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Replacing a Lennox AC Circuit Board: A Step-by-Step Guide

Replacing a Lennox AC Circuit Board: A Step-by-Step Guide

Replacing a Lennox AC Circuit Board: A Step-by-Step Guide

Replacing a Lennox AC circuit board can be a daunting and potentially dangerous task that is best left to a qualified and certified HVAC professional. That said, some homeowners may choose to replace the circuit board on their own if they are comfortable and confident in their ability to access and handle electric components. If you’re a do-it-yourself type, then you’ll need to know how to properly and safely replace the circuit board in a Lennox air conditioner. This article outlines the essential steps to take when replacing a Lennox AC circuit board.

Step 1: Diagnose the Problem

Before replacing a circuit board, it is important to conduct a thorough process of diagnosis to determine whether or not the circuit board is, in fact, the source of the problem. If there are any other underlying issues with the AC unit, then diagnosing those issues must take precedence over circuit board replacement.

Part of the diagnostic process involves testing the components of the air conditioning system. This can be done by testing the pressure of the refrigerant, measuring the air flow from the system, and checking the voltage and amperage of the unit.

In some cases, a homeowner may be able to diagnose the problem, but should know that this is not an area to skimp on when it comes to hiring a professional for help. Many AC companies will be able to diagnose the problem quickly and accurately, and help you decide whether or not a circuit board replacement is the best solution.

Step 2: Choose an Appropriate Replacement Circuit Board

Once it is determined that the circuit board is the main culprit of the problem, the next step is to select the right replacement circuit board for your particular system. This will require some research, as different models and types of air conditioners require different boards.

The most important thing to remember is to choose a circuit board that is compatible with the Lennox AC unit. This means that the new board must have the same wiring and connectors as the current board. It is also important to make sure that the new board is rated for the amperage and voltage your AC unit uses.

Step 3: Disconnect the Old Board

once an appropriate circuit board is selected and purchased, the next step is to remove the old circuit board from the unit. First, you’ll need to be sure to turn off any power to the unit, including both the AC unit and the circuit breaker.

Then, you’ll need to locate the circuit board, which is typically located near the indoor blower section of the air conditioner. Once found, the old board should be unscrewed from its mount.

Finally, you’ll need to disconnect the wiring from the board and make sure all of the connections are marked to ensure the new board is wired correctly.

Step 4: Install the New Board

Now it’s time to install the new board. Start by following the instructions provided with the product to ensure its proper installation. Be sure to mark and wire each connection according to the instructions.

Once all the connections are made and aligned, you can secure the board to the air conditioner with screws. You’ll then need to turn the power back on to the unit.

Finalizing the Installation

The last part of the circuit board replacement process will involve testing the new board to ensure it is working correctly. Start by setting the thermostat on the highest setting and restarting the AC unit. Keep an eye on it for about an hour to make sure it is cooling properly.

If the AC is running smoothly and efficiently, then congratulations! Your circuit board replacement was a success. However, if the unit is not cooling properly, then you may have to check the connections or rewire the circuit board.

No matter what, it’s better to call a qualified and certified HVAC professional if you experience any problems during or after the installation process of the new circuit board. It helps to make sure that your AC unit is in top condition for the hottest days of summer.

Replacing a circuit board in a Lennox AC unit is a complex process that should only be handled by a trained and certified HVAC professional. If you choose to attempt the replacement yourself, be sure to take the proper safety precautions and make sure the new board is compatible with the unit. While it may be possible to make the repairs yourself, it’s best to save the hassle and leave it to the professionals. For reliable appliance repair you can trust, contact Local Reliable Appliance Repair at (866) 311-8590.

Replacing a Lennox AC Circuit Board: A Step-by-Step Guide
Replacing a Lennox AC Circuit Board: A Step-by-Step Guide
Replacing a Lennox AC Circuit Board: A Step-by-Step Guide

Tips to Avoid Issues with Lennox AC Circuit Board Replacement

Replacing an air conditioning unit’s circuit board can be an expensive, time-consuming process. To help avoid issues, Lennox, a trusted HVAC manufacturer, provides a few preventive action recommendations. By following these guidelines, the likelihood of experiencing costly, frustrating issues can be dramatically reduced.

Manufacturer Recommendations

Lennox urges those performing the service to read all instructions completely to understand the process and to practice caution when working with electrical wiring. To ensure a successful installation, the manufacturer highly recommends replacing the circuit board using only Lennox Genuine Parts — failure to do only can result in failure of the system and possible harm. Additionally, the technicians handling the installation should always double-check their connection, ensuring that all components on the installation side are in working order before connecting the line-voltage side.

Local Appliance Company Recommendations

When searching for an appliance company to do the installation, it is important to choose a reliable, certified local contractor. Not only do they typically follow the local state requirements, they also come with experience and are knowledgeable about the current, correct installation procedures and protocols. A qualified technician will be better able to predict, diagnose, and prevent potential issues.

