Growatt Inverter Error Codes and Troubleshooting in Australia
Updated 9 September 2026 · By SolarNevs Research Desk, Dealer surveys + verified sources · 2 sources · Method ↗
Key Takeaways
- Growatt inverters display error codes to indicate operational issues, ranging from minor grid fluctuations to critical safety faults.
- Many common errors, like "AC over voltage" (Error 104), are often temporary grid-related issues that the inverter will self-correct.
- Safety-critical faults, such as "PV isolation low" (Error 101) or "AFCI fault" (Error 114), require immediate professional inspection and should not be ignored.
- Always contact an accredited solar installer for any persistent or safety-related error codes.
Understanding Growatt Inverter Error Codes in Australia
When your Growatt solar inverter displays an error code, it's communicating a specific issue that is preventing it from operating correctly. These codes help diagnose problems, from temporary grid fluctuations to internal hardware faults or safety concerns. In Australia, some common errors relate to grid conditions, particularly during periods of high solar generation.
What is actually going on when your Growatt inverter shows an error?
Your Growatt inverter continuously monitors various parameters, including the voltage and frequency of the grid, the power coming from your solar panels, and its own internal components. When any of these parameters fall outside their permitted operating ranges, the inverter triggers an error code and may shut down or reduce its output to protect itself, your home, or the electricity grid.
For example, if the grid voltage rises too high, the inverter will display an "AC over voltage" error (Error 104) and disconnect from the grid. This is a protective measure mandated by Australian standards like AS/NZS 4777.2, ensuring the grid remains stable and safe. Similarly, if the inverter detects a potential electrical arc in your DC wiring, it will show an "AFCI fault" (Error 114 or Error 200) and shut down to prevent a fire risk.
Growatt Inverter Error Code Table
The following table lists common Growatt inverter error codes, their meanings, and recommended actions. Note that some codes are documented by Australian installers, while others come directly from Growatt's official resources.
Code | What it means | What to do | Source |
|---|---|---|---|
Error 100 | PV over voltage | Check the PV input voltage. If it exceeds the inverter’s maximum limit, contact your installer. | PSW Energy |
Error 101 | PV isolation low | This indicates a potential insulation fault in the DC wiring or solar panels, which can be a safety hazard. Contact your installer. | PSW Energy |
Error 102 | PV input configuration | Check the PV string configuration. Ensure the voltage and current are within the inverter’s operating range. Contact your installer. | PSW Energy |
Error 103 | DC injection too high | Restart the inverter. If the error persists, contact your installer. This may indicate an internal measurement fault. | PSW Energy |
Error 104 | AC over voltage | This is a common grid voltage issue. The inverter will automatically restart when grid voltage normalises. If persistent, contact your installer to assess grid conditions or adjust volt-watt settings. | PSW Energy |
Error 105 | AC frequency out of range | The inverter will automatically restart when grid frequency normalises. If persistent, contact your installer. | PSW Energy |
Error 106 | AC connection fault | Check AC wiring and circuit breakers. Ensure the inverter is properly connected to the grid. If persistent, contact your installer. | PSW Energy |
Error 107 | Ground fault | This is a safety-critical fault indicating current leakage to earth. Contact your installer immediately. | PSW Energy |
Error 108 | Temperature too high | Check inverter ventilation. Clear any obstructions. If the error persists in normal ambient temperatures, contact your installer. | PSW Energy |
Error 109 | Fan fault | Check for fan obstructions. Restart the inverter. If the fan is clear and the error persists, contact your installer for fan replacement. | PSW Energy |
Error 110 | Internal communication error | Restart the inverter. If the error persists, contact your installer for service. | PSW Energy |
Error 111 | Relay fault | Restart the inverter. If the error persists, contact your installer. This indicates an internal hardware fault. | PSW Energy |
Error 112 | EEPROM fault | Restart the inverter. If the error persists, contact your installer. This indicates an internal memory fault. | PSW Energy |
Error 113 | DSP fault | Restart the inverter. If the error persists, contact your installer. This indicates an internal processor fault. | PSW Energy |
Error 114 | AFCI fault | This indicates a potential arc fault in the DC wiring, which is a fire risk. Contact your installer immediately. | PSW Energy |
Error 200 | AFCI fault | Check the panel terminal after shutdown. Restart the inverter. If the error message still occurs, contact: service@growatt.tech. | Growatt |
Error 201 | Leakage current too high | Restart the inverter. If the error message still occurs, contact service@growatt.tech. | Growatt |
Error 202 | DC input voltage exceeds maximum tolerated value | Immediately disconnect the DC switch and check the voltage. If the error code still occurs after restoring normal voltage, contact service@growatt.tech | Growatt |
Error 203 | PV isolation Low | After turning off, check that the panel housing is properly grounded. If the error message still occurs, contact service@growatt.tech. | Growatt |
Error 300 | AC V range | Check the line voltage. If the error message still occurs even though the line voltage is within the acceptable range, contact service@growatt.tech | Growatt |
Error 301 | AC terminals inverted | Check the AC terminals. If the error message still occurs, contact service@growatt.tech | Growatt |
Error 302 | No AC connection | Check the AC wiring after shutdown. If the error message still occurs, contact service@growatt.tech | Growatt |
Error 303 | NE abnormal | Check the PE to make sure the PE line contacts properly. If the error message still occurs, contact service@growatt.tech | Growatt |
Error 304 | AC F Outrange | Restart the inverter. If the error message still occurs, contact service@growatt.tech | Growatt |
Error 305 | Overload error | Check whether the output load exceeds the range; if the load is too high, reduce it. If the error message still occurs, contact service@growatt.tech | Growatt |
