Generac Generator Troubleshooting: Tips and Solution In 2023

Generac generator troubleshooting, Generac generators are known for their reliability and durability, but like any mechanical device, they can experience problems from time to time.

If you own a Generac generator and it’s not working as it should, don’t panic. Many common issues can be easily resolved with basic troubleshooting.

In this article, we’ll cover the most common Generac generator problems and provide tips on how to troubleshoot and fix them.

Generac generator troubleshooting

Generac Generator Troubleshooting

Generac generators are designed to provide reliable power in emergency situations or remote locations. However, if your generator isn’t working correctly, it can be frustrating and even dangerous.

Before you call a professional, it’s essential to troubleshoot the problem to determine if it’s something you can fix on your own.

In this article, we’ll guide you through the most common Generac generator issues and offer solutions to get your generator back up and running.

Generator Won’t Start

If your Generac generator won’t start, there are several potential causes to consider:

Battery Issues

If your generator has an electric starter, the battery might be dead. Check the battery terminals and cables to ensure they are clean and secure. If the battery is dead, you may need to replace it.

Fuel Issues

Generators need fuel to operate, so if the fuel tank is empty or the fuel is stale, your generator won’t start.

Check the fuel level and make sure the fuel is fresh. If the fuel is old, drain the tank and replace it with fresh fuel.

Spark Plug Issues

A dirty or damaged spark plug can prevent your generator from starting. Check the spark plug and clean or replace it if necessary.

Low Oil Pressure

Generac generators have an oil pressure switch that prevents the engine from starting if the oil pressure is low.

Check the oil level and add oil if necessary. If the oil level is correct, the oil pressure switch may be faulty and need to be replaced.

Generator Shuts Down During Operation

If your generator shuts down while in operation, there could be several possible causes:


Generac generators have a safety feature that shuts the generator down if it is overloaded. Check to make sure you’re not running too many appliances or devices that exceed the generator’s capacity.

Low Oil Pressure

If the oil pressure drops below a safe level while the generator is running, the generator will shut down automatically.

Check the oil level and add oil if necessary. If the oil level is correct, the oil pressure switch may be faulty and need to be replaced.

Dirty Air Filter

A dirty air filter can reduce airflow to the engine and cause it to shut down. Check the air filter and clean or replace it if necessary.

Generator Has No Power Output

If your generator isn’t producing any power, there could be several possible causes:

Faulty Voltage Regulator

The voltage regulator regulates the amount of voltage produced by the generator. If it’s faulty, the generator may not produce any power. Check the voltage regulator and replace it if necessary.

Broken Alternator

If the generator engine is running, but it still does not produce any power, then the alternator may be broken.

The alternator is responsible for generating the electrical power in the generator. If it is broken, it needs to be replaced.

You can test the alternator by using a multimeter to measure the voltage output. If the voltage reading is zero, then the alternator is likely broken and needs to be replaced.

Damaged Wiring

If the wiring that connects the generator to your appliances is damaged or disconnected, your generator won’t produce any power. Check the wiring and repair or replace it if necessary.

Generac Propane Generator Troubleshooting

Here are some troubleshooting tips for Generac propane generators:

  • Engine fails to start: check fuel pressure, fuel supply, and spark plug.
  • Low power output: Check fuel supply and air filter.
  • Engine shuts off: Check low oil pressure, clogged air filter, and fuel supply.

People also ask

What are the most common problems with Generac generators?

Some of the most common problems with Generac generators include battery failure, low oil pressure,

clogged air filters, fuel system problems, and issues with the generator producing no power output. Regular maintenance can help prevent these issues.

How do I reset my Generac generator?

To reset a Generac generator, turn off all appliances, turn off the generator, wait for a few minutes, and then turn it back on.

What would cause a Generac generator not to start?

There could be several reasons why a Generac generator won’t start, such as a dead battery, low oil pressure, clogged air filter, dirty spark plug, or fuel system problems.

What does the red light mean on a Generac generator?

The red light on a Generac generator typically indicates that there is a problem with the generator.

The specific meaning of the red light can vary depending on the model of the generator, but it may indicate low oil pressure, a battery problem, or a fault in the generator’s electrical system.

It is important to consult the owner’s manual or a certified Generac technician to properly diagnose and address the issue indicated by the red light.


In conclusion, troubleshooting a Generac generator involves a systematic approach to identify and resolve common issues that may prevent it from operating effectively.

By following the manufacturer’s guidelines and seeking professional assistance when needed, generator owners can ensure their unit is reliable and ready to provide power when it’s most needed.

Regular maintenance and proper care also play a crucial role in preventing many of the common problems that can arise with Generac generators, ultimately ensuring their long-term functionality and peace of mind during power outages.

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