Fronius Primo Inverter Status Error Codes

Fronius Primo Inverter State Error Codes

If your solar system uses a Fronius inverter and it develops a fault, contact AC Gold and we’ll get your solar PV system back up and generating electricity.

If your Fronius inverter is still under warranty, the cost of repairing or replacing it will be covered by Fronius.

Download Fronius Primo Solar Inverter Manual.

When a Fronius inverter develops a fault, it usually displays a status code to explain what is wrong. The following table lists the Fronius Primo series inverter status codes so you can learn what your Fronius Primo inverter is telling you and how to fix it.

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Class 1 Fronius 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.

The GPIS soft start function is activated depending on the country setup: according to national guidelines, the output of the inverter increases continuously after a shutdown due to an AC error.


Error Code Description Behaviour Solution
102 AC Voltage too high

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

Check grid connections. If this status code keeps recurring, contact your system installer
103 AC voltage too low
105 AC frequency too high
106 AC frequency too low
107 No AC grid detected
108 Stand alone operation detected
112 RCMU error

Class 2 Fronius status codes:

Error Code Description Details Solution
212 Overvoltage at L1-N Grid conditions are being tested and as soon as the are back within the permissible range, the inverter will resume grid power feed operation. Check grid connections. If this status code keeps recurring, contact your system installer.
213 Undervoltage at L1-N
222 Overvoltage at L2-N
223 Undervoltage at L2-N
240 Arc detected The status code is displayed for approx. 4 seconds.
241 Arc detected The status code 241 is displayed directly after 240; the inverter disconnects from the grid for safety reasons. If an arc has been detected, check the entire affected PV system for damage before resetting the inverter. Reset status code by pressing the "Enter" key.
242 Arc detected Status code 242 is displayed after resetting status code 241. Reset the status code by pressing the “Enter” key. The inverter resumes grid power feed operation. If the status code keeps recurring, contact your system installer.
245 Arc detector self test failed The inverter disconnects from the grid. Reset AC. The test is repeated. If the status code persists: contact a Fronius-trained service technician.
247 Arc detector current sensor defective The inverter disconnects from the grid. If status code persists: contact a Fronius-trained service technician.
249 Arc detector defective

Class 3 Fronius status codes:

Class 3 includes status codes that may appear during grid power feed operation and do not cause 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.

Error Code Description Details Rectification
301 Over-current (AC) Brief interruption of grid power feed operation due to overcurrent in the inverter. The inverter returns to the startup phase. Error is automatically rectified; if status code persists: contact a Fronius-trained service technician.
302 Over-current (DC)
303 Power stage set over temperature Brief interruption of grid power feed operation 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 this status code keeps recurring, contact your system installer.
304 Interior temperature too high
306 LOW PV POWER
Intermediate circuit voltage has dropped below permissible threshold value for grid power feed operation.
Brief interruption of grid power feed operation. The inverter returns to the Startup phase. The fault is rectified automatically. If this status code keeps recurring with sufficient solar irradiance, contact your system installer.
307 LOW PV VOLTAGE
DC input voltage has dropped below permissible threshold value for grid power feed operation.
IMPORTANT! Status codes 306 (LOW PV POWER) and 307 (LOW PV VOLTAGE) appear naturally every morning and evening due to low solar irradiance. These status codes are not the result of a fault.
308 Intermediate circuit overvoltage Brief interruption of grid power feed operation. The inverter returns to the Startup phase. Error is automatically rectified; if status code persists: contact a Fronius-trained service technician
309 DC input voltage for MPPT 1 too high
313 DC input voltage for MPPT 2 too high

Class 4 Fronius status codes:

