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Sungrow Error Codes

Complete Australian reference for Sungrow inverter diagnostic codes with professional troubleshooting guidance and repair solutions

Identify issues with your Sungrow solar system and understand proper response procedures for Australian installations

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Sungrow Inverter Models in Australia

Sungrow offers a comprehensive range of premium inverter systems designed for Australian residential and commercial solar installations. The SG series delivers single-phase and three-phase inverter technology with high efficiency compatible with Australian grid standards (230V single-phase / 400V three-phase, 50Hz), while SH series models provide hybrid solutions with battery integration. These diagnostic codes apply to Sungrow inverter systems installed across Australia and comply with AS/NZS 4777.2 grid connection standards. All Sungrow inverters installed in Australia must be installed by CEC (Clean Energy Council) accredited installers. Error indicators appear as status codes on the inverter display, LED status indicators, and status messages in the iSolarCloud monitoring portal, providing comprehensive diagnostic information for system operators and installers.

Reading Error Codes

• Check inverter display for error code numbers or messages
• Review LED status indicators on inverter front panel
• Check iSolarCloud portal for system status messages
• Note error code format and any additional information
• Consult Sungrow installation manual for your specific model

Sungrow Product Series

• SG Series - Single-phase and three-phase inverters (230V/400V, 50Hz)
• SH Series - Hybrid inverters with battery integration
• ST Series - String inverters for commercial systems
• Data Logger - System monitoring and communication
• iSolarCloud - Cloud-based monitoring platform

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Understanding Sungrow Diagnostic Codes

Sungrow inverter systems feature sophisticated diagnostic capabilities that continuously monitor system performance and automatically detect operational issues. When a problem is identified, the system communicates through multiple channels: error codes displayed on the inverter, LED status indicators, and status messages in the iSolarCloud monitoring portal. This comprehensive diagnostic framework enables rapid problem identification and helps determine appropriate response procedures. All Sungrow inverter series (SG, SH, ST) utilise continuous performance monitoring with real-time error detection. Error codes may be displayed as numeric codes (e.g., 102), text messages, or status indicators depending on the model. Sungrow inverters in Australia operate at 230V single-phase or 400V three-phase at 50Hz, complying with AS/NZS 4777.2 standards. Always reference your specific model's installation and service manual for precise code definitions and model-specific information.

Australian Standards Compliance: Sungrow inverters installed in Australia must comply with AS/NZS 4777.2 grid connection standards and be installed by Clean Energy Council (CEC) accredited installers. All electrical work must be performed by licensed electricians in accordance with Australian wiring rules (AS/NZS 3000).

Grid Connection Errors

Issues with AC grid voltage, frequency, and connection parameters.

