What are the specs for this Control Board?

The correct replacement for ICP model RGS121LSCA0AAA | 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 RGS121LSCA0AAA | Ships Today.

ICP

ICP Furnace Control Board Kit for RGS121LSCA0AAA | Ships Today

Name: ICP Furnace Control Board Kit for RGS121LSCA0AAA | Ships Today
Brand: ICP
SKU: 1183618
Price: 214.50 USD
Availability: InStock

SKU: 1183618 Brand: ICP

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Overview

This OEM control board kit (part 1183618) is the brain of the ICP / Tempstar / Heil RGS121LSCA0AAA gas furnace. The integrated furnace control board manages the entire ignition and operating sequence: it powers the inducer motor, runs the pressure switch and safety checks, energizes the hot surface igniter, opens the gas valve, and times the blower on and off. It also monitors flame sensing and provides diagnostic fault codes via an LED. When a control board fails, the symptoms range from intermittent no-heat and short cycling to a completely dead furnace. This kit includes the OEM board and required mounting hardware for a direct replacement.

Specifications

Spec	Value
Part Number	1183618
Type	Integrated Furnace Control Board Kit
Brand	ICP / Tempstar / Heil
Function	Ignition Sequencing, Blower & Safety Control
Diagnostics	LED Fault Code Output

Compatibility

Built for the ICP/Tempstar/Heil RGS121LSCA0AAA furnace and matching RGS121-series units that use this control board. Match the OEM part number and connector layout to your existing board before installing.

Installation Guide

Safety First — Disconnect power and shut off gas to the furnace; verify zero voltage with a multimeter.
Access — Remove the furnace blower/control compartment panel.
Document — Photograph every connector and wire on the existing board before unplugging.
Remove — Disconnect all harnesses, remove the mounting screws, and take out the old board.
Install — Mount the new board with the included hardware and reconnect each plug per your photo.
Test — Restore gas and power, run a full heat cycle, and confirm proper sequencing with no fault codes.

Signs You Need a Replacement

Furnace is completely unresponsive or won't power up
Short cycling or random shutdowns during heating
Blower or inducer won't start despite a call for heat
Diagnostic LED shows a control board fault code

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...

$214.50

Frequently Asked Questions

Does this Control Board fit my ICP RGS121LSCA0AAA | Ships Today?

Yes. This is the factory-specified OEM control board for the ICP RGS121LSCA0AAA | 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 RGS121LSCA0AAA | 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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