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Growatt Error Codes

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

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

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Growatt Inverter Models in Australia

Growatt offers a comprehensive range of premium inverter systems designed for Australian residential and commercial solar installations. The MIN series provides compact single-phase inverter technology, while MOD series models deliver modular solutions with battery integration. MAX series offers high-power three-phase inverters for larger installations compatible with Australian grid standards (230V single-phase / 400V three-phase, 50Hz). These diagnostic codes apply to Growatt inverter systems installed across Australia and comply with AS/NZS 4777.2 grid connection standards. All Growatt 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 monitoring portal, providing comprehensive diagnostic information for system operators and installers.

Reading Error Codes

• Check inverter display for error code numbers (e.g., 101, 102, 202, 203, 300)
• Review LED status indicators on inverter front panel
• Check monitoring portal for system status messages
• Note error code format and any additional information
• Consult Growatt installation manual for your specific model

Growatt Product Series

• MIN Series - Compact single-phase inverters (230V, 50Hz)
• MOD Series - Modular inverters with battery integration
• MAX Series - High-power three-phase inverters (400V, 50Hz)
• ARK Series - Battery storage solutions
• Monitoring - System monitoring and communication

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Understanding Growatt Diagnostic Codes

Growatt 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 monitoring portal. This comprehensive diagnostic framework enables rapid problem identification and helps determine appropriate response procedures. All Growatt inverter series (MIN, MOD, MAX, ARK) utilise continuous performance monitoring with real-time error detection. Error codes are typically three-digit numbers (e.g., 101, 102, 202, 203, 300, 302, 303, 304, 305, 411, 423, 424, 425, 426, 427, 428) 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: Growatt 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).

Communication and System Errors

Issues with communication and internal system components.

Code	Meaning	Possible Causes	Solutions
101	Communication Error - Inverter cannot establish connection to other devices or systems	•Communication wire break •Data logger offline •Network issue •Communication protocol error •Device not responding	Restart the inverter by power cycling Check communication wiring connections Verify data logger is powered and online Check network connection If error persists, contact CEC-accredited Growatt installer
102	Permanent Error - Permanent fault, possibly caused by grid problems	•Grid problems •Internal fault •System error •Hardware failure	Restart the inverter by power cycling If error occurs again or persists after restart, check the grid Verify grid voltage (should be 230V ±10% for single-phase, 400V ±10% for three-phase) and frequency (50Hz ±0.5Hz) Check for grid anomalies Contact your DNSP (Distribution Network Service Provider) if grid issues persist If problem persists, contact CEC-accredited Growatt installer
116	EEPROM Error - Error in non-volatile memory of inverter	•EEPROM memory fault •Memory corruption •Internal memory error •Data storage failure	Contact CEC-accredited Growatt installer This requires professional diagnosis EEPROM may need to be reprogrammed or replaced
117	Relay Error - Problem with internal relay of inverter	•Faulty relay •Relay stuck •Relay circuit failure •Internal relay malfunction	Contact CEC-accredited Growatt installer This requires professional diagnosis Relay may need to be replaced
118	Initialisation Error - Inverter could not be properly initialised	•Startup failure •Initialisation sequence error •System boot failure •Configuration error	Contact CEC-accredited Growatt installer This requires professional diagnosis System may need to be reset or reconfigured
119	GFCI Error - Error in ground fault circuit interrupter	•GFCI fault •Ground fault detection error •GFCI circuit failure •Safety system error	Contact CEC-accredited Growatt installer immediately This is a safety-related error requiring professional diagnosis Do not attempt to bypass GFCI
120	HCT Error - Problem with high current transformer	•HCT fault •Transformer failure •Current sensing error •Hardware malfunction	Contact CEC-accredited Growatt installer This requires professional diagnosis Transformer may need to be replaced
121	Main CPU Error - Error in main control unit of inverter	•CPU fault •Control board issue •Processor error •Internal control failure	Restart the inverter by power cycling If error persists, contact CEC-accredited Growatt installer This may require control board replacement
122	Bus Voltage Error - Irregularities in bus voltage of inverter	•Bus voltage fault •DC bus problem •Voltage regulation error •Internal power stage issue	Contact CEC-accredited Growatt installer This requires professional diagnosis Internal power stage may need repair

DC Voltage and Isolation Errors

Issues with DC input voltage and electrical isolation.

