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SunPower Maxeon Error Codes

Expert reference guide covering all SunPower Maxeon solar system diagnostic codes with comprehensive troubleshooting procedures and professional repair guidance

Quickly identify problems with your SunPower Maxeon solar system and learn the correct response procedures

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SunPower Maxeon Solar Systems

SunPower Maxeon produces premium solar panel systems for residential and commercial installations. Maxeon Solar Technologies, which was spun off from SunPower in 2020, now provides warranty support for SunPower modules. These diagnostic codes are applicable to the majority of SunPower Maxeon solar systems sold in the United States. Error indicators typically manifest as error codes displayed on the inverter display, LED status indicators, and status messages in the monitoring portal. Maxeon offers industry-leading warranties of up to 40 years covering both product and performance aspects.

How to Read Error Codes

• Check inverter display for error codes
• Review LED status indicators on inverter
• Check monitoring portal for system alerts
• Note error code format and any additional information
• Consult SunPower Maxeon documentation
• Contact your local solar installer for support

Warranty and Support

• Maxeon provides warranty support for SunPower modules
• Industry-leading warranties up to 40 years
• Contact your local solar installer first
• Maxeon works with installers for warranty claims
• Visit maxeon.com for support options

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Understanding Diagnostic Codes

SunPower Maxeon solar systems incorporate sophisticated diagnostic capabilities that automatically detect operational issues. When a problem is identified, the system communicates through error codes displayed on the inverter display, LED status indicators, and status messages in the monitoring portal. This intelligent diagnostic framework enables rapid problem identification and helps determine the appropriate response. All SunPower Maxeon solar systems utilize continuous performance monitoring with real-time error detection. Error codes indicate specific system conditions or faults. Always reference your specific system's documentation for precise code definitions. For warranty support, contact your local solar installer first—Maxeon works closely with installers to process warranty claims and provide support.

Grid Connection Errors

Problems with AC grid voltage, frequency, and connection.

Code	Meaning	Possible Causes	Solutions
Grid Voltage Out of Range	Grid voltage outside allowable range - System shutdown for safety	•Utility grid voltage too high •Utility grid voltage too low •Grid voltage fluctuations •Grid instability	Check grid voltage with multimeter Verify voltage is within allowable limits Do not attempt to override safety shutdown Contact utility company if voltage is consistently out of range Wait for grid voltage to return to normal range System will automatically reconnect when voltage stabilizes
Grid Frequency Out of Range	Grid frequency deviation from allowable range - System shutdown	•Grid frequency too high •Grid frequency too low •Grid instability •Frequency fluctuations	Check grid frequency (should be 50Hz or 60Hz depending on region) Verify frequency is within allowable limits Inverter will automatically attempt to reconnect when frequency returns to normal Wait for grid frequency to stabilize Contact utility company if frequency is consistently out of range Contact installer if problem persists
Grid Disconnected	System has lost connection to utility grid	•Grid power outage •Main breaker tripped •Utility disconnect •Grid failure •Anti-islanding protection	Verify grid power is actually lost Check main breaker for system This is normal safety behavior during grid outage Wait for grid power to be restored System will automatically reconnect when grid is restored If grid is normal, contact installer to check grid connection

DC Voltage and Power Errors

Problems with DC input voltage and power generation.

Code	Meaning	Possible Causes	Solutions
DC Overvoltage	DC input voltage exceeds maximum limit	•Too many modules in string •String voltage exceeds maximum •Cold weather voltage rise •Incorrect string configuration •Module mismatch	Check string voltage with multimeter Verify number of modules per string matches inverter specifications Review string configuration in installation manual Account for cold weather voltage rise in calculations Verify module specifications match system design Contact certified installer to verify string configuration
DC Undervoltage	DC input voltage below minimum operating threshold	•Too few modules in string •Shading on panels •Faulty modules •DC wiring losses •String configuration error	Check string voltage with multimeter Verify minimum number of modules per string Inspect panels for shading Check for faulty modules in string Verify DC wiring connections Review string configuration Contact certified installer if voltage remains low
Low Production	Energy production significantly below expected levels	•Shading on panels •Dirty or soiled panels •Panel degradation •Faulty modules •DC wiring issue •Inverter derating	Check weather conditions and solar irradiance levels Inspect panels for shading from trees, buildings, or debris Clean solar panels to remove dirt, dust, or debris Review production data in monitoring app for patterns Check individual module performance Verify DC connections Inspect panels for physical damage Compare current production to historical averages Contact certified installer for production analysis
Zero Production	No energy production from system - Complete production failure	•Grid outage •Inverter offline •Main breaker tripped •System shutdown •DC disconnect open •Inverter failure	Check grid power status Check main AC breaker for system Inspect inverter status Verify system is not in maintenance mode Check for utility grid issues or outages Review monitoring app for system alerts Contact certified installer if grid is normal but production is zero

Ground Fault and Safety Errors

Problems with ground fault detection and electrical safety systems.