Error Code Description Details Rectification
401 Unable to communicate with the power stage set 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.
406 Power stage set temperature sensor defective
407 Internal temperature sensor defective
408 Direct current feeding in detected
412 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.
415 Safety cut-out has been triggered by option card or RECERBO Inverter does not feed energy into the grid.  
416 No communication between power stage set and control unit 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.
417 ID problem with hardware
419 Unique ID conflict
421 HID range error
425 Unable to communicate with the power stage set
426 – 428 Possible hardware defect
431 Software problem Inverter does not feed energy into the grid. Perform AC reset (switch automatic circuit breaker off and on again); update inverter firmware; If status code persists: contact a Fronius-trained service tech-
nician.
436 Function incompatibility (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 feeding energy into the grid Update inverter firmware; If status code persists: contact a Fronius-trained service technician.
437 Power module problem
438 Function incompatibility (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 feeding energy into the grid Update inverter firmware; If status code persists: contact a Fronius-trained service technician.
443 Intermediate circuit voltage too low or unsymmetrical Inverter does not feed energy into the grid. If status code persists: contact a Fronius-trained service technician.
445 Impermissible limit value settings Inverter does not feed energy into the grid for safety reasons. Update the inverter firmware. If status code persists: contact a Fronius-trained service technician.
447 Insulation fault If this status code keeps recurring, contact your system installer.
448 Neutral conductor not connected
450 No guard found
451 Memory error detected 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.
452 Communication problem between processors
453 Brief grid voltage error
454 Brief grid frequency error
456 Anti-islanding function has stopped running properly
457 Grid relay stuck Inverter does not feed energy into the grid. If status code persists: contact a Fronius-trained service technician.
459 Error receiving measuring signal for the insulation test
460 Reference power source for the digital signal processor (DSP) is operating outside of tolerances
461 Error in DSP data memory
462 Error in DC feed-in monitoring routine
463 AC polarity reversed, AC connector plugged in incorrectly
474 RCMU sensor faulty Inverter does not feed energy into the grid. If this status code keeps recurring, contact your system installer.
475 Solar module ground, insulation error (connection between solar module and ground)
476 Supply voltage for driver too low
479 Intermediate circuit voltage relay is switched off The inverter will automatically attempt to connect again and, if possible, will resume feeding energy into the grid. If status code persists: contact a Fronius-trained service technician.
480, 481 Function incompatibility (one or more PC boards in the inverter are not compatible with each other, e.g.,after PC board replacement) Inverter does not feed energy into the grid. Update inverter firmware; If status code persists: contact a Fronius-trained service technician.
482 Commissioning is not complete Inverter does not feed energy into the grid. Reset AC (switch automatic circuit breaker on and off), carry out full commissioning.
483 Voltage UDCfix for MPP2 string is outside of valid range Inverter does not feed energy into the grid. Check MPP settings; If status code persists: contact a Fronius-trained service technician.
485 CAN transmission buffer is full Inverter does not feed energy into the grid. Perform AC reset (switch automatic circuit breaker off and on again);
If status code persists: contact a Fronius-trained service technician.
489 Permanent overvoltage on intermediate circuit capacitor (five 479 status codes in a row) The inverter is not feeding any energy into the grid. If status code persists: contact a Fronius-trained service technician.

Class 5 Fronius status codes:

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

Error Code Description Details Rectification
502 Insulation error on the solar modules Warning message is shown on the display. If this status code keeps recurring, contact your system installer.
509 No feed-in within the last 24 hours Warning message is shown on the display.

Acknowledge status code; check if all conditions for fault free grid power feed operation are fulfilled (e.g., if the solar modules are covered with snow).

If the status code persists: observe further status codes.

515 No internal communication with filter Warning message on the display If status code persists: Contact a Fronius-trained service technician
516 Communication with memory unit not possible Warning message of memory unit
517 Power derating due to excessive temperature If a power derating occurs, a warning message is shown on the display.

If required, clean cool air vents and cooling elements with compressed air.

The fault is rectified automatically.

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

522 DC low String 1 Warning message on the display If this status code keeps recurring, contact your system installer.
523 DC low String 2
558 Function incompatibility (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.
560 Power derating due to over-frequency

The status code is displayed with excessive grid frequency. The inverter reduces the power.

The status indicator is displayed until the inverter resumes normal operation.

As soon as the grid frequency returns to the permissible range and the inverter re-
sumes normal operation, the error is rectified automatically.

If the status code persists, contact your system installer.

566 Arc detector switched off (e.g., with external arc monitoring) The status code is displayed every day until the arc detector is activated again. No error! Confirm status code displayed by pressing the "Enter" key.

Class 7 Fronius status codes:

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

Error Code Description Details Rectification
705 Conflict between inverter numbers (e.g., number is assigned twice) Correct inverter number in Setup menu
721 EEPROM was reinitialized or EEPROM is defective Warning message is shown on the display. Acknowledge status code. If status code persists: contact a Fronius-trained service technician.
731 Initialization error – USB stick is not supported Warning message is shown on the display.

Check or replace the USB stick.

Check the USB stick file system.

If status code persists: contact a Fronius-trained service technician.

732 Overcurrent on the USB stick
733 No USB stick inserted Warning message is shown on the display. Insert or check the USB stick.
If status code persists: contact a Fronius-trained service technician.
734 Update file is not detected or is not available 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.
735 Update file does not correspond to the device, update file is too old Warning message is shown on the display; update process is cancelled.

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.

736 Write or read error occurred Warning message is shown on the display.

Check the USB stick and the files on the USB stick or replace the USB stick.

Remove the USB stick only when the "Data Transfer" LED is no longer flashing or lit.

If status code persists: contact a Fronius-trained service technician.

738 Log file could not be saved (e.g., USB stick is write-protected or full) Warning message is shown on the display.

Free up memory. Remove write-protection. If necessary, check or replace the USB stick.

If status code persists: contact a Fronius-trained service technician.

743 Error occurred during the update Warning message is shown on the display.

Repeat the update process.

Check the USB stick.

If status code persists: contact a Fronius-trained service technician.

745 Update file is faulty 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.

751 Incorrect time Warning message is shown on the display.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.

752 Communication error in the Real Time Clock module
757 Hardware error in the Real Time Clock module Error message is shown on the display; the inverter does not feed energy into the grid. If status code persists: contact a Fronius-trained service technician.
758 Internal error: Real Time Clock module is in emergency mode Incorrect timing; time may be set incorrectly (normal grid power feed operation).
766 Emergency power limiter has been activated (max. 750 W) Error message is shown on the display.

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