HVAC Technician Recommendations

For more experienced HVAC professionals, they should always use the appropriate tools and materials when handling the job. This means paying close attention to tools and following manufacturer specifications. The technicians should also be sure to wear the necessary protective equipment and proper eyewear.

Lennox AC circuit board installation should also not be attempted without first having the needed safety equipment, such as GFCI outlets, PPE, and circuit breakers. Taking the time to properly inspect the wiring before installation will also help prevent potential issues. Lastly, should the need arise, a technician should always call for additional help to ensure proper ventilation and for additional safety reasons.


Replacing an air conditioning unit’s circuit board can be a complicated process, so following Lennox’s preventive actions can be beneficial in avoiding costly, frustrating issues. Utilizing a reliable, certified local appliance company and qualified technicians can further reduce the likelihood of problems. Additionally, the technicians should always use the appropriate tools and materials with the proper safety equipment and inspection of the wiring before beginning the job. Taking the necessary steps to prepare for and prevent potential issues can save time and money in the long run.

Average Repair Cost of Lennox AC Circuit Board Replacement in California

Whether you’re a homeowner in California or a contractor in need of air conditioning repair, determining the average costs of Lennox AC circuit board replacement is essential. Without proper repair or installation, the cost of your unit can easily skyrocket. At Local Reliable Air Conditioning & Heating, 866-311-8590, we can help provide you with the best advice and service for your air conditioning unit.

Repairing a Lennox AC circuit board in your California home can cost anywhere from $200 to $600, with an average price of approximately $400. This price, however, is assuming that you’re able to successfully locate a suitable replacement part and that installation is straightforward. Factors such as the cost of labor and materials, as well as the complexity of installation, can significantly raise this price.

There are several necessary parts for a successful AC circuit board installation, including capacitors, resistors, integrated circuits, terminal blocks, and power switches. A full itemized list can be provided by Local Reliable Air Conditioning & Heating. In some cases, obtaining the necessary parts may require additional costs.

For acomplex repair or installation, the same parts mentioned above may still be needed, although a greater number may also be necessary, depending on the specific unit. Factors such as ventilation and access difficulties can lead to additional labor and materials costs.

It’s important to note that repair costs can be subject to market forces, with an estimated increase of up to 20%. Your best bet for reliable and fair price estimates is to speak with a certified and licensed contractor such as the experts at Local Reliable Air Conditioning & Heating. Our friendly and knowledgeable staff can provide you with the best advice available for your Lennox AC circuit board replacement needs in California. Call us today at 866-311-8590 to schedule a consultation – we’re ready to help!

Replacing a Lennox Air Conditioner Circuit Board

Replacing the circuit board on a Lennox air conditioner can be a daunting task. But with California Reliable Air Conditioning & Heating, it’s easy! We are a family-owned company with highly trained technicians who offer same-day service. Our technicians have a minimum of 5 years experience and specialize in Lennox AC circuit board replacement.

We offer our customers fair and affordable pricing with a 90-day warranty on all repairs. So when you need your circuit board replaced, you can trust California Reliable to do the job quickly and correctly. Our same-day service ensures that you won’t have to wait to get your air conditioner up and running again.

At California Reliable Air Conditioning & Heating, we stand behind our work 100%. Our team of experienced technicians is both licensed and insured, so you can trust that your Lennox AC circuit board replacement is in good hands. We are committed to making sure your air conditioner is running safely and efficiently.

For reliable Lennox AC circuit board replacement, California Reliable Air Conditioning & Heating is your best choice. With our commitment to same-day service, fair pricing, and a 90-day warranty, you can trust that your air conditioner will be back up and running quickly. And best of all, you can have peace of mind knowing it was done correctly. Contact us today for your Lennox AC circuit board replacement!

FAQ: Replacing a Lennox AC Circuit Board

Q. What is a Lennox AC Circuit Board?

A: The Lennox circuit board is an important component of the air conditioning (AC) system. It is responsible for controlling the flow of electricity to the AC unit and communicating with other system parts.

Q. Why do people need to replace the circuit board?

A: The circuit board can malfunction due to age and wear, leading to decreased efficiency and breakdowns. Replacing the board can restore optimal performance and extend the life of the AC unit.

Q. What types of Lennox boards are available?

A: Various models of Lennox boards are available, depending on the make and model of the AC unit. It is important to purchase the correct one for optimal performance.

Q. What types of tools will I need for a Lennox AC circuit board replacement?

A: Opening the cabinet and replacing the board requires tools such as a voltage tester, screwdrivers, wire cutters, and a soldering iron.

Q. What is the step-by-step process for replacing the circuit board?

A: First, turn off the power to the unit and open the cabinet. Then, disconnect the wires and circuit board, test the voltage, and cut the wires. Finally, solder the new circuit board in place, reconnect the old wires, and close the cabinet.

Q. Does a Lennox AC circuit board replacement require professional help?

A: If you are not experienced with installing complex electrical systems, it is best to contact an experienced professional.

Contact Local Reliable Appliance Repair at (866) 311-8590 for assistance with replacing your Lennox AC circuit board.

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