What are the specs for this Control Board?

The correct replacement for ICP model RGS121SFCB0AAA — OEM | 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 RGS121SFCB0AAA — OEM | Ships Today.

ICP

ICP Furnace Control Board Kit for RGS121SFCB0AAA — OEM | Ships Today

Name: ICP Furnace Control Board Kit for RGS121SFCB0AAA — OEM | Ships Today
Brand: ICP
SKU: 1183618
Price: 246.94 USD
Availability: InStock

SKU: 1183618 Brand: ICP

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Overview

This genuine OEM control board kit (PN 1183618) is the integrated furnace control (IFC) for the ICP / Heil / Tempstar RGS121SFCB0AAA gas furnace. The board is the brain of the furnace — it manages the ignition sequence, sequences the inducer and blower motors, monitors the flame sensor and limit switches, controls the gas valve, and drives the diagnostic LED. When the board fails you may see no response on a heat call, a blower that never starts or never stops, a flashing fault code on the diagnostic LED, or intermittent operation. The kit ships with the mounting hardware and instructions needed for a complete OEM replacement.

Specifications

Spec	Value
Part Number	1183618
Type	Integrated Furnace Control Board Kit
Line Voltage	120V
Control Voltage	24V
Brand	ICP (Heil / Tempstar / Comfortmaker)
Fitment	OEM Direct Replacement Kit

Compatibility

Direct OEM replacement for the ICP/Heil/Tempstar RGS121SFCB0AAA and other ICP-family furnaces that use the 1183618 control board kit. Confirm the board part number printed on your existing control and the connector layout before installing.

Installation Guide

Safety First — Disconnect electrical power and shut off gas, then verify zero voltage with a multimeter.
Access — Remove the furnace control compartment service panel.
Document — Photograph every harness and terminal connection on the existing board.
Remove — Unplug each connector, release the board standoffs, and remove the old control.
Install — Mount the new board and reconnect each harness exactly per your photo and the kit instructions.
Test — Restore gas and power, run a full heat cycle, and confirm the diagnostic LED shows normal operation.

Signs You Need a Replacement

No response from the furnace on a call for heat
Blower runs constantly or never engages
Diagnostic LED flashes a hard fault or control fault code
Burned, corroded, or relay-clicking board with intermittent operation

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...

$246.94

Frequently Asked Questions

Does this Control Board fit my ICP RGS121SFCB0AAA — OEM | Ships Today?

Yes. This is the factory-specified OEM control board for the ICP RGS121SFCB0AAA — OEM | 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 RGS121SFCB0AAA — OEM | 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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