What are the specs for this Control Board?

The correct replacement for ICP model RGS121LRCB0AAA — 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 RGS121LRCB0AAA — OEM 1183618 | Ships Today.

ICP

ICP Furnace Control Board Kit for RGS121LRCB0AAA — OEM 1183618 | Ships Today

Name: ICP Furnace Control Board Kit for RGS121LRCB0AAA — OEM 1183618 | Ships Today
Brand: ICP
SKU: 1183618
Price: 233.94 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 / Heil / Tempstar RGS121LRCB0AAA gas furnace. The board is the brain of the furnace: it sequences the inducer, igniter, gas valve, and blower, monitors safety switches (limit, pressure, flame sense), and runs the diagnostic LED. When the board fails, you may see no response to thermostat calls, blower or igniter that won't energize, erratic flashing fault codes, or a furnace stuck in lockout. This factory kit restores correct sequencing and safety control.

Specifications

Spec	Value
Part Number	1183618
Type	Integrated Furnace Control Board Kit
Brand	ICP / Heil / Tempstar
Function	Ignition, Blower & Safety Control
Fitment	OEM Replacement

Compatibility

Built for the ICP-family RGS121LRCB0AAA and related RGS-series furnaces using this integrated control. Match your existing board part number and connector layout before ordering.

Installation Guide

Safety First — Disconnect power at the furnace switch and breaker. Verify zero voltage with a multimeter.
Access — Remove the control compartment panel.
Document — Photograph every harness and terminal connection on the board before disconnecting.
Remove — Unplug each connector, remove the mounting screws, and lift out the old board.
Install — Mount the new board, transfer connectors to the matching terminals per your photo, and seat each plug fully.
Test — Restore power, run a full heat cycle, and confirm the diagnostic LED shows normal operation.

Signs You Need a Replacement

No response to thermostat heat calls
Blower or igniter that won't energize
Erratic or continuous fault-code flashing on the diagnostic LED
Furnace repeatedly enters hard lockout

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...

$233.94

Frequently Asked Questions

Does this Control Board fit my ICP RGS121LRCB0AAA — OEM 1183618 | Ships Today?

Yes. This is the factory-specified OEM control board for the ICP RGS121LRCB0AAA — 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 RGS121LRCB0AAA — 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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