Code	Meaning	Possible Causes	Solutions
Grid Overvoltage	Grid voltage exceeds maximum limit - System shutdown for safety	•Utility grid voltage too high •Grid voltage fluctuations •Transformer tap settings •Grid instability •Voltage regulation issue •High solar penetration causing voltage rise	Do not attempt to override safety shutdown Check utility grid voltage with calibrated multimeter (should be 230V ±10% for single-phase, 400V ±10% for three-phase) Contact your DNSP (Distribution Network Service Provider) to report voltage issues Request DNSP to lower tap transformer if voltage consistently exceeds 253V (single-phase) or 440V (three-phase) Wait for grid voltage to return to normal range System will automatically reconnect when voltage stabilises within acceptable limits Contact CEC-accredited installer if voltage issues persist
102	Grid Overvoltage Error - Persistent grid voltage above maximum limit	•High solar penetration in area causing voltage rise •DNSP transformer tap set too high •Grid voltage regulation issue •Multiple solar systems feeding into same transformer •Weak grid infrastructure •Voltage rise from high solar export	This is a common issue in Australia due to high solar penetration Contact your DNSP (Distribution Network Service Provider) immediately Request DNSP to lower tap transformer to reduce grid voltage Check grid voltage with calibrated multimeter - should be 230V ±6% (216V-253V) for single-phase For three-phase systems, voltage should be 400V ±6% (376V-440V) Document voltage readings and times when error occurs DNSP may need to adjust transformer tap settings or upgrade infrastructure Consider reducing solar export if system allows (battery storage, export limiting) System complies with AS/NZS 4777.2 and will disconnect when voltage exceeds limits Contact CEC-accredited installer for professional diagnosis
Grid Undervoltage	Grid voltage below minimum limit - System shutdown for safety	•Utility grid voltage too low •Grid voltage fluctuations •Transformer issues •Grid instability •Voltage drop in distribution	Do not attempt to override safety shutdown Check utility grid voltage with calibrated multimeter (should be 230V ±10% for single-phase, 400V ±10% for three-phase) Contact your DNSP (Distribution Network Service Provider) to report voltage issues Wait for grid voltage to return to normal range System will automatically reconnect when voltage stabilises within acceptable limits Contact CEC-accredited installer if voltage issues persist
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 •Grid synchronisation issue	Check grid frequency with calibrated multimeter (should be 50Hz ±0.5Hz for Australian grid) Verify frequency is within allowable limits (49.5Hz to 50.5Hz) Inverter will automatically attempt to reconnect when frequency returns to normal Wait for grid frequency to stabilise Contact your DNSP (Distribution Network Service Provider) if frequency is consistently out of range Contact CEC-accredited 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 behaviour during grid outage Wait for grid power to be restored System will automatically reconnect when grid is restored If grid is normal, contact CEC-accredited installer to check grid connection

DC Voltage and Isolation Errors

Issues with DC input voltage and electrical isolation.

Code	Meaning	Possible Causes	Solutions
DC Overvoltage	DC input voltage exceeds maximum limit	•Too many modules per string •String voltage exceeds maximum •Cold weather voltage rise •Incorrect string configuration •Module mismatch	Check string voltage with calibrated multimeter Verify number of modules per string matches inverter specifications Review string configuration in installation manual Account for cold weather voltage rise in calculations (important in Australian alpine regions) Verify module specifications match system design Contact CEC-accredited installer to verify string configuration
DC Undervoltage	DC input voltage below minimum operating threshold	•Too few modules per string •Shading on panels •Faulty modules •DC wiring losses •String configuration error	Check string voltage with calibrated multimeter Verify minimum number of modules per string Inspect panels for shading (trees, buildings, debris) Check for faulty modules in string Verify DC wiring connections Review string configuration Contact CEC-accredited installer if voltage remains low
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 (especially after heavy rain) Test isolation resistance with megohmmeter (minimum 1 MΩ per AS/NZS 5033) Contact CEC-accredited Sungrow installer immediately This is a serious safety condition requiring professional diagnosis

Temperature and Overheating Errors

Issues with inverter temperature and thermal protection.

Code	Meaning	Possible Causes	Solutions
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 (critical in Australian summer) Check that air vents are not blocked Verify adequate clearance around inverter Check cooling fan operation Allow inverter to cool down before restart Contact CEC-accredited 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 CEC-accredited Sungrow installer for sensor diagnostics May require inverter service

DC Current and Power Errors

Issues with DC current and power generation.

Code	Meaning	Possible Causes	Solutions
DC Overcurrent	DC input current exceeds maximum limit	•Too many modules per string •Short circuit in string •Faulty modules •DC wiring issue •Current exceeds maximum	Check DC current Verify string configuration Inspect for short circuits in string Check for faulty modules Verify DC wiring connections Contact CEC-accredited installer for diagnosis Do not attempt to repair yourself
No DC Power	Inverter not receiving DC power from solar panels	•DC disconnect open •String breakers off •Faulty DC connections •No solar irradiance •Panel failure	Check DC disconnect switches Verify string breakers are ON Inspect DC connections Check for solar irradiance (daytime) Verify panels are generating DC voltage Check for panel or string failures Contact CEC-accredited installer if DC power should be available
Low Power Generation	Energy production significantly below expected levels	•Shading on panels •Dirty or soiled panels •Panel degradation •Inverter derating •DC wiring losses •Mismatched panels	Clean solar panels to remove dirt, dust, or debris Check for shading throughout the day (trees, buildings, debris) Inspect panels for physical damage or hot spots Verify all strings are operating Compare production to expected values for current conditions Check DC wiring for loose connections or damage Review panel specifications and inverter compatibility Contact CEC-accredited installer for production analysis

Communication and Monitoring Errors

Issues with communication and monitoring systems.