Code	Meaning	Possible Causes	Solutions
202	DC Input Overvoltage - DC input voltage exceeds maximum allowable value	•Too many modules in series •String voltage exceeds maximum •Cold weather voltage rise •Incorrect string configuration •Module mismatch	Immediately disconnect DC switch Check voltage of each string with calibrated multimeter If string voltage is less than 550V, contact CEC-accredited Growatt installer Verify number of modules per string matches inverter specifications Account for cold weather voltage rise in calculations (important in Australian alpine regions) Reduce number of modules if necessary Contact CEC-accredited installer to verify string configuration
203	PV Isolation Low - Low insulation values in PV system	•Damaged cables or modules •Water ingress in junction boxes •Damaged DC wiring insulation •Ground fault in PV array •Moisture in connections	Check if PV panel housing is properly grounded 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) If error message persists, contact CEC-accredited Growatt installer This is a serious safety condition requiring professional diagnosis
411	PV Voltage Low - PV voltage is too low	•Too few modules in series •Shading on panels •Faulty modules •DC wiring losses •Poor contact in connections •String configuration error	Check PV connections for poor contact problems Verify PV voltage is within required range If everything on PV side is OK, try restart in this order for MIN-XH/MOD-XH+ARK XH system: Turn off battery → turn off DC switch of inverter → turn off AC side Then start battery → turn on DC switch → turn on AC side Inspect panels for shading (trees, buildings, debris) Check for faulty modules in string If error persists, contact CEC-accredited Growatt installer

AC Grid Connection Errors

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

Code	Meaning	Possible Causes	Solutions
300	AC 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 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 If error message persists even though grid voltage is in acceptable range, contact CEC-accredited Growatt installer Wait for grid voltage to return to normal range System will automatically reconnect when voltage stabilises within acceptable limits
302	No AC Connection - Inverter detects no connection to AC grid	•AC wiring disconnected •Main breaker tripped •AC switch off •Grid connection failure •Wiring issue	Check AC wiring after shutdown Verify AC connections are secure Check main breaker for system Ensure AC switch is turned on If error message persists, contact CEC-accredited Growatt installer
303	PE Abnormal - Abnormal voltage between neutral and PE (ground)	•PE wiring issue •Neutral-ground fault •Grounding problem •AC wiring error	Check PE to ensure PE wire is properly contacted Check neutral and PE voltage Check AC wiring Verify proper grounding Restart inverter If error still exists, contact CEC-accredited Growatt installer
304	AC Frequency Out of Range - Grid frequency outside allowable range	•Grid frequency too high •Grid frequency too low •Grid instability •Frequency fluctuations •Grid synchronisation issue	Check AC wiring, especially neutral and ground Check if grid frequency meets local requirements (should be 50Hz ±0.5Hz for Australian grid) Restart inverter Verify frequency is within allowable limits (49.5Hz to 50.5Hz) If error still exists, contact CEC-accredited Growatt installer Contact your DNSP if frequency is consistently out of range
305	Overload Error - Output load of inverter exceeds allowable range	•Excessive load •Load exceeds inverter capacity •Overcurrent condition •Load imbalance	Check if output load exceeds range If load is too high, reduce it Verify load does not exceed inverter specifications Check for load imbalances If error message persists, contact CEC-accredited Growatt installer

Internal Inverter Errors

Issues with inverter internal systems and power stages.

