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Fronius Inverter State Codes

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Fronius Inverter

State Codes

Fronius is one of the most popular inverter brands in Australia due to a long reputation for quality and reliability. However, sometimes issues can crop up in a solar system. The inverter will provide a status code but it doesn't mean much to the home owner. Below are descriptions of the most common error or status codes with potential causes and solutions.

Status Diagnosis and Troubleshooting

Displaying status codes
Your inverter is equipped with system self diagnosis that automatically identifies a large number of possible operation issues by itself and displays them on the screen. This enables you to know immediately if there are any malfunctions in the inverter or the photovoltaic system or any installation or operating errors.

Whenever the system self diagnosis has identified a particular issue, the respective status code is shown on the screen.

IMPORTANT! Status codes may sometimes appear briefly as a result of the control response from the inverter. If it subsequently continues to operate normally, there has not been a system error.

Total Failure of the Display If the display remains dark for a long time after sunrise:
    • check the AC voltage at the inverter’s connections: the AC voltage must be 208–240 V (+10% / -12%) according to the grid.

Fronius Primo State Codes

The Fronius Primo is the most popular Fronius inverter in Australia. These status codes apply to the old Primo model. Most of these apply to the new Primo Gen24 model (which has a few more codes) but since it doesn’t have a display, these will appear as service messages on Fronius Solar.web only.

Have you downloaded the relevant inverter manual yet? You may find what you need there!

Fronius Primo
Fronius Primo Gen24 

Fronius Gen24 Inverter

Class 1 status codes

Status codes in class 1 are typically temporary. Their cause lies in the grid.

Example: The grid frequency is too high and the inverter is not permitted to feed energy into the grid because this would not comply with a standard. No device fault has occurred.
The inverter will first respond by disconnecting from the grid. Then, the grid will be checked for the duration of the observation period stipulated. If, after the end of this period, no further defect is identified, your inverter resumes operating and feeding energy into the grid.

Grid conditions are being tested and as soon as they are within the permissible range again, the inverter will resume feeding energy into the grid.

If this status code keeps recurring, contact your system installer.

Grid conditions are being tested and as soon as they are within the permissible range again, the inverter will resume feeding energy into the grid.

If this status code keeps recurring, contact your system installer.

Grid conditions are being tested and as soon as they are within the permissible range again, the inverter will resume feeding energy into the grid.

If this status code keeps recurring, contact your system installer.

Grid conditions are being tested and as soon as they are within the permissible range again, the inverter will resume feeding energy into the grid.

If this status code keeps recurring, contact your system installer.

Grid conditions are being tested and as soon as they are within the permissible range again, the inverter will resume feeding energy into the grid.

If this status code keeps recurring, contact your system installer.

Grid conditions are being tested and as soon as they are within the permissible range again, the inverter will resume feeding energy into the grid.

If this status code keeps recurring, contact your system installer.

Grid conditions are being tested and as soon as they are within the permissible range again, the inverter will resume feeding energy into the grid.

If this status code keeps recurring, contact your system installer.

Class 3 status codes

Class 3 comprises status codes that may appear during feed-in operation and that do not cause a permanent interruption of the grid power feed operation.

After automatic disconnection from the grid and waiting for its conditions to return to those stipulated, your inverter will try to resume grid power feed operation.

Short interruption of grid power feed operation due to overcurrent in the inverter. The inverter returns to the startup phase.

Error is corrected automatically;

If status code persists: Contact a Fronius-trained service technician

Short interruption of grid power feed operation due to overcurrent in the inverter. The inverter returns to the startup phase.

Error is corrected automatically;

If status code persists: Contact a Fronius-trained service technician

Short interruption of power feeding into the grid due to over-temperature.
The inverter returns to the startup phase.

If required, clean cool air vents and cooling elements with compressed air.
The fault is rectified automatically;
If status code persists, contact your system installer.

Short interruption of power feeding into the grid due to over-temperature.
The inverter returns to the startup phase.

If required, clean cool air vents and cooling elements with compressed air.
The fault is rectified automatically;
If status code persists, contact your system installer.

Short interruption of grid power feed operation
The inverter returns to the startup phase.

The fault is rectified automatically;
If status code persists with sufficient sunlight, contact your system installer.

Note: appears naturally every morning and evening due to low solar irradiance. These status codes are not the result of a fault.

Short interruption of grid power feed operation
The inverter returns to the startup phase.

The fault is rectified automatically;
If status code persists with sufficient sunlight, contact your system installer.

Note: appears naturally every morning and evening due to low solar irradiance. These status codes are not the result of a fault.

Short interruption of grid power feed operation
The inverter returns to the startup phase.

Error is corrected automatically;
If status code persists: Contact a Fronius-trained service technician

Short interruption of grid power feed operation
The inverter returns to the startup phase.

Error is corrected automatically;
If status code persists: Contact a Fronius-trained service technician

Short interruption of grid power feed operation
The inverter returns to the startup phase.

