ARMSTRONG 20556101 Lennox Furnace Control Board Checked 1170-21-1 1170-83-23A

( Brand: Armstrong ), ( Manufacturer Part Number: 20556101 ), ( Model: 1170-21-1 ), ( Compatible Brand: Lennox, Armstrong ), ( Type: Furnace Control Board ), ( Compatible Product: Central Furnace )

Review ARMSTRONG Lennox Furnace Control Board Checked

Armstrong 20556101 Lennox 1170-21 Furnace Control Board (1170-83-23A)

The Armstrong 20556101 Lennox 1170-21 Furnace Control Board, model number 1170-83-23A, is a crucial component for ensuring the optimal performance of your Lennox furnace. This replacement control board is specifically designed to fit the Lennox 1170-21 series of furnaces, offering a seamless integration with minimal installation hassle.

This high-quality control board is equipped with advanced technology that allows it to effectively manage the various functions of your furnace, such as ignition, fan control, and safety monitoring. It is built to last with durable components that can withstand the rigors of regular use in a heating system.

The Armstrong 20556101 Lennox 1170-21 Furnace Control Board (1170-83-23A) is a reliable solution for those experiencing issues with their furnace's control system. By replacing this part, you can restore your furnace's performance and ensure a comfortable and efficient heating environment in your home.

Whether you're a homeowner looking to maintain your furnace or a HVAC professional servicing a client's system, this control board is an essential tool for keeping the heat flowing. With its precision engineering, easy installation, and compatibility with Lennox 1170-21 series furnaces, the Armstrong 20556101 Lennox 1170-21 Furnace Control Board (1170-83-23A) is a smart investment for maintaining the functionality and efficiency of your heating system.

Analysis of Armstrong 20556101 Lennox 1170-21 Furnace Control Board (1170-83-23A)

1. Compatibility: This control board is designed to fit specifically with Armstrong and Lennox models 20556101 and 1170-21, ensuring a seamless integration with your existing furnace.

2. Quality: Lennox is a well-established brand known for producing high-quality HVAC components, including control boards. This part may provide reliable performance and longevity.

3. Availability: Since it is a common part across multiple models, it is likely easy to find and purchase, either online or at a local HVAC supplier.

4. Warranty: Lennox typically offers a warranty on their parts, providing peace of mind with your purchase.

1. Cost: The price of this control board may be on the higher end compared to some aftermarket alternatives.

2. Limited Functionality: While suitable for the specific models it is designed for, it may not have the same level of versatility as more universal control boards.

3. Potential Compatibility Issues: Although it is designed for Armstrong and Lennox models 20556101 and 1170-21, there is always a risk of minor differences between units that could cause issues during installation.

Conclusion: The Armstrong 20556101 Lennox 1170-21 Furnace Control Board (1170-83-23A) offers excellent compatibility and quality, but it may come at a higher cost compared to some alternatives. If you own a compatible Armstrong or Lennox model and are willing to invest in a high-quality part, this control board could be a good choice. However, if you are looking for a more budget-friendly option or have a different HVAC system, you may want to consider other control boards.

Details:

Furnace Control Circuit Board. Clear photos of the part from multiple angles are included. OEM Lennox 1170-21. The number one reason people trying to fix their own equipment are unsuccessful is they purchase the wrong part.

Part numbers are important. Armstrong 20556101. If you select USPS priority mail, I pay approximately half the postage cost. Part, model, Version Numbers: 20556101.

USPS Ground Advantage and Priority Mail is the only shipping options I offer within United States. Many if not most suppliers of HVAC equipment and parts will only sell to licensed contractors. Please see photos. You can see close-ups and detail of the circuit board top bottom.

Packages are addressed clearly, and shipped promptly after purchase. GUARANTEE TO ALL OTHERS: To all others, please understand you are purchasing this at your risk and not mine. All parts are packed securely. If you take the time to write, can count on me respond and do my best help.

I do my best to ensure this. After checking, parts are secure until shipping no one else has access to them. After checking, they are secure until sold. After checking, photos were taken and the circuit board was wrapped in static card secure sold.

This confirms the control board is working properly. This makes a difference in the condition of parts like this control board. I still do care that you are pleased and will my best to help. This is not a business or parts dealer.

As many detailed photos .or as much information I do. Observed furnace starting, running and shutting down properly two times. Control boards are wrapped in static guard. I work for an HVAC company and the majority of parts sell here are used, from equipment i've removed.

This furnace was removed from a smoke free home. Important part numbers and model are included in the listing title, item, specifics. The best time to do this is before purchase. Unfortunately people trying to fix their own equipment often purchase the wrong part, or they misdiagnose issue and buy a part that was not what needed equipment, install it incorrectly.

part #: 20556101 prices

• $50.00-$70.00

specifications hvaapa:

• brand: Armstrong
• mpn: 20556101
• model: 1170-21-1
• compatible brand: Lennox, Armstrong
• type: Furnace Control Board
• compatible product: Central Furnace

returns hvaapa:

• policy: No Returns

general hvaapa:

• HVAC Refrigeration > HVAC Refrigeration: Parts Accessories > HVAC Refrigeration: Controls Circuit Boards
• condition: Used

seller hvaapa:

• # reviews: 6367
• rating: 100.0%
• city: North Canton, Ohio

offer hvaapa:

• quantity: 1
• sold: 0
• options: Ship-to-home
• availability: In Stock
• started: November 12, 2025

payments hvaapa:

• wallet: Google-pay
• credit card: Visa
• other

shipping hvaapa:

• class: Standard, Expedited
• type: Fixed
• transit: 3-7 Days
• cost: $0.00
• service: USPS Ground Advantage, USPS Priority Mail
• carrier: USPS

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