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GoodWe Error Codes

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

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

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GoodWe Inverter Models in Australia

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

Reading Error Codes

• Check inverter display for error code numbers (e.g., 01, 02, 03, 07, 12, 102, 108, 120, 302)
• Review LED status indicators on inverter front panel
• Check SEMS portal for system status messages
• Note error code format and any additional information
• Consult GoodWe installation manual for your specific model

GoodWe Product Series

• GW Series - Standard high-efficiency inverters (230V/400V, 50Hz)
• HT Series - High-voltage inverters for large systems
• EH Series - Hybrid inverters with battery integration
• Data Logger - System monitoring and communication
• SEMS Portal - Cloud-based monitoring platform

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Understanding GoodWe Diagnostic Codes

GoodWe 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: numeric error codes displayed on the inverter, LED status indicators, and status messages in the SEMS monitoring portal. This comprehensive diagnostic framework enables rapid problem identification and helps determine appropriate response procedures. All GoodWe inverter series (GW, HT, EH) utilise continuous performance monitoring with real-time error detection. Error codes are typically numeric (e.g., 01, 02, 03, 07, 12, 25, 102, 108, 120, 302) that indicate specific system conditions or faults. Always reference your specific model's installation and service manual for precise code definitions and model-specific information.

Australian Standards Compliance: GoodWe 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).

Internal Communication and System Errors

Issues with internal communication and system components.

Code	Meaning	Possible Causes	Solutions
01	SPI Error - Internal communication error	•SPI communication failure •Internal bus error •Control board issue •Communication protocol error	Disconnect grid output and DC input switches Wait 5 minutes for system to reset Reconnect both switches If problem is not resolved, contact CEC-accredited GoodWe installer This may require professional diagnosis
02	EEPROM R/W Error - Memory chip error	•EEPROM memory fault •Memory read/write error •Memory corruption •Data storage failure	Disconnect grid output and DC input switches Wait 5 minutes for system to reset Reconnect both switches If problem is not resolved, contact CEC-accredited GoodWe installer EEPROM may need to be reprogrammed or replaced
12	LCD Communication Error - Communication error between LCD-DSP and Master-DSP	•LCD communication failure •Display communication error •Internal bus error •Control board issue	Disconnect grid output and DC input switches Wait 5 minutes for system to reset Reconnect both switches If problem is not resolved, contact CEC-accredited GoodWe installer This may require control board replacement

Grid Connection Errors

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

Code	Meaning	Possible Causes	Solutions
03	Grid Frequency Error - Grid frequency exceeds inverter limit	•Grid frequency too high •Grid frequency too low •Grid instability •Frequency fluctuations •Grid synchronisation issue	Check current grid frequency (should be 50Hz ±0.5Hz for Australian grid) Verify frequency is within allowable limits (49.5Hz to 50.5Hz) Wait for grid frequency to stabilise Inverter will automatically reconnect when frequency returns to normal Contact your DNSP (Distribution Network Service Provider) if frequency is consistently out of range Contact CEC-accredited installer if problem persists
102	Grid Frequency Out of Range - Grid frequency outside allowable range	•Grid frequency too high •Grid frequency too low •Grid instability •Frequency fluctuations	Check grid frequency (should be 50Hz ±0.5Hz for Australian grid) Verify frequency is within allowable limits (49.5Hz to 50.5Hz) Wait for grid frequency to stabilise Contact your DNSP if frequency is consistently out of range Contact CEC-accredited installer if problem persists
108	Grid Voltage Fluctuation - Voltage fluctuations in grid	•Grid voltage instability •Voltage fluctuations •Grid regulation issue •Transformer problems	Check grid voltage stability with calibrated multimeter Verify voltage is within allowable limits (230V ±10% for single-phase, 400V ±10% for three-phase) Wait for grid voltage to stabilise Contact your DNSP if voltage fluctuations persist Request DNSP to lower tap transformer if voltage consistently high Contact CEC-accredited installer if problem continues
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	Check grid voltage with calibrated multimeter (should be 230V ±10% for single-phase, 400V ±10% for three-phase) Verify voltage is within allowable limits Do not attempt to override safety shutdown Contact your DNSP (Distribution Network Service Provider) if voltage is consistently out of range Request DNSP to lower tap transformer if voltage consistently high Wait for grid voltage to return to normal range System will automatically reconnect when voltage stabilises within acceptable limits
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 (anti-islanding protection) 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 in series •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 in series •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
120	Isolation Test Failed - Isolation test failed	•PV system isolation below threshold •Damaged module insulation •DC wiring insulation failure •Ground fault present •Moisture in connections	Do not attempt to start the system Inspect all PV modules for physical damage Check all DC connections and junction boxes Test isolation resistance with megohmmeter (minimum 1 MΩ per AS/NZS 5033) Check for water ingress in junction boxes (especially after heavy rain) Inspect DC wiring for damage or degradation Contact CEC-accredited installer to perform isolation testing This is a serious safety condition requiring immediate attention
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 (minimum 1 MΩ per AS/NZS 5033) Contact CEC-accredited GoodWe installer immediately This is a serious safety condition requiring professional diagnosis

Relay and Hardware Errors

Issues with relay operation and hardware components.