Code	Meaning	Possible Causes	Solutions
No Communication with Data Logger	Inverter cannot communicate with Sungrow Data Logger	•Communication wire break •Data Logger offline •Network issue •Communication protocol error	Check communication wiring between inverter and Data Logger Verify Data Logger is powered and online Check network connection Restart Data Logger if needed Verify communication settings Contact CEC-accredited installer if communication cannot be restored
iSolarCloud Not Accessible	iSolarCloud monitoring portal not accessible or showing errors	•Internet connection issue •Data Logger offline •Server connectivity problem •Account access issue	Check internet connection Verify Data Logger is online Check iSolarCloud server status Verify account credentials Restart Data Logger if needed Contact CEC-accredited Sungrow installer if portal remains inaccessible
Modbus Communication Error	Modbus communication failure with external devices	•Modbus wiring issue •Device not responding •Communication protocol error •Address conflict	Check Modbus wiring connections Verify device addresses are correct Test Modbus communication Check for address conflicts Review Modbus configuration Contact CEC-accredited installer for Modbus troubleshooting

Arc Fault and Safety Errors

Critical safety errors related to arc detection.

Code	Meaning	Possible Causes	Solutions
Arc Fault Detected	Arc fault detected in system - potential fire hazard	•Loose DC connections •Damaged DC wiring •Corroded connections •Faulty connectors •Arc in PV array	Immediately shut down the system Do not attempt to restart Contact CEC-accredited installer immediately This is a critical safety condition Inspect all DC connections for looseness Check DC wiring for damage Professional inspection required before restart
Ground Fault Detected	Ground fault protection activated - System shutdown for safety	•DC ground fault •AC ground fault •Wiring issue •Equipment failure	Do not attempt to restart system This is a serious safety condition Immediately contact CEC-accredited installer Do not touch any system components Professional diagnosis required System must be inspected before restart

Internal Inverter Errors

Issues with inverter internal systems and hardware.

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 by power cycling If error persists, contact CEC-accredited Sungrow installer Do not repeatedly restart if error continues Note error code and contact CEC-accredited installer May require inverter replacement or repair
Power Stage Error	Inverter power stage fault	•Power stage failure •IGBT failure •DC/AC conversion issue •Hardware malfunction	Contact CEC-accredited Sungrow installer immediately This requires professional diagnosis Inverter may need repair or replacement Do not attempt to repair yourself
Control Board Error	Inverter control board fault	•Control board failure •Firmware error •Memory error •Internal communication error	Contact CEC-accredited Sungrow installer May require firmware update Professional service may be needed Do not attempt to repair yourself

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Critical Safety Notice

Do not attempt DIY repairs on your Sungrow 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: Isolation Fault, Arc Fault Detected, and Ground Fault Detected. Upon encountering these codes, immediately shut down the system if safe to do so and contact a CEC-accredited Sungrow installer without delay.

Professional service by CEC-accredited installers is mandatory—contact a licensed solar installer or reach out to CEC-accredited Sungrow installer for expert assistance.

Australian Requirements: All inverter repairs must be performed by Clean Energy Council (CEC) accredited installers in accordance with AS/NZS 4777.2 and Australian wiring rules (AS/NZS 3000). Unauthorised work on electrical systems poses extreme danger and violates Australian electrical safety regulations.

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Maintenance Guidelines for Australian Installations

Scheduled Service Requirements

✓Professional inspection and service annually by CEC-accredited Sungrow installer
✓Monthly visual inspection of solar panels for damage, soiling, or bird droppings
✓Clean panels quarterly or as needed based on local conditions (dust, pollen, coastal areas)
✓Monitor system performance daily through iSolarCloud portal
✓Check inverter status and LED indicators monthly
✓Verify Data Logger is online and communicating

Proactive Maintenance Strategies

✓Keep panels clean to maximise energy production
✓Trim trees and vegetation to prevent shading
✓Ensure adequate ventilation around inverter (critical in Australian summer)
✓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

What should I do if I see "Grid Overvoltage" error?

