Fronius Symo – Fronius Eco Inverter Status Error Codes

Fronius Symo 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 Symo 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 Galvo series inverter status codes so you can learn what your Fronius Galvo inverter is telling you and how to fix it.

Looking for another Fronius Inverter Error Code? Fronius Galvo error code | Fronius ECO error code | Fronius Fronius Primo error code | Fronius SYMO error code | Fronius IG error code

Class 1 Fronius status codes:

Class 1 status codes generally only arise momentarily and are caused by the public grid.

Example: The grid frequency is too high and the inverter may not feed any energy into the grid owing to a standard. There is nothing wrong with the device. The initial response of the inverter is to disconnect itself from the grid. The grid is subsequently checked during the stipulated monitoring period. If no further problem has been detected by the end of this period, then the inverter will resume feeding energy into the grid.

The GPIS SoftStart function is activated according to the country setup: After cutting out due to an AC error, the output power of the inverter is continuously increased in line with the national guidelines.


Error Code Description Behaviour Solution
102 AC voltage too high Following careful testing and when the grid conditions are within the permissible range again, the inverter will resume feeding energy into the grid. Check grid connections; if this status code keeps recurring, contact your system engineer
103 AC voltage too low
105 AC frequency too high
106 AC frequency too low
107 No AC grid
108 Stand-alone operation detected
112 RCMU error

Class 3 Fronius status codes:

Class 3 includes status codes that may occur while feeding energy into the grid, but generally do not cause the process to be interrupted for any length of time.

The inverter disconnects automatically from the grid, the grid is then monitored as specified and the inverter attempts to resume feeding energy into the grid.

Error Code Description Behaviour Solution
301 Overcurrent (AC) Short-term interruption while feeding energy into the grid. The inverter resumes its startup routine. *)
302 Overcurrent (DC)
303 AC module overtemperature Short-term interruption while feeding energy into the grid. The inverter resumes with its startup routine. Purge cooling air openings and heat sink; **)
304 AC module overtemperature
305 No power being fed in, despite closed relay Short-term interruption while feeding energy into the grid. The inverter resumes with its startup routine. **)
306 PV output too low for feeding energy into the grid Short-term interruption while feeding energy into the grid. The inverter resumes its startup routine. wait for sufficient level of insolation; **)
307 DC low. DC input voltage too low for feeding energy into the grid
IMPORTANT! Due to the low level of insolation early in the morning and in the evening, the status codes 306 (Power low) and 307 (DC low) are displayed routinely at these times of day. These status codes do not indicate any kind of fault.
308 Intermediate circuit voltage too high Short-term interruption while feeding energy into the grid. The inverter resumes its startup routine. **)
309 DC input voltage MPPT 1 too high
311 Polarity of DC strings reversed
313 DC input voltage MPPT2 too high
314 Current sensor calibration timeout Short-term interruption while feeding energy into the grid. The inverter resumes with its startup routine. *)
315 AC current sensor error
316 InterruptCheck fail
325 Overtemperature in the connection area
326 Fan 1 error
327 Fan 2 error

*) If the status code is displayed all the time: notify a Fronius-trained service engineer
**) Fault is rectified automatically. If this status code keeps recurring, contact your system engineer


Class 4 Fronius status codes:

Some of the class 4 status codes necessitate intervention by a Fronius-trained service engineer.

Error Code Description Behaviour Solution
401 Unable to communicate with the power stage set The inverter will automatically attempt to connect again and, if possible, will
resume feeding energy into the grid
*)
406 AC module temperature sensor faulty (L1)
407 AC module temperature sensor faulty (L2)
408 DC component measured in the grid too high
412 Fixed voltage mode has been selected instead of MPP voltage mode, and the fixed voltage has been set to too low or too high a value. **)
415 Safety cut-out via option card or RECERBO has triggered The inverter is not feeding any energy into the grid. *)
416 No communication possible between power stage set and control system. The inverter will automatically attempt to connect again and, if possible, will
resume feeding energy into the grid
*)
417 Hardware ID problem The inverter will automatically attempt to connect again and, if possible, will
resume feeding energy into the grid
Update inverter firmware; *)
419 Unique ID conflict
420 No communication possible with the Fronius Datamanager
421 HID range error
425 Unable to communicate with the power stage set
426 – 428 Possible hardware fault
431 Software problem The inverter is not feeding any energy into the grid. Perform AC reset (switch automatic circuit breaker off and on again); update inverter firmware; *)
436 Functional incompatibility (one or more PC boards in the inverter are not compatible with each other, e.g. after a PC board has been replaced) The inverter will automatically attempt to connect again and, if possible, will
resume feeding energy into the grid
Update inverter firmware; *)
437 Power stage set problem
438 Functional incompatibility (one or more PC boards in the inverter are not compatible with each other, e.g. after a PC board has been replaced) The inverter will automatically attempt to connect again and, if possible, will
resume feeding energy into the grid
Update inverter firmware; *)
443 Intermediate circuit voltage too low or asymmetric The inverter is not feeding any energy into the grid. *)
445