Code	Meaning	Possible Causes	Solutions
Ground Fault	Ground fault detected in PV system	•Ground fault in PV array •Damaged module insulation •Water ingress in junction box •DC wiring insulation failure •Ground fault in module	Do not attempt to start the system Inspect all PV modules for physical damage Check all DC connections and junction boxes Test ground fault detection system Check for water ingress in junction boxes Inspect DC wiring for damage or degradation Contact certified installer to perform ground fault testing This is a serious safety condition
Isolation Fault	Isolation error detected between PV system and ground	•Damaged PV module insulation •Water ingress in junction boxes •Damaged DC wiring insulation •Ground fault in PV array •Faulty inverter isolation monitoring	Immediately shut down the system Do not attempt to restart until fault is resolved Inspect all PV module connections and junction boxes Check DC wiring for damage or water ingress Test isolation resistance with megohmmeter Contact certified installer immediately This is a serious safety condition requiring professional diagnosis

Communication and System Errors

Problems with system communication and monitoring.

Code	Meaning	Possible Causes	Solutions
Communication Error	System communication failure - Monitoring system cannot communicate with inverter	•Communication wire break •Inverter not responding •Communication bus failure •Network connectivity problem •Firmware incompatibility	Check communication wiring between inverter and monitoring system Verify inverter is powered and online Check network connection Restart monitoring system Verify firmware compatibility Check for loose or damaged communication cables Contact installer if communication cannot be restored
Monitoring System Offline	Monitoring system is not accessible or showing errors	•Internet connection issue •Monitoring device offline •Server connectivity problem •Account access issue	Check internet connection Verify monitoring device is online Check server status Verify account credentials Restart monitoring device if needed Contact installer if monitoring remains inaccessible

Temperature and Overheating Errors

Problems with inverter temperature and thermal protection.

Code	Meaning	Possible Causes	Solutions
Inverter Overtemperature	Inverter temperature exceeds maximum limit	•Insufficient ventilation •Direct sunlight on inverter •High ambient temperature •Blocked air vents •Faulty cooling fan	Improve ventilation around inverter Ensure inverter is not in direct sunlight Check that air vents are not blocked Verify adequate clearance around inverter Check cooling fan operation Allow inverter to cool down before restart Contact installer if temperature remains high after improving ventilation
Temperature Sensor Error	Temperature sensor fault or communication error	•Faulty temperature sensor •Sensor wiring issue •Internal sensor failure •Communication error	Check temperature sensor connections Verify sensor is functioning Contact installer for sensor diagnostics May require inverter service

Hardware and Internal Errors

Problems with inverter internal systems and hardware components.

Code	Meaning	Possible Causes	Solutions
Internal Inverter Error	Internal inverter fault or hardware error	•Internal inverter fault •Control board issue •Hardware failure •Component malfunction	Attempt inverter restart If error persists, contact installer Do not repeatedly restart if error continues Note error code and contact certified installer May require inverter replacement or repair
Module Failure	Solar module failure detected	•Module hardware failure •Module cell failure •Module degradation •Physical damage	Identify which module has failed Check module for physical damage Contact Maxeon warranty support for module replacement Contact your local solar installer Maxeon works with installers to process warranty claims Do not attempt to repair yourself

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Critical Safety Notice

Do not attempt DIY repairs on your SunPower Maxeon solar system. The majority of diagnostic codes relate to high-voltage DC and AC electrical systems, grid connection safety mechanisms, or critical safety features. Specific codes requiring immediate professional intervention include: Ground Fault, Isolation Fault, and Internal Inverter Error. Upon encountering these codes, immediately shut down the system if safe to do so and contact a certified solar installer without delay.

Professional service is mandatory—contact a licensed solar installer or reach out to Maxeon support for expert assistance.

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Warranty and Support Information

Maxeon Solar Technologies provides warranty support for SunPower modules. Maxeon, which was spun off from SunPower in 2020, has committed to offering warranty support for SunPower modules. Maxeon offers industry-leading warranties of up to 40 years covering both product and performance aspects.

