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The Generac Control Board Problems: (Solution Tips) In 2023

Generac generators are a popular choice for providing backup power in residential and commercial settings. However, like any complex machine, they can experience issues over time. One potential source of trouble is the control board, which is responsible for regulating and monitoring the generator’s functions.

In this article, we’ll explore some common Generac control board problems, how to diagnose them, and potential solutions. Whether you’re a generator owner or a technician, understanding these issues can help keep your generator running smoothly.

Generac control board problems

What is a Generac Control Board?

Generac’s control board problems Before we dive into the common problems associated with Generac control boards, let’s first understand what a control board is. A control board, also known as a circuit board, is a vital component of your generator that manages and regulates its functions. It receives information from sensors throughout the generator and uses that information to control the engine, monitor electrical output, and more.

Generac Controller Assembly AC HSB

Generac Controller Assembly AC HSB

The Generac Controller Assembly AC HSB refers to a component used in Generac Home Standby (HSB) generators. It is an essential part of the generator’s control system. The controller assembly manages and monitors the generator’s operation, including starting, stopping, and ensuring proper functioning.

It provides real-time information about the generator’s status, such as voltage output, frequency, and diagnostic codes, allowing users to monitor and troubleshoot any issues that may arise.

The Generac Controller Assembly AC HSB plays a crucial role in the overall performance and reliability of Generac Home Standby generators.


  • Automated Operation: The controller assembly facilitates the automatic operation of the generator during power outages, providing convenience and peace of mind.
  • Self-Diagnostics: Many Generac controllers include self-diagnostic capabilities, which can help identify and troubleshoot issues, making maintenance easier.
  • Load Management: Some Generac controllers can handle load management, prioritizing power distribution to essential appliances, which can be beneficial in preventing overloading.
  • Monitoring and Alerts: Generac controllers often offer monitoring capabilities, allowing you to check the status of the generator remotely and receive alerts in case of any problems.


  • Complexity: Some users may find the controller assembly complex to understand, especially if they are not familiar with generator systems.
  • Compatibility: Ensuring the controller assembly is compatible with your specific generator model is crucial, as using an incompatible assembly can lead to issues.
  • Maintenance and Repair: If the controller assembly fails, it may require specialized knowledge or professional assistance to diagnose and replace, which can be more challenging for DIY users.

Generac 2010 Nexus Replacement Control Board Kit

Generac 2010 Nexus Replacement Control Board Kit

The Generac 2010 Nexus Replacement Control Board Kit is a kit specifically designed to replace the control board of Generac Nexus series generators manufactured in 2010. The control board serves as the central component responsible for managing and controlling the generator’s operation.

Over time, control boards may wear out or malfunction, requiring replacement to ensure the generator’s proper functioning. The Generac 2010 Nexus Replacement Control Board Kit provides a convenient solution for replacing the control board and restoring the functionality of the generator.

It includes all the necessary components and instructions for installation, allowing users to easily upgrade their control system and maintain the reliable operation of their Generac Nexus generator.


  • Cost-Effective Repair: If the original control board in your Generac generator malfunctions, the replacement kit can be a cost-effective way to restore functionality without purchasing a new generator.
  • Preserve Generator Investment: If you have a reliable generator that is older but still in good condition, replacing the control board can extend the lifespan of the generator, protecting your initial investment.
  • Improves Performance: A new control board can enhance the performance of your generator by ensuring proper communication between different components, leading to smoother operation and more accurate system monitoring.
  • Compatible: The control board kit is designed as a replacement for the 2010 Nexus models, ensuring compatibility with the existing wiring and components.
  • Professional Assistance: Installation may require professional expertise, but if done correctly, it can lead to a fully functional generator.


  • Installation Challenges: Installing a control board requires technical skills and knowledge of generator systems. It may be difficult for individuals without experience, leading to the need for professional assistance.
  • Compatibility: Ensure the control board kit matches the exact model and version of your generator. An incorrect match can lead to compatibility issues and malfunctions.
  • Dependence on Electronics: Like any electronic component, the control board is essential for proper generator function. A malfunctioning board can affect the entire system.

Generac Control Board Problems

While Generac control boards are designed to be reliable, they can experience problems. Here are some of the most common issues that you may encounter:

Failure to Start

One of the most frustrating issues you can experience with your generator is a failure to start. If you press the start button, and nothing happens, the problem could be a faulty control board. Other potential causes include a dead battery, a low oil level, or a bad starter motor.


