires, remove old board. Step 5: Mount new board, reconnect all wires matching your photo exactly. Step 6: Restore power and test all modes. Exact part number match is critical.

My HVAC system is completely dead. What could be wrong?

Completely dead HVAC (no LED on board) = failed control board or blown fuse. Check board fuse first (3A or 5A, costs $1–$5). If fuse is good and board has power but no LED, board is dead. Always photograph wiring before replacing.

Is this control board compatible with Bryant or Payne too?

Many ICP parts are cross-compatible with Bryant and Payne since all three brands are manufactured by Carrier Global Corporation. The same physical part is often used across brand labels with different model numbers. To verify: check your Bryant or Payne equipment service manual for cross-compatible part numbers, or email info@nationalhvacparts.com with your model number.

Should I use OEM or aftermarket for my ICP control board?

OEM essential. Control boards are model-specific with precise firmware and connector layouts. Aftermarket boards rarely match all functions and can cause intermittent failures or safety issues. Always match the exact OEM part number.

How fast does National HVAC Parts ship?

Orders placed before 3:00 PM CST ship the same business day. Standard delivery is 2–5 business days anywhere in the continental United States. Express shipping available at checkout. We ship from Houston, TX to all 50 states. 30-day return policy on all parts.

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