Error is corrected automatically;
If status code persists: Contact a Fronius-trained service technician

Class 4 status codes

Class 4 status codes may require intervention. They are triggered by faulty hardware or a software problem. Try switching off the Fronius inverter following the system shutdown procedure, leave off for a few minutes then attempt to restart. If the fault continues please contact your local Fronius Service Partner for further assistance.

Fronius Error State 475

The inverter will automatically attempt to connect again and, if possible, resume grid power feed operation

If status code persists: Contact a Fronius-trained service technician

The inverter will automatically attempt to connect again and, if possible, resume grid power feed operation

If status code persists: Contact a Fronius-trained service technician

The inverter will automatically attempt to connect again and, if possible, resume grid power feed operation

If status code persists: Contact a Fronius-trained service technician

The inverter will automatically attempt to connect again and, if possible, resume grid power feed operation

If status code persists: Contact a Fronius-trained service technician

The “fixed voltage” setting has been selected instead of MPP voltage operation and the voltage is set to a value that is too low or too high.

If this status code keeps recurring, contact your system installer.

Inverter does not feed current into the grid.

If status code persists: Contact a Fronius-trained service technician

The inverter will automatically attempt to connect again and, if possible, resume grid power feed operation

If status code persists: Contact a Fronius-trained service technician

The inverter will automatically attempt to connect again and, if possible, resume grid power feed operation

If status code persists: Contact a Fronius-trained service technician

The inverter will automatically attempt to connect again and, if possible, resume grid power feed operation

If status code persists: Contact a Fronius-trained service technician

The inverter will automatically attempt to connect again and, if possible, resume grid power feed operation

If status code persists: Contact a Fronius-trained service technician

The inverter will automatically attempt to connect again and, if possible, resume grid power feed operation

If status code persists: Contact a Fronius-trained service technician

The inverter will automatically attempt to connect again and, if possible, resume grid power feed operation

If status code persists: Contact a Fronius-trained service technician

Inverter does not feed current into the grid.

Perform AC reset (turn automatic circuit breaker off and on); update inverter firmware;
If status code persists: Contact a Fronius-trained service technician

One or more PC boards in the inverter are not compatible with each other, e.g., after PC board replacement

The inverter will automatically attempt to connect again and, if possible, resume grid power feed operation

Update the inverter firmware;
If status code persists: Contact a Fronius-trained service technician

The inverter will automatically attempt to connect again and, if possible, resume grid power feed operation

Update the inverter firmware;
If status code persists: Contact a Fronius-trained service technician

One or more PC boards in the inverter are not compatible with each other, e.g., after PC board replacement

The inverter will automatically attempt to connect again and, if possible, resume grid power feed operation

Update the inverter firmware;
If status code persists: Contact a Fronius-trained service technician

Inverter does not feed current into the grid.

If status code persists: Contact a Fronius-trained service technician

Inverter does not feed current into the grid for safety reasons.

Update the inverter firmware;
If status code persists: Contact a Fronius-trained service technician

Inverter does not feed current into the grid for safety reasons.

If this status code keeps recurring, contact your system installer.

Inverter does not feed current into the grid for safety reasons.

If this status code keeps recurring, contact your system installer.

Inverter does not feed current into the grid for safety reasons.

If this status code keeps recurring, contact your system installer.

The inverter will automatically attempt to connect again and, if possible, resume grid power feed operation

If status code persists: Contact a Fronius-trained service technician

The inverter will automatically attempt to connect again and, if possible, resume grid power feed operation

If status code persists: Contact a Fronius-trained service technician

The inverter will automatically attempt to connect again and, if possible, resume grid power feed operation

If status code persists: Contact a Fronius-trained service technician

The inverter will automatically attempt to connect again and, if possible, resume grid power feed operation

If status code persists: Contact a Fronius-trained service technician

The inverter will automatically attempt to connect again and, if possible, resume grid power feed operation

If status code persists: Contact a Fronius-trained service technician

Inverter does not feed current into the grid.

Contact a Fronius-trained service technician

Inverter does not feed current into the grid.

Contact a Fronius-trained service technician

Inverter does not feed current into the grid.

Contact a Fronius-trained service technician

Inverter does not feed current into the grid.

Contact a Fronius-trained service technician

Inverter does not feed current into the grid.

Contact a Fronius-trained service technician

Inverter does not feed current into the grid.

Contact a Fronius-trained service technician

Inverter does not feed current into the grid.

If this status code keeps recurring, contact your system installer.

Inverter does not feed current into the grid.

If this status code keeps recurring, contact your system installer.

Inverter does not feed current into the grid.

If this status code keeps recurring, contact your system installer.

The inverter will automatically attempt to connect again and, if possible, resume grid power feed operation

If status code persists: Contact a Fronius-trained service technician

One or more PC boards in the inverter are not compatible with each other, e.g., after PC board replacement

Inverter does not feed current into the grid.

