SunPower Maxeon Solar System Error Codes

Inverter Errors

Error codes related to solar inverter operation, communication, and power conversion issues.

Code	Meaning	Possible Causes	Solutions
E1	Inverter Communication Error - Inverter not communicating with monitoring system	•Communication module failure •Network connection issue •WiFi/Ethernet configuration error •Inverter firmware issue •Communication cable disconnected •Monitoring system offline	Check network connection status Verify WiFi/Ethernet configuration Check communication cable connections Restart inverter if safe to do so Update inverter firmware if available Check monitoring system status Contact SunPower support for advanced diagnostics
E2	Inverter Overvoltage Error - DC voltage exceeds maximum limit	•Too many solar panels connected •String voltage too high •Inverter voltage rating exceeded •Faulty voltage sensor •Configuration error	Verify solar panel string configuration Check total DC voltage does not exceed inverter maximum Review system design and panel count Test voltage sensor Contact installer to verify system configuration Reduce string voltage if necessary
E3	Inverter Undervoltage Error - DC voltage below minimum operating level	•Insufficient solar panel output •Shading on panels •Faulty panel connections •String voltage too low •Inverter minimum voltage not met	Check for shading on solar panels Verify all panel connections are secure Check panel output during peak sun hours Inspect for damaged panels Verify string configuration is correct Check weather conditions affecting output
E4	Inverter Overcurrent Error - Current exceeds maximum safe limit	•Short circuit in DC wiring •Faulty panel connection •Inverter current rating exceeded •Faulty current sensor •Ground fault	Immediately shut down system if safe to do so Check for short circuits in DC wiring Inspect all DC connections Test current sensors Check for ground faults Contact qualified technician for repair
E5	Inverter Overheating Error - Inverter temperature too high	•Inadequate ventilation •Ambient temperature too high •Inverter fan failure •Dust buildup blocking airflow •Inverter overloaded	Ensure adequate ventilation around inverter Check inverter fan operation Clean dust and debris from inverter Verify inverter is not in direct sunlight Check ambient temperature Reduce load if possible Allow inverter to cool down
E6	Inverter Ground Fault Error - Ground fault detected in system	•Ground fault in DC wiring •Faulty panel grounding •Inverter ground fault detection circuit issue •Water intrusion in connections	Shut down system immediately Check all DC wiring for ground faults Verify proper grounding of all components Inspect for water intrusion Test ground fault detection circuit Contact qualified technician for repair

Solar Panel and Array Errors

Error codes related to solar panel performance, string configuration, and array issues.

Code	Meaning	Possible Causes	Solutions
E7	Panel String Mismatch Error - String voltage or current mismatch detected	•Different panel types in same string •Damaged panel in string •String configuration error •Mismatched string voltages •Faulty panel bypass diode	Verify all panels in string are same type and rating Check for damaged or underperforming panels Test individual panel outputs Verify string configuration matches design Check bypass diodes Reconfigure strings if necessary
E8	Low Panel Output Error - Solar panel output below expected level	•Shading on panels •Dirty or soiled panels •Damaged panels •Faulty panel connections •Panel degradation •Weather conditions	Check for shading from trees, buildings, or debris Clean solar panels if dirty Inspect panels for physical damage Verify all panel connections are secure Test individual panel outputs Check weather and sunlight conditions
E9	Panel Disconnect Error - Panel string disconnected or open circuit	•Loose panel connections •Broken wiring •Faulty panel junction box •MC4 connector failure •String fuse blown	Check all panel connections Inspect wiring for breaks or damage Test MC4 connectors Check panel junction boxes Verify string fuses Test continuity of string wiring
E10	Array Isolation Error - Array isolation switch activated or fault detected	•Isolation switch activated •Isolation fault in array •Safety system activation •Ground fault in array •Emergency shutdown activated	Check isolation switch position Verify safety system status Check for ground faults Review system logs for shutdown reason Reset isolation switch if safe Contact qualified technician if fault persists

Monitoring and Communication Errors

Error codes related to system monitoring, data logging, and communication systems.