Code	Meaning	Possible Causes	Solutions
07	Relay Self-Test Error - Error in relay self-test	•Relay fault •Relay self-test failure •Relay stuck •Relay circuit failure	Disconnect grid output and DC input switches Wait 5 minutes for system to reset Reconnect both switches If problem is not resolved, contact CEC-accredited GoodWe installer Relay may need to be replaced
25	Relay Self-Test Error - Error in relay self-test	•Relay fault •Relay self-test failure •Relay stuck •Relay circuit failure	Disconnect grid output and DC input switches Wait 5 minutes for system to reset Reconnect both switches If problem is not resolved, contact CEC-accredited GoodWe installer Relay may need to be replaced

Communication and Monitoring Errors

Issues with external communication and monitoring systems.

Code	Meaning	Possible Causes	Solutions
302	Smart Meter Communication Error - Communication problem between inverter and Smart Meter	•Smart meter communication failure •Modbus communication error •Wiring issue •Meter not responding •Communication protocol error	Check communication wiring between inverter and smart meter Verify smart meter is powered and online Check Modbus communication settings Test communication connection Restart inverter if needed Contact CEC-accredited installer if communication cannot be restored
Data Logger Communication Error	Inverter cannot communicate with 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
SEMS Portal Not Accessible	SEMS 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 SEMS server status Verify account credentials Restart data logger if needed Contact CEC-accredited GoodWe installer if portal remains inaccessible

Temperature and Overheating Errors

Issues with inverter temperature and thermal protection systems.

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 (critical in Australian summer) Ensure inverter is not in direct sunlight Check that air vents are not blocked Verify adequate clearance around inverter (minimum 500mm recommended) 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 GoodWe installer for sensor diagnostics May require inverter service

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 If error persists, contact CEC-accredited GoodWe installer Do not repeatedly restart if error continues Note error code and contact certified 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 GoodWe installer immediately This requires professional diagnosis Inverter may need repair or replacement Do not attempt to repair yourself

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Critical Safety Notice

Do not attempt DIY repairs on your GoodWe 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: 120 (Isolation Test Failed), Isolation Fault, and Power Stage Error. Upon encountering these codes, immediately shut down the system if safe to do so and contact a CEC-accredited GoodWe installer without delay.

Professional service by CEC-accredited installers is mandatory—contact a licensed solar installer or reach out to CEC-accredited GoodWe 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 GoodWe 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 SEMS 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 does error code 01 (SPI Error) mean?

Error code 01 indicates an internal communication error. Disconnect grid output and DC input switches, wait 5 minutes for system to reset, and reconnect both switches. If the problem is not resolved, contact CEC-accredited GoodWe installer. This may require professional diagnosis.

What does error code 03 (Grid Frequency Error) mean?

Error code 03 indicates that the grid frequency exceeds the inverter limit. Check current grid frequency (should be 50Hz ±0.5Hz for Australian grid) and verify it is within allowable limits (49.5Hz to 50.5Hz). Wait for grid frequency to stabilise. The inverter will automatically reconnect when frequency returns to normal. Contact your DNSP (Distribution Network Service Provider) if frequency is consistently out of range.

What should I do if I see error code 120 (Isolation Test Failed)?

Error code 120 indicates that the isolation test failed. Do not attempt to start the system. Inspect all PV modules for physical damage, check all DC connections and junction boxes, test isolation resistance with megohmmeter (minimum 1 MΩ per AS/NZS 5033), and check for water ingress (especially after heavy rain). This is a serious safety condition. Contact a CEC-accredited installer to perform isolation testing.

What does error code 302 (Smart Meter Communication Error) mean?

Error code 302 indicates a communication problem between the inverter and Smart Meter. Check communication wiring between inverter and smart meter, verify smart meter is powered and online, check Modbus communication settings, test communication connection, and restart inverter if needed. Contact CEC-accredited installer if communication cannot be restored.

What should I do if I see error code 108 (Grid Voltage Fluctuation)?

Error code 108 indicates voltage fluctuations in the grid. Check grid voltage stability with calibrated multimeter, verify voltage is within allowable limits (230V ±10% for single-phase), wait for grid voltage to stabilise, contact your DNSP if voltage fluctuations persist, and request DNSP to lower tap transformer if voltage consistently high. Contact CEC-accredited installer if problem continues.

Can I repair my GoodWe 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 SEMS portal, but all technical repairs require certified CEC-accredited GoodWe installers. Unauthorised work on electrical systems poses extreme danger and violates Australian electrical safety regulations and building codes.

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

If your inverter shows a temperature error, improve ventilation around inverter (critical in Australian summer), ensure it is not in direct sunlight, check that air vents are not blocked, verify adequate clearance around inverter (minimum 500mm recommended), 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.

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 GoodWe solar system troubleshooting in Australian installations. This comprehensive reference enables quick problem identification and guides appropriate response actions. GoodWe systems utilise numeric error codes displayed on inverter displays, LED status indicators, and status messages in the SEMS monitoring portal to indicate specific sensor and system malfunctions. GW, HT, and EH 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: 120 (Isolation Test Failed), Isolation Fault, and Power Stage Error. These indicators represent serious safety hazards requiring certified CEC-accredited GoodWe 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).