How to Get Support

1.Contact your local solar installer first - Maxeon recommends contacting your installer for any issues with your SunPower system.
2.Maxeon works with installers - Maxeon works closely with installers to process warranty claims and provide support.
3.Warranty coverage - Maxeon's warranty covers Maxeon-manufactured solar modules, but not other components like microinverters.
4.Visit maxeon.com - For additional support options and warranty information, visit the official Maxeon website.

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Maintenance Guidelines

Scheduled Service Requirements

✓Professional inspection and service annually by certified solar installer
✓Monthly visual inspection of solar panels for damage or soiling
✓Clean panels quarterly or as needed based on local conditions
✓Monitor system performance daily through monitoring portal
✓Check inverter status and LED indicators monthly
✓Verify system communication monthly

Proactive Maintenance Strategies

✓Keep panels clean to maximize energy production
✓Trim trees and vegetation to prevent shading
✓Ensure adequate ventilation around inverter
✓Monitor production trends for early problem detection
✓Keep firmware updated for latest features and fixes
✓Review system alerts and error codes promptly

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Frequently Asked Questions

Who provides warranty support for SunPower systems?

Maxeon Solar Technologies provides warranty support for SunPower modules. Maxeon, which was spun off from SunPower in 2020, has committed to offering warranty support. Contact your local solar installer first—Maxeon works closely with installers to process warranty claims and provide support.

What should I do if I see "Ground Fault" error?

Ground Fault indicates a ground fault detected in the PV system. Do not attempt to start the system. Inspect all PV modules for physical damage, check all DC connections and junction boxes, test ground fault detection system, check for water ingress, and inspect DC wiring for damage. This is a serious safety condition. Contact a certified installer to perform ground fault testing.

What should I do if my system is not producing power?

If your system is not producing power, check grid power status, check main AC breaker for system, inspect inverter status, verify system is not in maintenance mode, check for utility grid issues or outages, review monitoring app for system alerts, and contact certified installer if grid is normal but production is zero.

How do I get warranty support for my SunPower modules?

Contact your local solar installer first. Maxeon recommends contacting your installer for any issues with your SunPower system. Maxeon works closely with installers to process warranty claims and provide support. Visit maxeon.com for additional support options and warranty information.

Can I repair my SunPower Maxeon system myself?

High-voltage DC and AC electrical work must exclusively be performed by licensed professionals to ensure safety compliance. Homeowners can safely perform basic tasks like cleaning panels and monitoring the portal, but all technical repairs require certified solar installers. Unauthorized work on electrical systems poses extreme danger and violates building codes.

What should I do if I see "Low Production" error?

Low Production indicates energy production significantly below expected levels. Check weather conditions, inspect panels for shading, clean solar panels, review production data patterns, check individual module performance, verify DC connections, inspect panels for physical damage, compare current production to historical averages, and contact certified installer for production analysis.

What does "Isolation Fault" mean?

Isolation Fault indicates an isolation error detected between the PV system and ground. Immediately shut down the system and do not attempt to restart until the fault is resolved. Inspect all PV module connections and junction boxes, check DC wiring for damage or water ingress, test isolation resistance, and contact a certified installer immediately. This is a serious safety condition requiring professional diagnosis.

How often should I clean my solar panels?

Solar panels should be cleaned quarterly or as needed based on local conditions. Panels in dusty areas or areas with heavy pollen may need more frequent cleaning. Keep panels clean to maximize energy production. Inspect panels monthly for damage or excessive soiling that may require immediate cleaning.

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Summary

Proper interpretation of diagnostic codes is essential for effective SunPower Maxeon solar system troubleshooting. This comprehensive reference enables quick problem identification and guides appropriate response actions. SunPower Maxeon systems utilize error codes displayed on the inverter display, LED status indicators, and status messages in the monitoring portal to indicate specific sensor and system malfunctions. SunPower Maxeon solar systems provide diagnostic information through error codes and monitoring systems for convenient diagnosis.

⚠️Complex diagnostic situations, especially those involving high-voltage DC and AC electrical systems and grid connection safety, require immediate professional evaluation. Critical codes demanding urgent response include: Ground Fault, Isolation Fault, and Internal Inverter Error. These indicators represent serious safety hazards requiring certified solar installer response. For warranty support, contact your local solar installer first—Maxeon works closely with installers to process warranty claims. Adherence to scheduled maintenance protocols and immediate attention to diagnostic codes extends equipment service life and minimizes long-term operational costs. Note that error code formats may vary by model and firmware version—always consult your specific system's documentation for precise interpretations.