– Compatibility error (e.g. due to replacement of a PC board)

– Invalid power stage set configuration

The inverter is not feeding any energy into the grid. Update inverter firmware; *)
447 Insulation fault The inverter is not feeding any energy into the grid. *)
448 Neutral conductor not connected
450 Guard cannot be found
451 Memory error detected The inverter will automatically attempt to connect again and, if possible, will
resume feeding energy into the grid
*)
452 Communication error between the processors
453 Grid voltage and power stage set are incompatible
454 Grid frequency and power stage set are incompatible
456 Anti-islanding function is no longer being implemented correctly
457 Grid relay is sticking or the neutral conductor ground voltage is too high The inverter is not feeding any energy into the grid. Check the grounding (the neutral conductor ground voltage must be less than 30 V); *)
458 Error when recording measuring signal The inverter is not feeding any energy into the grid. *)
459 Error when recording the measuring signal for the insulation test
460 Reference voltage source for the digital signal processor (DSP) is working out of
tolerance
461 DSP data memory error
462 Error during DC feed monitoring routine
463 Reversed AC polarity, AC connector inerted incorrectly
474 RCMU sensor faulty The inverter is not feeding any energy into the grid. **)
475 Insulation fault (connection between solar module and ground)
476 Driver supply voltage 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
*)
480, 481 Functional incompatibility (one or more PC boards in the inverter are not compatible with each other, e.g. after a PC board has been replaced) The inverter is not feeding any energy into the grid. Update inverter firmware; *)
482 Setup interrupted after initial start-up The inverter is not feeding any energy into the grid. Restart Setup after an AC reset (switch automatic circuit breaker off and on again)
483 Voltage U<sub>DC fixed</sub> on MPP2 string out of limits The inverter is not feeding any energy into the grid. Check MPP settings; *)
485 CAN transmit buffer is full
The inverter is not feeding any energy into the grid. Perform AC reset (switch automatic circuit breaker off and on again); *)
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 the status code is displayed all the time: Notify a Fronius-trained service technician
**) If this status code keeps recurring, contact your system engineer.


Class 5 Fronius status codes:

Class 5 status codes do not generally interfere with feeding energy into the grid, but can cause restrictions. A status code is displayed until it is acknowledged by pressing a key (the inverter, however, continues to operate normally in the background).

Error Code Description Behaviour Solution
502 Insulation error on the solar modules Warning message is shown on the display **)
509 No energy fed into the grid in the past 24 hours Warning message is shown on the display Acknowledge status code; check whether all the conditions for the problem-free feeding of energy into the grid have been met (e.g. are the solar modules covered with snow?); **)
515 Unable to communicate with filter Warning message on the display *)
516 No communication possible with the storage unit Storage unit warning message *)
517 Power derating caused by too high a temperature When power derating occurs, a warning message is shown on the display. If necessary, purge cooling air openings and heat sink; fault is rectified automatically; **)
518 Internal DSP malfunction Warning message on the display *)
519 No communication possible with the storage unit Storage unit warning message *)
520 No energy fed into the grid by MPPT1 in the past 24 hours Warning message is shown on the display Acknowledge status code; check whether all the conditions for the problem-free feeding of energy into the grid have been met (e.g. are the solar modules covered with snow?); *)
522 DC low String 1 Warning message on the display *)
523 DC low String 2
558, 559 Functional incompatibility (one or more PC boards in the inverter are not compatible with each other, e.g. after a PC board has been replaced) Warning message on the display Update inverter firmware; *)
560 Power derating caused by overfrequency Displayed when grid frequency becomes excessively high. The power is reduced. As soon as the grid frequency is back within the permissible range and the inverter has returned to normal operation, the fault is rectified automatically; **)
564 Functional incompatibility (one or more PC boards in the inverter are not compatible with each other, e.g. after a PC board has been replaced) Warning message on the display Update inverter firmware; *)
566 Arc detector switched off (e.g. during external arc monitoring) The status code is displayed every day until the arc detector is reactivated. No error. Confirm status code by pressing ‘Enter’
568 Incorrect input signal on the multifunction current interface The status code is displayed in the case of an incorrect input signal on the multifunction current interface and with the following setting: Basic menu / Input signal / Mode of operation = Ext. Signal, triggering method = Warning Acknowledge status code; check the devices connected to the multifunction current interface; **)
572 Power limited by the power stage set Power is being limited by the power stage set *)
573 Undertemperature warning Warning message on the display *)
581 "Special Purpose Utility-Interactive" (SPUI) setup activated The inverter is no longer compliant with the IEEE1547 and IEEE1574.1 standards because the standalone function has been deactivated, a frequency-dependent power
reduction has been activated and the frequency and voltage limits are being changed
No error. Confirm status code by pressing ‘Enter’

*) If the status code is displayed all the time: Notify a Fronius-trained service technician.
**) If this status code keeps recurring, contact your system engineer.