Contact a Fronius-trained service technician

Inverter does not feed current into the grid.

Perform an AC reset (switch the automatic circuit breaker off and on), complete commissioning

Inverter does not feed current into the grid.

Check MPP settings;
If status code persists: Contact a Fronius-trained service technician

Inverter does not feed current into the grid.

Check MPP settings;
If status code persists: Contact a Fronius-trained service technician

status code 479 appears 5x one after the other

Inverter does not feed current into the grid.

If status code persists: Contact a Fronius-trained service technician

Class 5 status codes

Class 5 status codes generally do not impair grid power feed operation, but can lead to limitations. They will be displayed until the status code is acknowledged by pressing a key (the inverter, however, continues working normally in the background).

Fronius State 567

Warning message is shown on the display

If this status code keeps recurring, contact your system installer.

Warning message is shown on the display

Acknowledge status code;
Check whether all conditions for problem-free grid power feed operation are met (e.g., whether solar modules are covered with snow).
If status code persists: observe further status codes

Warning message is shown on the display

If status code persists: Contact a Fronius-trained service technician

Warning message of memory unit

If status code persists: Contact a Fronius-trained service technician

A warning message is shown on the display when a power derating occurs

If required, clean cool air vents and cooling elements with compressed air.
The fault is rectified automatically;
If status code persists, contact your system installer.

Warning message on the display

If this status code keeps recurring, contact your system installer.

Warning message on the display

If this status code keeps recurring, contact your system installer.

One or more PC boards in the inverter are not compatible with each other, e.g., after PC board replacement

Possible error displays or malfunctions in the inverter

If this status code keeps recurring, contact your system installer.

The status code is displayed when the mains frequency is excessive.
The inverter reduces the power in this case.
The status indicator is shown until the inverter is back in normal operation.

As soon as the mains frequency is back within the permissible range and the inverter is back in normal operation, the error is automatically corrected
If status code persists, contact your system installer.

e.g. in the event of external arc monitoring

This status code is displayed every day until the Arc Detector is reactivated.

No error!
Confirm the status code by pressing the “Enter” key

The status code is displayed when the mains voltage is excessive.
The inverter reduces the power in this case.
The status indicator is shown until the inverter is back in normal operation.

This mode must be enabled by default in accordance with Australian Standards.

Acknowledge status code; if this status code keeps recurring, contact your system installer.

Class 7 status codes

Class 7 status codes concern the inverter control unit, configuration and data recording, and can directly or indirectly affect grid power feed operation.

e.g., number assigned twice

Correct inverter number in the setup menu

Warning message is shown on the display

Acknowledge status code;
If status code persists: Contact a Fronius-trained service technician

Warning message is shown on the display

Check or replace the USB thumb drive
Check the USB thumb drive file system
If status code persists: Contact a Fronius-trained service technician

Warning message is shown on the display

Check or replace the USB thumb drive
Check the USB thumb drive file system
If status code persists: Contact a Fronius-trained service technician

Warning message is shown on the display

Insert or check the USB thumb drive.
If status code persists: Contact a Fronius-trained service technician

Warning message is shown on the display

Check the update file (e.g., for the proper file name).
If status code persists: Contact a Fronius-trained service technician

Warning message is shown on the display

Check the update file.
If necessary, download the correct update file for the device (e.g., at
http://www.fronius.com).
If status code persists: Contact a Fronius-trained service technician

Warning message is shown on the display

Check the USB thumb drive and the files on the USB thumb drive or replace the USB thumb drive.
Remove the USB thumb drive only when the “Data Transfer” LED is no longer flashing or lit.
If status code persists: Contact a Fronius-trained service technician

Warning message is shown on the display

Free up memory. Remove write-protection. If necessary, check or replace the USB thumb drive.
If status code persists: Contact a Fronius-trained service technician

Warning message is shown on the display

Repeat the update process. Check the USB thumb drive.
If status code persists: Contact a Fronius-trained service technician

Warning message is shown on the display, update process is cancelled

Download the update file again.
If status code persists: Contact a Fronius-trained service technician

Warning message is shown on the display

Reset the time and date on the inverter
If status code persists: Contact a Fronius-trained service technician

Warning message is shown on the display

Reset the time and date on the inverter
If status code persists: Contact a Fronius-trained service technician

Error message is shown on the display, the inverter does not feed current into the grid

If status code persists: Contact a Fronius-trained service technician

Inaccurate time, time loss possible (grid power feed operation normal)

If status code persists: Contact a Fronius-trained service technician

Error message is shown on the display

If status code persists: Contact a Fronius-trained service technician

We hope the above table has provided a little more clarity about the Fronius State code you were looking for. If you still don’t know what it means, you should contact your system installer for further assistance.

If you think there is a problem with your system and they are not helping you, leave your details below with a description of the problem and we will try to help. If you are in our service region, we may be able to call out and repair or get your system going again.

Fronius Inverter Repair and Servicing
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