Code	Meaning	Possible Causes	Solutions
E11	Monitoring System Offline - Monitoring system not communicating	•Network connection lost •Monitoring device failure •Power loss to monitoring device •Configuration error •Server connectivity issue	Check network connection Verify monitoring device power Restart monitoring device Check WiFi/Ethernet configuration Verify internet connectivity Contact monitoring service provider
E12	Data Logging Error - System unable to log performance data	•Storage full •Memory card failure •Data logging module failure •Firmware issue •Corrupted data	Check available storage space Replace memory card if necessary Clear old data if possible Update firmware Reset data logging module Contact support for advanced troubleshooting
E13	Sensor Communication Error - Sensor not responding or providing invalid data	•Sensor failure •Sensor wiring issue •Sensor disconnected •Faulty sensor calibration •Communication bus error	Check sensor connections Test sensor operation Verify sensor wiring Calibrate sensor if possible Replace sensor if faulty Check communication bus connections

Grid and AC Connection Errors

Error codes related to grid connection, AC output, and utility interaction.

Code	Meaning	Possible Causes	Solutions
E14	Grid Connection Error - Inverter unable to connect to utility grid	•Grid voltage out of range •Grid frequency out of range •Utility grid down •AC disconnect switch open •Grid connection fault	Check grid voltage and frequency Verify AC disconnect switch is closed Check utility grid status Wait for grid to stabilize Contact utility company if grid is down Verify grid connection settings
E15	AC Overvoltage Error - AC output voltage exceeds safe limits	•Grid voltage too high •Inverter AC output regulation failure •Transformer issue •Grid instability	Check utility grid voltage Verify inverter AC output settings Contact utility if grid voltage is high Check inverter AC regulation Wait for grid to stabilize
E16	AC Undervoltage Error - AC output voltage below minimum	•Grid voltage too low •Inverter AC output issue •Transformer issue •Grid instability	Check utility grid voltage Verify inverter AC output Contact utility if grid voltage is low Check inverter AC regulation Wait for grid to stabilize
E17	Islanding Detection Error - Inverter detected islanding condition	•Grid disconnected while inverter running •Anti-islanding protection activated •Utility grid fault •Safety system activation	Verify grid connection status Wait for grid to reconnect Check utility grid status System will automatically reconnect when grid is stable Contact utility if grid fault persists

System and Safety Errors

Error codes related to system-level issues, safety systems, and critical faults.

Code	Meaning	Possible Causes	Solutions
F1	System Shutdown Error - Critical system fault requiring shutdown	•Critical safety fault •Multiple system failures •Emergency shutdown activated •System protection activated •Critical component failure	Do not attempt to restart without diagnosis Review all error codes and system logs Check all safety systems Verify all connections are secure Contact qualified technician immediately Do not bypass safety systems
F2	Emergency Shutdown Error - Emergency shutdown system activated	•Manual emergency shutdown •Safety system activation •Fire detection •Critical fault detected •Emergency stop button pressed	Verify reason for emergency shutdown Check all safety systems Inspect for fire or smoke Do not restart until cause is identified Contact emergency services if fire detected Contact qualified technician for system reset
F3	Firmware Error - Inverter firmware corruption or update failure	•Firmware corruption •Failed firmware update •Incompatible firmware version •Memory error •Software bug	Do not attempt firmware update without proper knowledge Contact SunPower support for firmware update Verify firmware version compatibility Backup current configuration before update Follow manufacturer update procedures exactly Contact qualified technician for assistance
F4	Power Supply Error - Inverter internal power supply failure	•Internal power supply failure •Power supply component failure •Voltage regulation failure •Component overheating	Check inverter power supply status Verify AC power to inverter Check for component damage Contact qualified technician for repair Do not attempt internal repairs

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Important Information

If you encounter persistent errors or are unable to resolve an issue using the solutions provided, contact SunPower customer support or a qualified solar system technician for professional assistance. Solar systems involve high voltage DC and AC electricity, which can be extremely dangerous. Never attempt to repair electrical components, wiring, or panels yourself unless you are a qualified and certified solar technician. Different SunPower Maxeon system configurations may have model-specific error codes—always consult your system's documentation and monitoring portal for the most accurate information.

For technical support, contact SunPower customer service or consult a qualified solar system technician for expert assistance.