Grid Overvoltage indicates that the grid voltage exceeds the maximum limit. Do not attempt to override the safety shutdown. Check grid voltage with calibrated multimeter (should be 230V ±10% for single-phase, 400V ±10% for three-phase) and contact your DNSP (Distribution Network Service Provider) to report voltage issues. Request DNSP to lower tap transformer if voltage consistently exceeds 253V (single-phase) or 440V (three-phase). Wait for grid voltage to return to normal range. The system will automatically reconnect when voltage stabilises within acceptable limits. Contact a CEC-accredited installer if voltage issues persist.

What is Error 102 (Grid Overvoltage) and why is it common in Australia?

Error 102 indicates persistent grid overvoltage, which is a common issue in Australia due to high solar penetration. When many solar systems export power simultaneously, grid voltage can rise above the maximum limit (253V for single-phase, 440V for three-phase). Contact your DNSP immediately to request lowering the transformer tap. Document voltage readings and times when the error occurs. The DNSP may need to adjust transformer settings or upgrade infrastructure. Consider reducing solar export if system allows (battery storage, export limiting). Your system complies with AS/NZS 4777.2 and correctly disconnects when voltage exceeds limits. Contact CEC-accredited installer for professional diagnosis.

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 (especially after heavy rain), and test isolation resistance with megohmmeter (minimum 1 MΩ per AS/NZS 5033). This is a serious safety condition requiring professional diagnosis. Contact a CEC-accredited Sungrow installer immediately.

What should I do if my inverter shows "Overtemperature"?

Overtemperature indicates that the inverter temperature exceeds the maximum limit. Improve ventilation around the inverter, ensure it is not in direct sunlight (critical in Australian summer), check that air vents are not blocked, verify adequate clearance around the inverter, and check cooling fan operation. Allow the inverter to cool down before restart. Contact a CEC-accredited installer if temperature remains high after improving ventilation.

What does "Arc Fault Detected" mean?

Arc Fault Detected indicates that an arc fault has been detected in the system, which is a potential fire hazard. Immediately shut down the system and do not attempt to restart. Contact a CEC-accredited installer immediately. This is a critical safety condition. Inspect all DC connections for looseness and check DC wiring for damage. Professional inspection is required before restart.

Can I repair my Sungrow system myself?

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

How do I check if my Data Logger is working?

Check Data Logger status in the iSolarCloud 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 CEC-accredited installer if communication cannot be restored.

What should I do if I see "Low Power Generation"?

Low Power Generation indicates that energy production is significantly below expected levels. Clean solar panels to remove dirt, dust, or debris, check for shading throughout the day (trees, buildings, debris), inspect panels for physical damage or hot spots, verify all strings are operating, compare production to expected values for current conditions, check DC wiring for loose connections or damage, and review panel specifications and inverter compatibility. Contact a CEC-accredited installer for production analysis.

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, areas with heavy pollen, or coastal areas may need more frequent cleaning. Keep panels clean to maximise 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 Sungrow solar system troubleshooting in Australian installations. This comprehensive reference enables quick problem identification and guides appropriate response actions. Sungrow systems utilise error codes displayed on inverter displays, LED status indicators, and status messages in the iSolarCloud monitoring portal to indicate specific sensor and system malfunctions. SG, SH, and ST series inverters 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 by CEC-accredited installers. Critical codes demanding urgent response include: Isolation Fault, Arc Fault Detected, and Ground Fault Detected. These indicators represent serious safety hazards requiring certified CEC-accredited Sungrow installer response. Adherence to scheduled maintenance protocols and immediate attention to diagnostic codes extends equipment service life and minimises long-term operational costs. Note that error code formats may vary by model and firmware version—always consult your specific unit's installation and service manual for precise interpretations. All repairs must comply with AS/NZS 4777.2 grid connection standards and Australian wiring rules (AS/NZS 3000).