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Huawei FusionSolar Error Codes

Expert reference guide covering all Huawei FusionSolar inverter diagnostic codes with comprehensive troubleshooting procedures and professional repair guidance

Quickly identify problems with your Huawei FusionSolar system and learn the correct response procedures

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Huawei FusionSolar Inverter Models

Huawei FusionSolar produces an extensive lineup of premium inverter systems for residential and commercial solar installations. The SUN2000 series represents advanced inverter technology with high efficiency and smart features, while FusionSolar systems provide integrated solutions with monitoring and management capabilities. These diagnostic codes are applicable to the majority of Huawei FusionSolar inverter systems sold in the United States. Error indicators typically manifest as alarm IDs on the inverter display, LED status indicators, and status messages in the FusionSolar monitoring portal.

How to Read Error Codes

• Check inverter display for alarm ID numbers (e.g., 2011, 2012, 2063, 2064)
• Review LED status indicators on inverter
• Check FusionSolar portal for system status messages
• Note alarm ID format and any additional information
• Consult Huawei documentation for your specific model

Huawei FusionSolar Product Series

• SUN2000 Series - Advanced high-efficiency inverters
• FusionSolar - Integrated solar system solutions
• Smart PV - Intelligent monitoring and management
• Data Logger - System monitoring and communication
• FusionSolar App - Mobile monitoring platform

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Understanding Diagnostic Codes

Huawei FusionSolar inverter systems incorporate sophisticated diagnostic capabilities that automatically detect operational issues. When a problem is identified, the system communicates through alarm IDs displayed on the inverter, LED status indicators, and status messages in the FusionSolar monitoring portal. This intelligent diagnostic framework enables rapid problem identification and helps determine the appropriate response. All Huawei FusionSolar inverter series (SUN2000, FusionSolar) utilize continuous performance monitoring with real-time error detection. Alarm IDs are typically four-digit numbers (e.g., 2011, 2012, 2063, 2064, 2065, 2066, 2067, 2068, 2069, 2070) that indicate specific system conditions or faults. Always reference your specific model's installation manual for precise code definitions.

DC String and Wiring Errors

Problems with PV string connections, polarity, and DC wiring.

Code	Meaning	Possible Causes	Solutions
2011	String Reverse Polarity - PV string polarity is reversed	•Incorrect DC cable connections •Reversed polarity in PV string •Wrong wiring of PV modules •DC cable polarity error	Turn off the inverter Check and correct the polarity of DC cables Verify PV module wiring is correct Ensure positive and negative connections are correct Turn the inverter back on after correction Contact certified installer if polarity cannot be corrected
2012	String Reverse Current - Reverse current detected in PV string	•Defective diodes in PV modules •Module failure •String reverse current flow •Faulty bypass diodes	Turn off the inverter Check PV modules for defective diodes Replace defective modules or diodes Inspect modules for physical damage Test string current direction Turn the inverter back on after repair

Isolation and Ground Fault Errors

Problems with electrical isolation and ground fault detection.

Code	Meaning	Possible Causes	Solutions
2063	Isolation Fault - Low insulation resistance between PV strings and ground	•Damaged cables or modules •Water ingress in junction boxes •Damaged DC wiring insulation •Ground fault in PV array •Moisture in connections	Turn off the inverter Check wiring and modules for damage Inspect all PV module connections and junction boxes Check DC wiring for damage or water ingress Test isolation resistance with megohmmeter Repair any found damage Contact certified Huawei installer immediately This is a serious safety condition requiring professional diagnosis
2065	Ground Fault - Ground fault detected in PV system	•Defective insulation •Faulty components •Cable insulation failure •Ground fault in wiring •Component failure	Turn off the inverter Check system for ground faults Inspect cable insulation Test for ground faults in wiring Repair or replace faulty components Fix any found faults Turn the inverter back on after repair Contact certified installer if fault persists

DC Voltage Errors

Problems with DC input voltage levels.

Code	Meaning	Possible Causes	Solutions
2066	DC Overvoltage - DC input voltage exceeds allowable range	•Too many modules in series •String voltage exceeds maximum •Cold weather voltage rise •Incorrect string configuration •Module mismatch	Turn off the inverter Check number of modules connected in series Verify string configuration matches inverter specifications Account for cold weather voltage rise in calculations Reduce number of modules if necessary Verify module specifications match system design Turn the inverter back on after correction Contact certified installer to verify string configuration
2067	DC Undervoltage - DC input voltage below allowable range	•Too few modules in series •Shading on panels •Faulty modules •DC wiring losses •String configuration error	Turn off the inverter Check number of modules connected in series Verify minimum number of modules per string Inspect panels for shading Check for faulty modules in string Increase number of modules if necessary Verify DC wiring connections Turn the inverter back on after correction

Grid Connection Errors

Problems with AC grid voltage, frequency, and connection.

Code	Meaning	Possible Causes	Solutions
2068	Grid Frequency Out of Range - Grid frequency outside allowable range	•Grid frequency too high •Grid frequency too low •Grid instability •Frequency fluctuations •Grid synchronization issue	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
2069	Grid Voltage Out of Range - Grid voltage outside allowable range	•Utility grid voltage too high •Utility grid voltage too low •Grid voltage fluctuations •Grid instability •Voltage regulation issue	Check grid voltage 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 Contact certified installer if voltage issues persist
2070	Grid Loss - Inverter has lost connection to grid	•Grid power outage •Main breaker tripped •Utility disconnect •Grid failure •Anti-islanding protection	Check grid connection Verify grid power is actually lost Check main breaker for system Ensure grid switch is turned on 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

Temperature and Overheating Errors

Problems with inverter temperature and thermal protection.