Safety Information: Solar systems operate at high voltages that can cause serious injury or death. Always shut down the system properly before any work. DC electricity from solar panels is present whenever the sun is shining, even if the inverter is off. Never work on solar systems during daylight hours without proper safety equipment and training. Always follow lockout/tagout procedures. Working with solar systems requires specialized training and certification. If you are unsure about any procedure, contact a qualified technician immediately. Never bypass safety systems or attempt repairs you are not qualified to perform.

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Troubleshooting Guidelines

Common Resolution Steps

✓Check monitoring portal for detailed error information
✓Verify system is properly shut down before any inspection
✓Check for shading on solar panels
✓Verify network connection for monitoring system
✓Check inverter ventilation and temperature
✓Document error codes and system status for service calls
✓Contact qualified technician for electrical issues

Prevention Strategies

✓Schedule regular professional maintenance
✓Keep solar panels clean and free of debris
✓Monitor system performance regularly
✓Ensure adequate inverter ventilation
✓Keep system documentation accessible
✓Maintain proper network connectivity
✓Follow manufacturer maintenance schedule

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Frequently Asked Questions

What should I do if my SunPower Maxeon system shows error code E1?

Error code E1 indicates an inverter communication error. Check the network connection, verify WiFi/Ethernet configuration, check communication cable connections, restart the inverter if safe to do so, and check the monitoring system status. Contact SunPower support for advanced diagnostics if the issue persists.

How do I fix an inverter overvoltage error (E2)?

Error code E2 indicates DC voltage exceeds maximum limits. Verify solar panel string configuration, check that total DC voltage does not exceed inverter maximum, review system design and panel count, and contact your installer to verify system configuration. Do not attempt to modify string configuration yourself.

What causes low panel output error (E8)?

Error code E8 indicates solar panel output is below expected levels. Check for shading on panels, clean dirty or soiled panels, inspect for damaged panels, verify all panel connections are secure, test individual panel outputs, and check weather and sunlight conditions.

How do I resolve a grid connection error (E14)?

Error code E14 indicates the inverter cannot connect to the utility grid. Check grid voltage and frequency, verify AC disconnect switch is closed, check utility grid status, wait for grid to stabilize, and contact the utility company if the grid is down. The system will automatically reconnect when the grid is stable.

What should I do if I see error code F1 (system shutdown)?

Error code F1 indicates a critical system fault requiring shutdown. Do not attempt to restart without diagnosis. Review all error codes and system logs, check all safety systems, verify all connections are secure, and contact a qualified technician immediately. Do not bypass safety systems.

How often should I maintain my SunPower Maxeon system?

Regular maintenance helps prevent many error codes. Keep solar panels clean and free of debris, monitor system performance regularly through the monitoring portal, ensure adequate inverter ventilation, schedule professional maintenance annually, and follow manufacturer recommendations for your specific system.

Can I repair SunPower Maxeon systems myself?

Some basic troubleshooting like checking monitoring portal, verifying network connections, and cleaning panels can be done safely. However, all electrical work, wiring repairs, panel repairs, and inverter repairs must be performed by qualified and certified solar technicians. Solar systems involve high voltage DC and AC electricity that can be extremely dangerous. Always contact a qualified technician for electrical issues.

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Summary

Proper interpretation of SunPower Maxeon solar system error codes is essential for efficient troubleshooting and maintenance. This comprehensive reference enables quick problem identification and guides appropriate response actions. SunPower Maxeon systems display error codes through monitoring portals, inverter displays, or indicator lights to indicate specific issues. Understanding these codes helps maintain system performance and maximizes energy production. SunPower Maxeon manufactures premium solar panels and complete solar energy systems including residential and commercial installations, each with model-specific features and error code systems. This guide provides diagnostics and solutions for all common SunPower Maxeon solar system error codes.

ℹ️For persistent errors or issues that cannot be resolved using this guide, contact SunPower customer support or consult a qualified solar system technician for professional assistance. Some errors may require technical support, component replacement, or specialized diagnostic equipment. Always document error codes and symptoms when contacting support for faster resolution. Note that error code formats may vary by system model and software version—always consult your specific system's documentation and monitoring portal for the most accurate information. Safety should always be the top priority when working with solar systems. Solar systems involve high voltage DC and AC electricity that can cause serious injury or death. Never work on solar systems unless you are a qualified and certified solar technician. Always follow proper safety procedures and lockout/tagout protocols.