Troubleshooting Guide: Solar Inverter Error Codes Explained

Samuel Osadolor 6 days agoLast Updated: February 26, 2025

13 minutes read

Solar inverters form the heart of any solar power system, converting DC power generated by solar panels into AC power that can be used by homes and businesses. These inverters are designed to operate reliably for many years, but like any electronic device, they can encounter problems. When something goes wrong, the inverter typically displays an error code. These codes are crucial indicators of specific issues, allowing users to diagnose and address problems without needing to guess.

In this comprehensive guide, we’ll cover everything you need to know about solar inverter error codes, how to troubleshoot them, and what you can do to prevent issues from recurring.

What are Solar Inverter Error Codes?

Solar inverter error codes are messages displayed on the inverter’s screen that help identify system malfunctions or operational anomalies. Modern inverters are equipped with diagnostic systems that monitor various parameters like voltage, current, and internal temperature. When something is out of the normal range, the inverter shuts down and displays a corresponding error code.

These error codes can range from minor issues, like grid disturbances, to more severe problems that may require professional intervention. Understanding what each code represents and how to fix it ensures your solar energy system runs smoothly.

Some common types of issues signaled by error codes include:

Grid faults: Voltage or frequency deviations in the utility grid.
DC side issues: Problems with the connection between the solar panels and the inverter.
Internal inverter faults: Failures within the inverter’s electronic components.
Temperature-related errors: Overheating due to inadequate ventilation.

Each manufacturer provides a solar inverter error codes list in the user manual, making it easier to pinpoint the exact cause of the fault. Still, error codes can vary between models and brands, so it’s essential to consult the specific manual for your system.

Why Solar Inverter Troubleshooting is Crucial

If your solar inverter stops working, your entire solar system shuts down. Without a functioning inverter, the energy collected by the solar panels cannot be converted into usable electricity. This means a potentially significant financial loss, as the system is no longer reducing your energy bills. Regular solar inverter troubleshooting helps prevent these issues by allowing you to catch problems early and resolve them before they escalate.

Besides preventing financial losses, troubleshooting helps to:

Maintain performance: Resolving minor issues can prevent efficiency losses.
Prolong lifespan: Addressing problems quickly helps extend the inverter’s working life.
Avoid major repairs: Early detection of faults can prevent more severe, costly repairs down the line.
Enhance safety: Some error codes indicate safety hazards, such as electrical faults or overheating.

Proactive troubleshooting is especially critical for large commercial systems, where downtime can significantly impact the return on investment (ROI).

Common Solar Inverter Errors

Solar inverters are designed to handle a variety of environmental and operational conditions, but sometimes they encounter faults. Below are some of the most common solar inverter error codes and what they signify:

Error 02

One of the most frequently encountered errors, inverter error code 02, typically refers to issues related to grid voltage. If the voltage in the grid goes out of acceptable bounds, the inverter may shut down to protect itself and the system.

Diagnosis: Check your utility grid voltage to ensure it’s within the inverter’s operational range.
Solution: If the grid voltage fluctuates often, consider contacting your utility company to investigate the cause.

Error 05

Inverter error 05 usually points to a DC input fault, which might be due to an issue with the solar panels, wiring, or connections between the panels and the inverter.

Diagnosis: Inspect all the cables and connectors between the solar panels and the inverter. Look for loose or damaged wires.
Solution: Reconnect or replace faulty cables. If the error persists, test the solar panel output using a voltmeter to ensure the panels are generating sufficient power.

Error Code e02

The inverter e02 code often indicates a temperature-related issue. It could mean the inverter is overheating or that there’s an issue with the internal cooling system.

Diagnosis: Check if the inverter has proper ventilation and that dust or debris isn’t blocking airflow.
Solution: Clean the inverter’s vents and ensure it’s installed in a location with adequate airflow. If the internal temperature sensor is defective, it might need replacement.

Detailed Solar Inverter Error Code List

Different manufacturers and inverter models may display different error codes for similar issues. Having a solar inverter error codes list handy can help when diagnosing problems. Below are some other error codes commonly seen across various brands:

Error Code 04: Communication issues between the inverter’s internal components.
Error Code 10: Frequency deviations, often caused by unstable grid conditions.
Error Code 15: Grid disconnection, usually due to voltage fluctuations or protection systems engaging.

Inverters from popular manufacturers like Sofar Solar or SMA Solar often have their own unique set of fault codes, but they usually follow similar principles.

Resolving Specific Solar Inverter Error Codes

While general error codes cover most problems, specific codes like error code 05 and e02 require targeted troubleshooting:

How to Fix Error 05 on Solar Inverters

To fix inverter error 05, focus on the connection between the solar panels and the inverter:

Step 1: Turn off the system and carefully inspect all connectors and wires.
Step 2: Ensure each connection is tight and secure.
Step 3: Check the output from the solar panels. If the voltage is below expected levels, the problem may lie in the panels themselves.
Step 4: If the panels are working properly, the issue may be with the inverter’s DC input terminals.

