What are the specs for this Control Board?

The correct replacement for ICP model RGS303LRFA0AAAA — OEM 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 RGS303LRFA0AAAA — OEM 1183618 | Ships Today.

ICP

ICP Furnace Control Board Kit for RGS303LRFA0AAAA — OEM 1183618 | Ships Today

Name: ICP Furnace Control Board Kit for RGS303LRFA0AAAA — OEM 1183618 | Ships Today
Brand: ICP
SKU: 1183618
Price: 219.64 USD
Availability: InStock

SKU: 1183618 Brand: ICP

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Overview

This genuine OEM control board kit (part number 1183618) is the integrated furnace control (IFC) for the ICP / Tempstar / Heil RGS303LRFA0AAAA gas furnace. The board is the brain of the furnace — it manages the ignition sequence, sequences the inducer and blower motors, monitors safety limits and flame sense, and runs the self-diagnostic LED fault codes. When the board fails you may see intermittent no-heat, blower or inducer that won't start or won't stop, scrambled fault codes, or a completely dead furnace. This OEM kit restores correct, safe sequencing and diagnostics.

Specifications

Spec	Value
Part Number	1183618
Description	Control Board Kit
Type	Integrated Furnace Control (IFC)
Brand	ICP (Tempstar / Heil)
Fitment	OEM Replacement Kit
Application	Gas Furnace Control

Compatibility

Direct-fit replacement kit for the ICP / Tempstar / Heil RGS303LRFA0AAAA gas furnace and related RGS303 series units using this integrated furnace control. Confirm the board part number and connector layout against your existing control before ordering.

Installation Guide

Safety First — Disconnect power at the furnace switch and breaker, then verify zero voltage with a multimeter.
Access — Remove the blower/control compartment service panel.
Document — Photograph every plug, harness, and terminal on the board before disconnecting — this is the most important step.
Remove — Unplug each connector, release the board standoffs or screws, and lift the old board out.
Install — Mount the new board on the same standoffs and reconnect every harness to the matching connector per your photo.
Test — Restore power, run a full heat cycle, and confirm the diagnostic LED shows a normal status with proper inducer, ignition, and blower sequencing.

Signs You Need a Replacement

Furnace is completely dead with no diagnostic LED
Inducer or blower won't start, or won't shut off
Erratic or scrambled fault codes
Intermittent no-heat that clears on a power reset

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 Furnace Control Board Kit fo...

$219.64

Frequently Asked Questions

Does this Control Board fit my ICP RGS303LRFA0AAAA — OEM 1183618 | Ships Today?

Yes. This is the factory-specified OEM control board for the ICP RGS303LRFA0AAAA — OEM 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 RGS303LRFA0AAAA — OEM 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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