5 Most Common Generac IQ3500 Problems (Solutions Included)

If you own a Generac IQ3500 then chances are you may have encountered some problems with it. These can be anything from not starting up to randomly shutting down. The good news is that most of these issues are fixable with a little bit of troubleshooting. Today we’ll look at the most common Generac IQ3500 issues and how to effectively troubleshoot them.

Table of Contents

What Is The Generac IQ3500?

The Generac IQ3500 is a portable inverter generator. It provides you with up to 3,500 watts of power while weighing only 68 pounds, making it ideal for households who need a reliable source of energy but don’t have the space or weight capacity for a larger standby generator. It’s also fuel efficient and comes with a 3-year limited warranty. It also has plenty of customizable options and the ability to adjust its wattage output accordingly, this inverter generator is a great choice for those who want reliable performance without having to worry about weight or space restrictions.

Generac IQ3500 Problems

1. Control Panel Not Working Problem

If the control panel on your Generac IQ3500 isn’t working correctly there are a few potential causes like;

  • A tripped circuit breaker
  • Faulty wiring connections
  • Bad or dead battery
  • Generator not connected properly
  • Faulty/ damaged control panel

Troubleshooting The Control Panel Not Working Problem

  • Check that the circuit breaker has not been tripped and if it has been then reset it.
  • Inspect the wiring for any loose connections or damage and repair them as necessary.
  • Replace the battery if needed and check that it is properly connected to ensure that power is being delivered to the control panel.
  • Verify that all wires are securely connected between your Generac IQ3500 generator and the main electrical service panel. This should ensure that both power sources are being delivered properly to the control panel for optimal performance.
  • If none of the above solutions work then unfortunately you may have a faulty control panel on your hands and will need to replace it with a new one in order to get your Generac IQ3500 back up and running again properly.

2. Low Power Output Problem

The Generac IQ3500 is a powerful and reliable generator however sometimes it can suffer from lower power output than you expect. And some possible causes for this are;

  • A gas tank with low fuel
  • Wrong fuel being used
  • Clogged air filter
  • A damaged or worn spark plug

Troubleshooting The Lower Power Output Problem

  • First and foremost make sure that your fuel tank is full and that the correct type of fuel is used.
  • You should always use gasoline with an octane rating of 87 or higher. If you’re unsure of the type of fuel to use consult your Generac IQ3500 owner’s manual for guidance.
  • Check the air filter regularly as part of your maintenance schedule and replace it if necessary.
  • You may need to replace your spark plug if it’s worn out or corroded.

3. Gas Leaks And Exhaust Problems

The Generac IQ3500 can sometimes experience gas leaks and/or exhaust problems. And these problems may include;

  • Faulty fuel lines
  • Faulty gas cap or fuel gage
  • Blocked exhaust system

Troubleshooting The Gas Leaks And Exhaust Problems

  • Start by closely inspecting the lines that are used to carry fuel from the tank to the engine. Look for any signs of damage or wear-and-tear such as cracks, splits, or holes. If any of these are found they should be replaced.
  • Make sure both are properly installed and functioning as expected. Replace any components that are not working correctly with original parts from Generac.
  • Clean out any exhaust blockages found in order to restore proper operation of your Generac IQ3500 generator.

4. Engine Problems

The Generac IQ3500 is a reliable and powerful generator and this is in part due to its engine, however it is not perfect and these problems are usually the result of;

  • An old or dirty air filter
  • Low or old fuel
  • Oil level that’s too low
  • Spark plugs that need replacing
  • Loose or corroded electrical connections

Troubleshooting Engine Problems

  • Check the air filter and replace if necessary.
  • Fill the fuel tank with fresh fuel.
  • Make sure the oil level is correct or full.
  • Replace spark plugs if necessary (it is recommended to use a spark plug wrench to ensure proper installation.)
  • Check all electrical connections for corrosion or looseness and make sure they’re secured tightly
  • If these steps do not work then you should contact a qualified mechanic to help with further diagnosis and repair of your Generac IQ3500 generator engine problem.

5. Regulator Problem

The Generac IQ3500 is renowned for its longevity but it is not immune to problems. One of the more common issues is a regulator issue. This occurs when the device does not recognize a voltage input that has been put and it is caused by;

  • A damaged or worn out regulator
  • Faulty wiring

Troubleshooting The Regulator Problem

  • Check the regulator for any signs of damage or wear and tear that could indicate a voltage input issue.
  • If everything looks good check that all wires are connected properly by using a multimeter or other appropriate measuring tool.
  • Make sure you know which wire goes where before proceeding.
  • Make sure to test your generator before using it as normal. This will help ensure that it runs correctly and efficiently for many years to come.

How To Prevent Problems With The Generac IQ3500

  • Inspect your spark plug regularly for signs of wear and tear and replace it if necessary.
  • Check your oil level often and keep it topped up as needed.
  • Make sure to check the fuel filter regularly and replace it when necessary.
  • Properly tighten all hardware connections and make sure all mounting bolts are tight to minimize excessive vibration.
  • Clean or replace the air filter on a regular basis as part of your preventative maintenance routine.

How Do I Know When My [Generac IQ3500] Generator Needs Maintenance?

Most Generac generators will display a “Service Needed” light when maintenance is required. This indicator light should be checked periodically, so you can stay on top of maintenance and keep your Generac IQ3500 running optimally.

What Does It Mean When My [Generac IQ3500] Generator Runs But Doesn’t Produce Power?

This usually means that there’s an issue with your transfer switch or electrical panel wiring. You will have to check these components for any signs of damage and make sure they’re properly connected before attempting to use the Generac IQ3500 generator again.


The Generac IQ3500 generator is a great piece of machinery but it can present some common issues if not maintained properly. Fortunately these issues are often easy to fix and can be solved with a few simple steps. Whether you’re looking for an emergency back-up power source or just an easy way to power your recreational activities the Generac IQ3500 makes it easier than ever to keep your home supplied with the power you need. Ultimately it all depends on taking the right steps to troubleshoot and prevent these common problems then your Generac IQ3500 will be sure to provide you with a reliable performance.