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The 2025 Guide To Troubleshooting Fronius Solar Inverter Error Codes
In this guide we provide assistance on troubleshooting and diagnosing Fronius Solar Inverter Error codes to help you fix the problem.
Find your inverter error code(s) listed below and click through to find relevant information, error messages, possible causes and how to go about remedying the problem.
If you find that we don't have your listed error code then please let us know and we will add it as soon as possible.
For us to assist you please have the following information when calling us.
- Fronius fault codes displayed
- Inverter model
- Serial number of your inverter
- Purchase date for us to establish the warranty expiry date
Then call us on 1300 639 363
One of our Fronius Service specialists will try to establish if the fault is repairable without a site visit.
If a site visit is necessary for further fault diagnosis then we can book you in and have a technician come to your premises to investigate what is causing the fault on your Fronius inverter. Many times our trained Fronius technicians will be able to resolve the problem straight away. However, sometimes it is necessary to exchange the parts or the whole Fronius inverter depending on the fault. We will explain what has gone wrong on the Fronius inverter and discuss your available options before any further costs are billed.
We list a few Fronius error codes underneath to assist you to self-diagnose the problem with your Fronius Inverter.
IMPORTANT NOTE
It's always better to have problems with your Fronius Inverter investigated, repaired or replaced by a qualified and an authorised Fronius Support Partner such as Essential Energy Solutions.
If the problem persists, you should contact us on 1300 639 363 to investigate the issue.
Fronius Inverter Error Codes
To find your particular Fronius inverter fault codes with ease, record the error number or numbers that are displayed on your Fronius Solar Inverter, then look them up on this page and click the toggle.
Fronius Inverter Error Code Range 100 - 199
An Error Code 101 on a Fronius inverter means that the grid voltage is not within the permited limits.
This could be caused by the Mains voltage, an internal fault with the Fronius inverter or incorrect service menu values.
We are usually able to fix this problem straight away.
Description: The AC voltage is too high.
What to do: Contact your original solar installer or us on 1300 639 363 to investigate and repair the issue.
Description: The AC voltage is too low.
What to do: Contact your original solar installer or us on 1300 639 363 to investigate and repair the issue.
An Error Code 104 on a Fronius inverter means that the Mains frequency is not within the permitted limits of the Fronius inverter.
This could be caused by the Mains voltage, an internal fault with the Fronius inverter or incorrect service menu values.
Description: The AC frequency is too high.
What to do: Contact your original solar installer or us on 1300 639 363 to investigate and repair the issue.
Description: The AC frequency is too low.
What to do: Contact your original solar installer or us on 1300 639 363 to investigate and repair the issue.
Description: The AC is outside the allowed threshholds.
What to do: Contact your original solar installer or us on 1300 639 363 to investigate and repair the issue.
Description: Independant operation detected.
What to do: Contact your original solar installer or us on 1300 639 363 to investigate and repair the issue.
Description: A residual current monitoring unit (RCMU) error has occurred.
What to do: Contact your original solar installer or us on 1300 639 363 to investigate and repair the issue.
Description: Grid frequency increased above threshold.
What to do: Contact your original solar installer or us on 1300 639 363 to investigate and repair the issue. This value can be adjusted to the grid's frequency via menupoint RoCoF (Rate of Change of Frequency) in the Profile Menu.
Fronius Inverter Error Code Range 300 - 399
An Error Code 303 on a Fronius inverter means that the temperature on the DC to AC board is higher than it should be.
Check to see if the ventilation slots are blocked up because this will prevent cool air entering the inverter to help cool it down. Under the extreme Queensland temperatures the ambient temperature surrounding the inverter could also be so high that the inverter struggles to cool itself.
An Error Code 307 on a Fronius inverter means that the DC current on the input is too low for the inverter.
This could well indicate that there is an internal fault with the inverter that needs specialist repair.
An Error Code 314 on a Fronius inverter usually fixes itself when the inverter is restarted.
First perform a restart on your Fronius Inverter to see if the error code goes away. If it remains that means that there is a current sensor calibration timeout or there is an internal system error.
Reads error
Hi L Sossi, please contact us on 1300 639 363, so that we can assist you further.
my fronius 5 kw three phase inverter shows error code 307 please guide us solutions for the error