Fronius Inverter Error (Fault) STATE Codes

Fronius is a renowned manufacturer of solar inverters, and their products are extensively utilized across Australia. Fronius inverters come equipped with a detailed system of error codes, known as STATE codes, which help identify specific issues or conditions that may occur during the inverter’s operation.

Each STATE code corresponds to a particular condition or fault, and the steps to troubleshoot these issues can differ based on the code and the inverter model. If you come across an error code on your Fronius inverter, it’s advisable to refer to the inverter’s user manual or seek assistance from a certified solar technician to accurately diagnose and address the problem.

In most cases, your Fronius inverter will display error messages to help you understand the issue. Below is a complete list of all the error codes associated with Fronius IG inverters.

Fronius Fault codes Starting with 1xx

Code

Description

Possible causes

Sequence

STATE 101Grid voltage has exceeded the allowable range.
  1. Grid voltage issue detected.
  2. Invalid or incorrect settings found in the service menu.
  3. An internal malfunction has occurred.
  1. Verify the grid voltage and ensure the circuit breakers are switched ON.
  2. Adjust the parameters in the service menu if necessary.
  3. If the problem remains unresolved, contact your Fronius Service Partner for further assistance.
STATE 104The grid frequency has gone outside the allowed range.
  1. Grid frequency issue detected.
  2. Invalid or inaccurate settings in the service menu.
  3. An internal system fault has been identified.
  1. Verify the grid frequency and ensure the circuit breakers are turned ON.
  2. Adjust the settings in the service menu as needed.
  3. If the issue continues, reach out to your Fronius Service Partner for assistance.
STATE 107Unable to synchronize with the public grid supply.
  1. The grid connection is not established.
  2. Invalid or improper settings detected in the service menu.
  3. An internal system malfunction has occurred.
  1. Ensure the grid power is connected and verify that the circuit breakers are switched ON.
  2. Review and confirm the settings in the service menu.
  3. If the issue remains unresolved, contact your Fronius Service Partner for further support.
STATE 108Islanding condition has been identified
  1. Islanding condition has been identified.
  2. Significant irregularities detected in the grid supply.
  3. An internal system fault has been detected.
  1. Automatic correction is in progress.
  2. Automatic correction is being attempted.
  3. If the issue continues, reach out to your Fronius Service Partner for assistance.

Fronius Error Codes Starting with 2xx

CodeDescriptionPossible causesSequence
STATE 201The grid voltage exceeds the permitted range.
    1. Error in grid voltage from the public mains.
    2. Internal malfunction.
      1. Verify the grid voltage.
      2. If the issue continues, reach out to your Fronius Service Partner.
      STATE 202Power supply voltage has dropped below the minimum threshold
      STATE 203The grid voltage exceeds the permitted range.
      1. Grid frequency error on the public mains.
      2. Internal malfunction.
      1. Verify the grid voltage.
      2. If the issue continues, reach out to your Fronius Service Partner.
      STATE 204Power supply voltage has dropped below the minimum threshold
      STATE 205 Network power supply impedance has shifted
      1. Significant disturbances on the public mains.
      2. Internal malfunction.
      1. Strengthen the mains cables.
      2. Connect the Fronius IG inverter to a different phase.
      3. If the issue persists, contact your Fronius Service Partner.
      STATE 206The impedance measurement exceeds the permitted maximum level
      1. Mains impedance is excessively high.
      2. Internal malfunction.
      STATE 207The relay remains closed despite receiving the shutdown command
      1. Internal malfunction.
      If the issue continues, please reach out to your Fronius Service Partner.
      STATE 208The relay fails to engage despite the activation signal

      Fronius Error Codes Starting with 3xx

      CodeDescriptionPossible causesSequence
      STATE 301The safety circuit identifies a current surge and signals it on the mains supply.
      1. Voltage drop in the public mains.
      2. Internal malfunctions.
      1. Automatic correction and maintenance.
      2. If the issue continues, you may reach out to your Fronius Service Partner.
      STATE 302Grid voltage is below the specified limit.
      1. Voltage drop in the public mains.
      2. Internal malfunctions.
      1. Automatic correction and maintenance.
      2. If the issue continues, you may contact your Fronius Service Partner for assistance.
      STATE 303The temperature of the heat sink indicates too high on the DC-AC board
        1. The ventilation slot is excessively full.
        2. The atmospheric temperature is extremely high.
        3. The distance between inverters is too short.
        4. Internal malfunction.
        1. Clear the ventilation slot to create space.
        2. Relocate the inverter.
        3. Increase the distance between inverters.
        4. If the issue persists, contact your Fronius Service Partner.
        STATE 304The temperature of the heat sink indicates too high on the DC-AC board
        STATE 305The feed-in process cannot proceed, despite the public mains parameters being within acceptable limits.Internal issues.If the issue continues, please contact your Fronius Service Partner for assistance.
        STATE 306POWER LOWThe intermediate circuit voltage has fallen below the prescribed threshold value for feed-in.
        1. Verify the panels are functioning properly.
        2. Internal issues.
        STATE 307DC LOW
        1. The DC input voltage is too low for feed-in.
        2. Internal malfunction.
        STATE 308The Intermediate circuit voltage is out of the maximum limit
        1. The public mains are experiencing disturbances.
        2. There is an internal fault.
        1. Reinforce the mains cable and check.
        2. If the problem persists, contact your Fronius Service Partner.

        Fronius Fault codes Starting with 4xx

        CodeDescriptionPossible causesSequence
        STATE 401Communication issues between the IG control and the DC-DC board.

         Internal issues and errors.

        If the issue continues, please reach out to your Fronius Service Partner for assistance.

        STATE 402Access to the internal memory of the Fronius IG inverter has failed.

         

         

        STATE 403The section of internal memory for the country setting is incomplete.

         

         

        STATE 404The connection between the control unit and the ENS is faulty.
        1. The public mains are not connected properly.
        2. There is an internal fault.
        1. Verify the connection of the public mains.
        2. If the issue continues to persist, please contact your Fronius Service Partner.
        STATE 405An outdated or incorrect version of the ENS microprocessors has been detected.Internal issues and errors.If the issue continues, please reach out to your Fronius Service Partner for assistance.
        STATE 406The temperature sensor is not connected properly, and there is a fault in the DC-AC board.
        STATE 407The temperature sensor on the DC-DC board is either faulty or not properly connected.
        STATE 408 Public mains appear to be out of sync or have detected faults.
        STATE 409 
        STATE 410 
        STATE 411 
        STATE 412 
        STATE 413 
        STATE 414 
        STATE 415 
        STATE 416 
        STATE 417 
        STATE 418 
        STATE 419 
        STATE 420 
        STATE 421 
        STATE 422 
        STATE 423 
        STATE 424 
        STATE 425 
        STATE 426 
        STATE 427 
        STATE 428 
        STATE 429 
        STATE 430 
        STATE 431 
        STATE 432 
        STATE 433 
        STATE 434 
        STATE 435 
        STATE 436 
        STATE 437 
        STATE 438 
        STATE 439 
        STATE 440 
        STATE 441 
        STATE 442 
        STATE 443 
        STATE 444 
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