What Does Error Code e02 Mean on an Inverter?

The inverter e02 code fix often involves cooling system maintenance. If the inverter overheats, it may automatically shut down to prevent damage.

Step 1: Clean the inverter’s ventilation slots.
Step 2: Ensure the inverter is placed in a well-ventilated area, away from direct sunlight or enclosed spaces.
Step 3: Check the internal temperature sensor. If it’s faulty, consider replacing it or calling a technician for further diagnosis.

Inverter Error Code 04

An inverter error code 04 typically points to a communication failure within the system. This could be a software issue or a fault with the inverter’s internal components.

Solution: Restart the inverter. If this doesn’t resolve the issue, a firmware update might be required. Consult the manufacturer’s support or hire a professional if you’re unsure about updating the firmware yourself.

Resetting and Fixing Solar Inverter Faults

How Do You Reset a Solar Inverter Fault?

Resetting the inverter is often the first step in clearing minor faults. Follow these general steps for resetting your inverter:

Turn off the inverter. Ensure that both the DC and AC disconnect switches are in the off position.
Wait a few minutes to allow any residual power to dissipate.
Turn on the DC switch, followed by the AC switch.
If the fault persists, consult the error code and take additional troubleshooting steps.

For more advanced models, like hybrid solar inverters, the reset procedure might involve additional steps due to the battery integration. Always consult the manual for precise instructions.

Sofar Solar Inverter Troubleshooting

Sofar Solar is a widely recognized brand in the solar industry, offering a range of reliable inverters. However, even Sofar inverters can experience faults. Below are some of the common Sofar solar inverter error codes and their solutions:

Error Code 15: This error often refers to grid disconnection or voltage instability. Check the grid connection and ensure the grid voltage is stable. Contact the utility company if needed.
Error Code 07: This is typically a communication issue between the inverter and external monitoring systems. Ensure all external devices are properly connected and functioning.

In cases where errors persist after basic troubleshooting, it may be best to contact Sofar technical support or a certified technician.

Tools and Techniques for Efficient Solar Inverter Troubleshooting

Solar Inverter Diagnostic Tools

To diagnose inverter errors more efficiently, several solar inverter diagnostic tools can be employed. These tools help verify that both the panels and the inverter are functioning correctly. For example:

Voltmeter: Used to measure the DC output from solar panels.
Inverter monitoring systems: These provide real-time data about inverter performance and may log error codes automatically.

Many modern inverters also offer online monitoring, allowing you to track performance and diagnose problems remotely.

Preventative Maintenance to Avoid Solar Inverter Faults

Preventing solar inverter system errors starts with regular maintenance:

Keep the inverter clean. Dust and dirt can clog ventilation systems, leading to overheating.
Inspect wiring regularly. Loose or damaged wires are a common cause of inverter faults.
Ensure proper ventilation. Inverters should be installed in well-ventilated areas, away from direct sunlight or enclosed spaces.

By performing these preventative measures, you can reduce the likelihood of inverter faults and extend the life of your solar energy system.

When to Call a Professional for Solar Inverter Repairs

While many error codes can be resolved with basic troubleshooting, some issues require professional intervention. If an error persists after trying all recommended solutions, or if the inverter displays a fault related to its internal components, it’s time to call a technician.

Additionally, complex systems like hybrid inverters may involve multiple subsystems, such as battery management, which can make troubleshooting more complex. In such cases, a qualified solar technician with experience in hybrid systems should handle the repair. This helps ensure that any adjustments or replacements are done safely and that warranty terms are not voided by improper handling.

Key Takeaways for Solar Inverter Troubleshooting

Understanding error codes is the first step in identifying and fixing issues with your solar inverter.
Common errors like error 02, error 05, and e02 often indicate issues with grid voltage, DC input faults, or overheating, respectively. Simple fixes like inspecting wiring, resetting the system, or cleaning the inverter can often resolve these.
Advanced issues, particularly with hybrid systems, may require professional attention.
Regular preventative maintenance—including cleaning, ventilation checks, and wiring inspections—can prevent many common inverter faults and extend the life of your system.
Diagnostic tools like voltmeters and online monitoring systems make troubleshooting more efficient and allow for real-time performance tracking.

Solar inverter error codes provide invaluable insight into the health and functionality of your solar energy system. By following the steps outlined in this guide and staying proactive with maintenance, you can minimize system downtime, ensure optimal performance, and safeguard your investment for years to come.

Now that you know how to troubleshoot solar inverter error codes effectively, it’s crucial to keep your system’s manual handy and to stay vigilant with routine maintenance. If you’re unsure or encounter more complex issues, don’t hesitate to reach out to a certified technician. This ensures your solar energy system continues to operate efficiently and without interruption.

Call to Action:

Have you encountered specific inverter error codes that weren’t covered in this guide? Feel free to reach out or consult your inverter’s manual for tailored solutions. Maintaining a well-functioning solar system starts with prompt action—so don’t wait until small issues turn into costly repairs.

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