If your generator is overloaded, it can cause serious damage to your control board. Overloading occurs when you exceed the generator’s maximum power output, and it can cause the control board to overheat and fail.

Voltage Issues

Generac control boards are responsible for regulating the voltage output of your generator. If your generator is producing too much or too little voltage, the control board could be to blame. This issue can cause damage to your appliances and electronics and should be addressed immediately.

Frequency Problems

In addition to regulating voltage, control boards are also responsible for maintaining a consistent frequency. If your generator is producing a frequency that is too high or too low, it could cause damage to your electronics and appliances.

How to Identify Control Board Problems?

Now that you know the common issues that can occur with Generac control boards, let’s talk about how to identify them. Here are a few methods you can use:


The first step in identifying control board problems is to troubleshoot your generator. Check the oil level, ensure that the battery is charged, and inspect the starter motor. If you still can’t identify the issue, move on to testing.


If troubleshooting doesn’t reveal the issue, you’ll need to test the control board. You can do this using a multimeter to measure voltage and continuity. If you’re not comfortable doing this yourself, it’s best to hire a professional.

How to Fix Generac’s Generator Control Board Problems?

If you’ve identified an issue with your control board, you’ll need to take steps to fix it. Here are some potential solutions:

Resetting the Control Board

In some cases, resetting the control board can solve the problem. To do this, turn off the generator, disconnect the battery, and wait at least 30 minutes. Reconnect the battery and try starting the generator again.

Replacing the Control Board

If resetting the control board doesn’t resolve the issue, it may be necessary to replace it. However, replacing the control board is a more involved process and should only be attempted by those with experience or by a professional.

Before beginning the replacement process, it’s important to have the proper replacement control board for your generator model.

You can find this information in your generator’s manual or by contacting the manufacturer. To replace the control board, start by disconnecting the battery and any wires connected to the board. Then, remove the old board and install the new one, following the manufacturer’s instructions carefully to ensure a proper installation.

Once the new control board is installed, test the generator to ensure it’s functioning correctly. If you’re unsure about any aspect of the replacement process, don’t hesitate to contact a professional for assistance. A mistake during installation can cause further damage to the generator and create even more problems.

The Control Board

Replacing the control board is a more involved process and should only be attempted by those with experience or by a professional. To replace the control board, you’ll need to disconnect the battery and any wires connected to the board, remove the old board, and install the new one. Make sure to follow the manufacturer’s instructions carefully to ensure a proper installation.

People also ask

How do I reset my Generac generator control panel?

To reset your Generac generator control panel, turn off the generator and unplug any loads connected to it. Locate the “Off/Auto” switch and set it to the “Off” position. Wait for a few seconds before switching it back to “Auto.” This should reset the control panel and restore proper function.

What is the life expectancy of a Generac?

The life expectancy of a Generac generator can vary depending on factors such as usage, maintenance, and environment. However, with proper maintenance and care, a Generac generator can last for decades. Generac offers a standard 5-year limited warranty on most of their generators,

but some models come with extended warranty options for up to 10 years. Regular maintenance, such as oil changes and air filter replacements, can help prolong the life of your generator and keep it running smoothly for years to come.

Is there a recall on Generac generators?

Generac has issued several recalls in the past for various models of their generators. These recalls have been related to issues such as fuel leaks, fire hazards, and carbon monoxide emissions.

It’s important to stay up-to-date on any recalls that may affect your Generac generator, as they can pose serious safety risks. You can check the Generac website or the U.S. Consumer Product Safety Commission’s website for information on any current or past recalls.

Additionally, regular maintenance and inspections can help identify any potential issues with your generator before they become serious problems.

What does the Generac controller do?

The Generac controller is responsible for regulating and monitoring the functions of the generator. It controls the startup and shutdown sequences, monitors the generator’s performance, and provides diagnostic information in the event of a problem.

The controller is typically located on the generator’s control panel and can be accessed by the user for basic monitoring and maintenance. More advanced functions, such as troubleshooting and software updates, may require the assistance of a professional technician.


In conclusion, Generac’s control board problems can arise for a variety of reasons, including power surges, overheating, or simply due to natural wear and tear over time.

These issues can result in a variety of symptoms, such as failure to start, irregular power output, or inconsistent operation. It is important to properly diagnose and address these issues in a timely manner to ensure the safe and reliable operation of your Generac generator.

Regular maintenance and inspections can help to prevent many control board problems from occurring in the first place, while prompt attention to any symptoms that do arise can help to minimize downtime and costly repairs.

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