Generac Generator 1515 Error Code Explained: Meaning, Causes & Fixes

 

What the 1515 Error Code Means on a Generac Generator

 

The 1515 error code on a Generac generator is a specific warning indicating a problem with the RPM (revolutions per minute) sensor system. When your generator displays the 1515 code, it means the controller (the “brain” of your generator) can’t properly sense how fast the engine is running. This usually points to an issue with the magneto speed sensor, wiring, or sometimes the control board itself. When this problem happens, the generator may not be able to start or run safely, which is why the machine generates this error.

People in St Louis and Nashville sometimes see this code on home or business generators, especially after a big storm or following extended periods of non-use. Understanding this error is important because resolving it quickly ensures you’re never without backup power when you need it.

 

Understanding the RPM Sensor System

 

Your Generac generator has an RPM sensor system, sometimes called a “magneto” sensor, which keeps track of the engine’s speed. The generator’s controller must know this speed to keep the engine running smoothly and at the correct frequency to supply power safely. This is similar to how your car’s dashboard knows your speed through a speed sensor. If the generator’s controller can’t “see” the engine speed, it assumes the engine is not running right and sends out the 1515 code.

 

Common Causes of the 1515 Error

 

The 1515 code does not point to just one issue; it’s more like a general “check engine” light for your generator’s RPM sensing. Here are the most typical causes:

• Defective RPM Sensor (Magneto Speed Sensor): This is one of the most common reasons. The sensor itself may be worn out or have experienced physical damage, especially after storms or if the generator has run for many hours.
• Wiring Issues: Loose, corroded, or damaged wires are frequent causes. If an animal has chewed wiring or moisture has caused corrosion, the signal from the sensor can’t get to the controller.
• Faulty Connections: Sometimes, connectors vibrate loose over time, especially after periods of heavy generator use in St Louis or Nashville, where severe weather can mean longer generator runtimes.
• Control Board Problems: Rarely, the generator’s brain (the control board) fails to “read” the sensor even though the sensor is working fine. This can require a more in-depth repair.
• Accumulated Debris or Moisture: Water intrusion or dust getting into the generator can interrupt the sensor’s operation, especially in regions with variable weather like St Louis and Nashville.

 

What to Do if You See the 1515 Code

 

If you see the 1515 error code on your Generac generator, it’s a good idea to avoid running the unit until the issue is resolved. Here’s what you can do before calling a professional:

• Check for Obvious Issues: Open the generator cover (if safe to do so), and look for anything obviously loose, chewed, wet, or corroded around the wiring harness and sensor area.
• Reset the Generator: Sometimes, the code can appear due to a temporary glitch. Turn the generator off, wait five minutes, then turn it back on. If the code comes back, the problem is persistent.
• Do Not Attempt Complex Repairs Yourself: The RPM sensor and wiring are sensitive and require specific tools and training to test and replace. Working inside a generator without experience can be dangerous due to high voltage, especially after a storm or outage.

If you’re in the St Louis or Nashville area, professionals who specialize in both residential and commercial generator repair, like Hoffman Brothers, regularly handle 1515 errors and can ensure your unit is fixed safely and effectively.

 

How Professionals Diagnose and Fix the 1515 Error

 

When a licensed technician responds to a 1515 RPM sense loss error, here’s what typically happens:

• Visual Inspection: They check for broken wires, loose connectors, water, or animal nests in the generator housing.
• Sensor Testing: Technicians use special meters to test whether the RPM sensor is sending proper signals when the engine is cranking.
• Wiring Checks: Wires are tested for breaks or shorts. Any corroded or damaged wires are replaced.
• Control Board Testing: If the sensor and wiring check out, they will test the controller. If faulty, this may need replacement.
• Reassembly and Testing: After repairs, they restart the generator to make sure the error code is cleared and the engine runs at the correct speed without hiccups.

 

How to Prevent the 1515 Error in the Future

 

Generators in St Louis and Nashville deal with storms, humidity, and sometimes pests, all of which can affect generator wiring and sensors. Here are a few tips for preventing RPM sensor errors:

• Have your generator maintained annually by trained technicians. They will inspect and clean sensor areas, check connections, and catch early signs of trouble.
• Keep the area around your generator clean and clear of debris, plants, or nests that critters might create.
• After any major weather event, inspect the exterior of your unit for damage, even if you don’t notice immediate problems.
• Run your generator periodically (following the manufacturer’s instructions) to keep parts lubricated and identify any issues before you need it in an emergency.

 

Conclusion

 

To sum up, the 1515 error code on a Generac generator signals a problem sensing the engine’s running speed—usually caused by issues with the RPM sensor, wiring, or control board. This code means your generator might not supply backup electricity until it’s fixed. If you see this code, basic visual checks are fine, but major work should be left to professionals with the right tools and training. In both St Louis and Nashville, experienced technicians at full-service companies can quickly identify and resolve the issue, ensuring your home or business stays protected during power outages. Preventative maintenance and prompt attention to error codes help your generator stay reliable for years to come.