Code	Meaning	Possible Causes	Solutions
2070	Overtemperature - Inverter temperature exceeds allowable range	•Insufficient ventilation •Direct sunlight on inverter •High ambient temperature •Blocked air vents •Faulty cooling fan	Check installation environment for adequate ventilation Improve ventilation around inverter Ensure inverter is not in direct sunlight Reduce ambient temperature if possible Check that air vents are not blocked Verify adequate clearance around inverter Turn off inverter and allow to cool down Turn inverter back on after cooling Contact installer if temperature remains high after improving ventilation

Internal Inverter Errors

Problems with inverter internal systems and hardware.

Code	Meaning	Possible Causes	Solutions
2064	Device Fault - Serious fault in internal circuit of device	•Internal circuit fault •Hardware defect •External factors such as grid problems •Control board issue •Component malfunction	Update inverter firmware to latest version Turn off AC and DC switches Check grid voltage and frequency for anomalies Check insulation of input and output cables Wait 5 minutes Turn switches back on If error persists, contact Huawei support Do not attempt to repair yourself

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Critical Safety Notice

Do not attempt DIY repairs on your Huawei FusionSolar 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: 2063 (Isolation Fault), 2065 (Ground Fault), and 2064 (Device Fault). Upon encountering these codes, immediately shut down the system if safe to do so and contact a certified Huawei FusionSolar installer without delay.

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

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Maintenance Guidelines

Scheduled Service Requirements

✓Professional inspection and service annually by certified Huawei FusionSolar 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 FusionSolar portal
✓Check inverter status and LED indicators monthly
✓Verify Data Logger is online and communicating

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 alarm IDs promptly

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Frequently Asked Questions

What does alarm ID 2011 (String Reverse Polarity) mean?

Alarm ID 2011 indicates that the polarity of a PV string is reversed. Turn off the inverter, check and correct the polarity of DC cables, verify PV module wiring is correct, ensure positive and negative connections are correct, and turn the inverter back on after correction. Contact a certified installer if polarity cannot be corrected.

What does alarm ID 2063 (Isolation Fault) mean?

Alarm ID 2063 indicates a low insulation resistance between PV strings and ground. Turn off the inverter, check wiring and modules for damage, inspect all PV module connections and junction boxes, check DC wiring for damage or water ingress, and test isolation resistance. This is a serious safety condition requiring professional diagnosis. Contact a certified Huawei installer immediately.

What should I do if I see alarm ID 2064 (Device Fault)?

Alarm ID 2064 indicates a serious fault in the internal circuit of the device. Update inverter firmware to the latest version, turn off AC and DC switches, check grid voltage and frequency for anomalies, check insulation of input and output cables, wait 5 minutes, and turn switches back on. If the error persists, contact Huawei support. Do not attempt to repair yourself.

What does alarm ID 2066 (DC Overvoltage) mean?

Alarm ID 2066 indicates that the DC input voltage exceeds the allowable range. Turn off the inverter, check the number of modules connected in series, verify string configuration matches inverter specifications, account for cold weather voltage rise, reduce the number of modules if necessary, and turn the inverter back on after correction. Contact a certified installer to verify string configuration.

What should I do if my inverter shows alarm ID 2070 (Overtemperature)?

Alarm ID 2070 indicates that the inverter temperature exceeds the allowable range. Check the installation environment for adequate ventilation, improve ventilation around the inverter, ensure it is not in direct sunlight, reduce ambient temperature if possible, turn off the inverter and allow it to cool down, then turn it back on after cooling. Contact an installer if temperature remains high after improving ventilation.

Can I repair my Huawei FusionSolar 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 FusionSolar portal, but all technical repairs require certified Huawei FusionSolar installers. Unauthorized work on electrical systems poses extreme danger and violates building codes.

How do I check if my Data Logger is working?

Check Data Logger status in the FusionSolar portal. Verify the Data Logger is powered and online, check the network connection, and verify communication settings. If the Data Logger is offline, check communication wiring between the inverter and Data Logger, restart the Data Logger if needed, and contact an installer if communication cannot be restored.

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 Huawei FusionSolar system troubleshooting. This comprehensive reference enables quick problem identification and guides appropriate response actions. Huawei FusionSolar systems utilize alarm IDs displayed on inverter displays, LED status indicators, and status messages in the FusionSolar monitoring portal to indicate specific sensor and system malfunctions. SUN2000 and FusionSolar series inverters provide diagnostic information through alarm IDs 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: 2063 (Isolation Fault), 2065 (Ground Fault), and 2064 (Device Fault). These indicators represent serious safety hazards requiring certified Huawei FusionSolar installer response. Adherence to scheduled maintenance protocols and immediate attention to diagnostic codes extends equipment service life and minimizes long-term operational costs. Note that alarm ID formats may vary by model and firmware version—always consult your specific unit's installation and service manual for precise interpretations.