Generac Generator 3715 Error Code Explained: Meaning, Causes & Fixes

 

Understanding and Fixing the 3715 Error on a Generac Generator

 

A 3715 error on a Generac generator is a common problem that usually points to an "Undervoltage" situation while the generator is running. This means the generator is not producing enough electricity (voltage) for your home or business needs. This can be a concern for anyone in St Louis or Nashville who relies on their generator for backup power—especially during storms or outages.

If you've never worked with generators before, don't worry! Here's everything you need to know to address and fix the 3715 error safely and effectively.

 

What the 3715 Error Means and Why It Happens

 

The 3715 code refers to an "Undervoltage" alert that pops up when your Generac generator is putting out lower voltage than needed—typically below 80% of normal. Voltage is the electrical pressure that moves electricity, and if it's too low, your appliances and electronics may not run properly or could even get damaged. This can happen because of:

• Problems with the generator’s voltage regulator (the part that keeps the voltage even).
• Issues with the engine speed (like the generator not running fast enough).
• Bad electrical connections or loose wiring.
• Failed sensors or control board problems.
• Dirty or clogged filters or mechanical problems inside the generator.

 

Immediate Safety Steps

 

Before doing anything further, focus on safety. Generators produce high voltage and can be dangerous to work on.

• Turn off the generator if it's running—use the OFF switch on the controller.
• If you have a manual transfer switch, flip it so your house is off grid power and NOT the generator.
• Allow the generator to cool for at least 10–15 minutes before touching any part.

 

Basic Troubleshooting and Checks

 

• Look at your generator’s control panel screen for the exact error. Write down any codes and messages you see.
• Check the main circuit breakers—in some models, these are on the side of the generator. Make sure they haven’t tripped.
• Open the unit (if comfortable), and look for any obvious loose wires. Sometimes, vibrations or weather in St Louis or Nashville can loosen things up.
• Check for signs of rodent damage or corrosion, especially if your generator is outside.
• Look at the air filter, oil level, and fuel level—make sure everything is within the recommended range (if the generator has been running for many hours, it might be time to check the oil and air cleaner).

 

Resetting the Error

 

If the issue seems minor or possibly a fluke, try resetting the code:

• Switch the generator to "OFF" on the control panel, wait 30 seconds.
• Switch to "MANUAL" or "AUTO" mode to power it back on.
• Watch the control panel. If the 3715 error appears again, you’ll need a deeper fix.

 

Next Steps if the Error Persists

 

If the code keeps coming back, it’s usually a sign of one of these issues:

• Faulty Voltage Regulator: This electronic part controls how much voltage the generator produces. If it fails, you will get low voltage. Replacing or adjusting it usually requires a licensed technician.
• Slipping Engine Speed: If the generator engine isn’t running at the right speed (3600 RPM for most models), the voltage will be low. Listen for strange noises, rough running, or notice if maintenance is overdue.
• Loose or Damaged Wiring: Any broken, chewed, or loose wires can interrupt proper voltage output. Only check further if you are comfortable with tools and safety. Otherwise, call a professional for further inspection and repairs.
• Sensor or Control Board Problems: If the generator’s brains—the controller—are faulty, it can cause this error. This requires a skilled repair.
• Bad Circuit Breakers: Occasionally, a breaker inside the generator short-circuits or gets stuck. This also needs professional help to test and replace.

 

When to Call a Professional

 

It’s always safest to contact someone with experience if you aren’t trained in generator systems—especially with electrics involved. In both St Louis and Nashville, expert technicians familiar with Generac systems (like those at full-service providers) have the tools to test voltages, replace a regulator, or track down an electrical problem safely.

Attempting repairs yourself—without experience—risks injury or more expensive damage.

 

How to Prevent the 3715 Error in the Future

 

Keeping your generator running smoothly is important for every home or business owner in St Louis and Nashville:

• Get annual or semi-annual maintenance from a certified expert.
• Keep the area around the generator clean and clear of debris.
• Test your generator monthly (using the test mode or running it under a small load).
• Immediately address any fuel, oil, or air filter issues.
• Look for warning messages on the control panel and act quickly.

If your Generac generator is flashing a 3715 code, start with these checks, reset if possible, and do not hesitate to reach out for professional help in St Louis or Nashville for a complete fix. This keeps your power backup system reliable and safe throughout the year.