Class 6 Fronius status codes:

Some of the class 6 status codes necessitate intervention by a Fronius-trained service engineer.

Error Code Description Behaviour Remedy
601 CAN bus is full The inverter is not feeding any energy into the grid. Update inverter firmware; *)
603 AC module temperature sensor faulty (L3) The inverter will automatically attempt to connect again and, if possible, will resume feeding energy into the grid *)
604 DC module temperature sensor faulty
607 RCMU error The inverter is not feeding any energy into the grid. Reset status code by pressing ‘Enter’. The inverter resumes the feeding of energy into the grid; if the status code keeps appearing, check the complete photovoltaic system for damage; **)
608 Functional incompatibility (one or more PC boards in the inverter are not compatible with each other, e.g. after a PC board has been replaced) The inverter is not feeding any energy into the grid. Update inverter firmware; *)

*) If the status code is displayed all the time: notify a Fronius-trained service engineer
**) Fault is rectified automatically. If this status code keeps recurring, contact your system engineer


Class 7 Fronius status codes:

Class 7 status codes relate to the control system, the configuration and inverter data recording, and may directly or indirectly affect the process of feeding energy into the grid.

Error Code Description Behaviour Remedy
701 – 704 Provides information about the internal processor status Warning message on the display *)
705 Conflict when setting the inverter number (e.g. number already assigned) Correct inverter number in Setup menu
706 – 716 Provides information about the internal processor status Warning message on the display *)
721 EEPROM has been re-initialised Warning message on the display Acknowledge status code; *)
722 – 730 Provides information about the internal processor status Warning message on the display *)
731 Initialisation error – USB flash drive is not supported Warning message on the display Check or replace USB flash drive. Check file system on USB flash drive; *)
732 Initialisation error – Overcurrent on USB flash drive
733 No USB flash drive connected Warning message on the display Connect or check USB flash drive; *)
734 Update file not recognised or not present Warning message on the display Check update file (e.g. for correct file name) *)
735 Update file does not match the device, update file too old Warning message on the display, update process is interrupted Check update file and if necessary download an update file to match the device (e.g.
at http://www.fronius.com); *)
736 Write or read error occurred Warning message on the display Check USB flash drive and the data contained on it or replace USB flash drive. Never unplug a USB flash drive if the ‘data transfer’ LED is still flashing or lit; *)
737 File could not be opened Warning message on the display Remove and then reinsert USB flash drive; check or replace USB flash drive
738 Log file cannot be saved (e.g. USB flash drive is write-protected or full) Warning message on the display Create some storage space, remove write protection, if necessary check or replace USB flash drive; *)
740 Initialisation error – error in file system on USB flash drive Warning message on the display Check USB flash drive; reformat on PC for FAT12, FAT16 or FAT32
741 Error during recording of logging data Warning message on the display Remove and then reinsert USB flash drive; check or replace USB flash drive
743 Error occurred during update process Warning message on the display Repeat update process, check USB flash drive; *)
745 Update file corrupt Warning message on the display, update process is interrupted Download update file again; check or replace USB flash drive; *)
746 Error occurred during update process Warning message on the display, update process is interrupted Wait for two minutes, then start the update again; *)
751 Time lost Warning message on the display Reset time and date on the inverter; *)
752 Real Time Clock module communication error
753 Internal error: Real Time Clock module is in emergency mode Time may be inaccurate or lost (feeding energy into the grid normal) Reset time and date on the inverter
754 – 755 Provides information about the internal processor status Warning message on the display *)
757 Hardware error in the Real. Time Clock module Error message on the display; the inverter is not feeding any energy into the grid *)
758 Internal error: Real Time Clock module is in emergency mode Time may be inaccurate or lost (feeding energy into the grid normal) Reset time and date on the inverter
760 Internal hardware error Error message on the display *)
761 – 765 Provides information about the internal processor status Warning message on the display *)
766 Emergency power limitation has been activated (max. 750 W) Error message on the display
767 Provides information about the internal processor status Warning message on the display *)
768 Different power limitation in the hardware modules
772 Storage unit not available
773 Software update group 0 (invalid country setup)
775 PMC power stage set not available Warning message on the display Press ‘Enter’ key to acknowledge error; *)
776 Invalid device type
781 – 794 Provides information about the internal processor status Warning message on the display *)

*) If the status code is displayed all the time: Notify a Fronius-trained service technician


Class 10 Fronius status codes:

Error Code Description Behaviour Solution
1000 – 1299 Provide information on the status of the internal processor program Is of no concern when the inverter is working properly and only appears in the “Status PS” setup parameter. In the event of an actual error, this status code assists Fronius Technical Support during the error analysis.

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