Error 306 | CT LN Reversed | After turning off, check the SP-CT connection. If the error message still occurs, contact service@growatt.tech | Growatt |
Error 307 | Communication error, M3 did not receive SP-CT | Check the communication cable. If the error message still occurs, contact service@growatt.tech | Growatt |
Error 400 | DC overload | Restart the inverter. If the error message still occurs, contact service@growatt.tech | Growatt |
Error 401 | DC high voltage fault | Restart the inverter. If the error message still occurs, contact service@growatt.tech | Growatt |
Error 402 | current too high | Restart the inverter. If the error message still occurs, contact service@growatt.tech. | Growatt |
Error 403 | Unbalanced output current | After shutdown, check whether the output current is unbalanced. If the error message still occurs, contact service@growatt.tech | Growatt |
Error 404 | bus sampling error | Restart the inverter. If the error message still occurs, contact service@growatt.tech | Growatt |
Error 405 | Relay error | Restart the inverter. If the error message still occurs, contact service@growatt.tech | Growatt |
Error 406 | Initialization error | Restart the inverter. If the error message still occurs, contact service@growatt.tech | Growatt |
Error 407 | Self-test error | Restart the inverter. If the error message still occurs, contact service@growatt.tech | Growatt |
Error 408 | NTC temperature too high | After shutdown, check the temperature, normally restart the inverter. If the error message still occurs, contact service@growatt.tech | Growatt |
Error 409 | Invalid bus voltage | Restart the inverter. If the error message still occurs, contact service@growatt.tech | Growatt |
Error 410 | Supply voltage of main board and control panel is inconsistent | Restart the inverter. If the error message still occurs, contact service@growatt.tech | Growatt |
Error 411 | Communication error | After switching off, check the wiring of the communication card. If the error message still occurs, contact service@growatt.tech | Growatt |
Error 412 | Temperature sensor connection is incorrect | After turning off, check that the temperature sampling module is properly connected. If the error message still occurs, contact service@growatt.tech | Growatt |
What you can check yourself, and what you cannot
As a homeowner, you can perform basic checks for some Growatt inverter errors:
- Check for obstructions: For "Temperature too high" (Error 108) or "Fan fault" (Error 109), ensure the inverter's cooling fins and fan are clear of dust, spider webs, or vegetation.
- Restart the inverter: For many temporary communication or internal errors (e.g., Error 103, 105, 110, 111, 112, 113, 304, 400, 401, 402, 404, 405, 406, 407, 409, 410), a simple restart may clear the fault. Follow your inverter's manual for the correct shutdown and startup procedure (typically DC isolator off, then AC isolator off, wait a few minutes, then AC on, then DC on).
- Check circuit breakers: For "AC connection fault" (Error 106) or "No AC connection" (Error 302), check your main switchboard and any external AC isolators to ensure they haven't tripped.
- Reduce load: For "Overload error" (Error 305), check if the output load exceeds the inverter's capacity and reduce it if necessary.
What you cannot check yourself:
You should never attempt to open the inverter casing, work on DC wiring, or perform electrical tests on the system. These tasks require an accredited solar electrician. Errors indicating safety hazards, such as:
- PV isolation low (Error 101, Error 203)
- Ground fault (Error 107)
- AFCI fault (Error 114, Error 200)
- Leakage current too high (Error 201)
- PV over voltage (Error 100, Error 202)
...are safety-critical and require immediate professional attention. Do not restart the inverter if these errors persist. Contact your installer immediately.
What the published sources do not tell you
Specific voltage and frequency trip thresholds for inverters are defined in Australian Standard AS/NZS 4777.2. This is a paid standard, and its exact numerical limits are not publicly available in the sources we checked or general documentation. Your inverter's settings are configured by your accredited installer to comply with this standard and your local network distributor's requirements.
Grid voltage behaviour can vary significantly between different electricity distribution networks across Australia. While "AC over voltage" (Error 104) is a common issue in areas with high solar penetration, the frequency and severity can differ. Your electricity bill will name your specific distributor, and they can provide information on local grid conditions. Your installer can also confirm the specific settings configured on your Growatt inverter.
Frequently asked questions
What does Growatt Error 104 mean?
Growatt Error 104 indicates an AC over voltage condition, often caused by high grid voltage during peak solar hours. The inverter will automatically restart when the grid voltage normalises. If persistent, contact your installer to assess grid conditions or adjust volt-watt settings.
What should I do if my Growatt inverter shows a ground fault?
A ground fault (Error 107 or Error 203) is a safety-critical issue indicating current leakage to earth or a potential insulation fault. Contact your installer immediately. Do not attempt to restart the inverter without professional inspection.
Why does my Growatt inverter shut down on sunny afternoons?
In Australia, Growatt inverters may shut down or reduce output on sunny afternoons due to AC over voltage (Error 104). This occurs when the grid voltage rises above permitted limits, often in areas with high solar penetration. The inverter is designed to disconnect to protect the grid, as per AS 4777.2:2020.
Can I fix Growatt inverter errors myself?
Some Growatt errors, like temporary communication issues, may resolve with a simple restart. However, safety-critical faults such as ground faults, arc faults, or PV over voltage require immediate professional attention. Never attempt to open the inverter or work on DC wiring yourself.
What is an AFCI fault on a Growatt inverter?
An AFCI fault (Error 114 or Error 200) indicates that the inverter's Arc Fault Circuit Interrupter has detected a potential arc in the DC wiring. This is a fire risk. Contact your installer immediately and do not restart the inverter without professional inspection.
References
- Growatt MOD XH BP Inverter Error Description — accessed 26 August 2026
- PSW Energy: Growatt Error Codes Resolution Guide — accessed 26 August 2026
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