Code	Meaning	Possible Causes	Solutions
423	AC PWM Bypass Protection - Protection triggered due to problem in AC PWM bypass	•AC PWM bypass fault •Bypass circuit error •Internal power stage issue •Hardware malfunction	Restart the inverter by power cycling If error message still persists, contact CEC-accredited Growatt installer This may require professional diagnosis
424	INV Current Fault - Error detected in inverter current	•Inverter current sensing error •Current measurement fault •Power stage issue •Hardware malfunction	Restart the inverter by power cycling If error message still persists, contact CEC-accredited Growatt installer This may require professional diagnosis
425	AFCI Self-Test Error - Error in AFCI self-test	•AFCI self-test failure •Arc fault detection error •AFCI circuit fault •Safety system error	Restart the inverter by power cycling If error message still persists, contact CEC-accredited Growatt installer This is a safety-related error requiring professional diagnosis
426	PV Current Sensing Fault - Error in PV current sensing	•PV current sensor fault •Current measurement error •Sensor wiring issue •Hardware malfunction	Restart the inverter by power cycling Check PV current sensors If error message still persists, contact CEC-accredited Growatt installer
427	AC Current Sensing Fault - Error in AC current sensing	•AC current sensor fault •Current measurement error •Sensor wiring issue •Hardware malfunction	Restart the inverter by power cycling Check AC current sensors If error message still persists, contact CEC-accredited Growatt installer
428	BOOST Converter Short Circuit - Short circuit in BOOST converter	•BOOST converter failure •Short circuit in power stage •Hardware malfunction •Component failure	Contact CEC-accredited Growatt installer immediately This is a serious hardware fault Do not attempt to restart Professional diagnosis and repair required

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Critical Safety Notice

Do not attempt DIY repairs on your Growatt 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: 203 (PV Isolation Low), 428 (BOOST Converter Short Circuit), and 119 (GFCI Error). Upon encountering these codes, immediately shut down the system if safe to do so and contact a CEC-accredited Growatt installer without delay.

Professional service by CEC-accredited installers is mandatory—contact a licensed solar installer or reach out to CEC-accredited Growatt 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 Growatt 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 monitoring 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 101 (Communication Error) mean?

Error code 101 indicates that the inverter cannot establish connection to other devices or systems. Restart the inverter by power cycling, check communication wiring connections, verify data logger is powered and online, and check network connection. If the error persists, contact CEC-accredited Growatt installer.

What does error code 202 (DC Input Overvoltage) mean?

Error code 202 indicates that the DC input voltage exceeds the maximum allowable value. Immediately disconnect the DC switch, check voltage of each string with calibrated multimeter, verify number of modules per string matches inverter specifications, and account for cold weather voltage rise (important in Australian alpine regions). If string voltage is less than 550V, contact CEC-accredited Growatt installer.

What should I do if I see error code 203 (PV Isolation Low)?

Error code 203 indicates low insulation values in the PV system. Check if PV panel housing is properly grounded, 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. If the error message persists, contact CEC-accredited Growatt installer.

What does error code 300 (AC Voltage Out of Range) mean?

Error code 300 indicates that the grid voltage is outside the allowable range. Check grid voltage with calibrated multimeter (should be 230V ±10% for single-phase, 400V ±10% for three-phase) and verify it is within allowable limits. Do not attempt to override the safety shutdown. Contact your DNSP (Distribution Network Service Provider) if voltage is consistently out of range and request them to lower tap transformer if voltage consistently high. If error message persists even though grid voltage is in acceptable range, contact CEC-accredited Growatt installer.

What should I do if my inverter shows error code 411 (PV Voltage Low)?

Error code 411 indicates that the PV voltage is too low. Check PV connections for poor contact problems and verify PV voltage is within required range. If everything on PV side is OK, try restart in this order for MIN-XH/MOD-XH+ARK XH system: Turn off battery → turn off DC switch of inverter → turn off AC side. Then start battery → turn on DC switch → turn on AC side. Inspect panels for shading (trees, buildings, debris) and check for faulty modules in string. If error persists, contact CEC-accredited Growatt installer.

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

What does error code 428 (BOOST Converter Short Circuit) mean?

Error code 428 indicates a short circuit in the BOOST converter. Contact CEC-accredited Growatt installer immediately. This is a serious hardware fault. Do not attempt to restart. Professional diagnosis and repair is required.

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 Growatt solar system troubleshooting in Australian installations. This comprehensive reference enables quick problem identification and guides appropriate response actions. Growatt systems utilise numeric error codes displayed on inverter displays, LED status indicators, and status messages in the monitoring portal to indicate specific sensor and system malfunctions. MIN, MOD, MAX, and ARK 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: 203 (PV Isolation Low), 428 (BOOST Converter Short Circuit), and 119 (GFCI Error). These indicators represent serious safety hazards requiring certified CEC-accredited Growatt 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).