Fronius Symo Fault Codes
Fronius Symo fault codes beginning with 1xx
Code | Description | Behaviour | Remedy |
| STATE 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 STATE code keeps recurring contact your solar power system installer. |
| STATE 103 | AC voltage too low | ||
| STATE 105 | AC frequency too high | ||
| STATE 106 | AC frequency too low | ||
| STATE 107 | AC grid outside the permissible limits | ||
| STATE 108 | Stand alone operation detected | ||
| STATE 112 | RCMU error |
Fronius Symo fault codes beginning with 3xx
Code | Description | Behaviour | Remedy |
| STATE 301 | Overcurrent (AC) | Short-term interruption while feeding energy into the grid due to over current in the inverter. The inverter resumes with its startup routine. | Fault is rectified automatically; if this STATE code is displayed all the time: notify your local Fronius service partner. |
| STATE 302 | Overcurrent (DC) | ||
| STATE 303 | DC module over temperature | Short term interruption while feeding energy into the grid due to over temperature. The inverter resumes with its startup routine. | Purge
openings for cooling air and heat sink if necessary; fault is rectified
automatically; if this STATE code keeps recurring contact your solar
power system installer. |
| STATE 304 | AC module over temperature | ||
| STATE 305 | No power being fed in, despite closed relay | Short term interruption while feeding energy into the grid due to over temperature. The inverter resumes with its startup routine. | fault is rectified automatically; if this STATE code keeps recurring contact your solar power system installer. |
| STATE 306 | PV output too low for feeding energy into the grid | Short term interruption while feeding energy into the grid. The inverter resumes with its startup routine. | Fault
is rectified automatically; if this STATE code occurs when there is
sufficient insolation (sunlight) contact your solar power system
installer. IMPORTANT! Due to the low
level of insolation (sunlight) early in the morning and in the evening,
the STATE codes 306 (LOW PV OUTPUT) and 307 LOW PV VOLTAGE) are
displayed routinely at these times of day. These STATE codes do notindicate any kind of fault. |
| STATE 307 | LOW PV VOLTAGE DC input voltage too low for feeding energy into the grid | ||
| STATE 308 | Intermediate circuit voltage too high | Short term interruption while feeding energy into the grid. The inverter resumes with its startup routine. | Fault is rectified automatically; if this STATE code is displayed all the time: notify your local Fronius service partner. |
| STATE 309 | DC input voltage MPPT 1 too high | ||
| STATE 311 | Polarity of DC strings reversed | ||
| STATE 313 | DC input voltage MPPT 2 too high | ||
| STATE 314 | Current sensor calibration timeout | Short term interruption while feeding energy into the grid. The inverter resumes with its startup routine. | Fault is rectified automatically; if this STATE code is displayed all the time: notify your local Fronius service partner. |
| STATE 315 | AC current sensor erro | ||
| STATE 316 | Interrupt Check fail | ||
| STATE 325 | Overtemperature in the connection area | ||
| STATE 326 | Fan 1 error | ||
| STATE 327 | Fan 2 error |
Fronius Symo fault codes beginning with 4xx
Code | Description | Behaviour | Remedy |
| STATE 401 | No communication possible with the power stage set | The inverter will automatically attempt to connect again and, if possible, will resume feeding energy into the grid. | If the STATE code is displayed all the time contact your local Fronius Service Partner |
| STATE 406 | AC module temperature sensor faulty (L1) | ||
| STATE 407 | AC module temperature sensor faulty (L2) | ||
| STATE 408 | DC component measured in the grid too high | ||
| STATE 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 | – | If this STATE code persists contact your solar power system installer |
| STATE 415 | Safety cut out via option card or RECERBO has triggered | The inverter is not feeding any energy into the grid. | If the STATE code is displayed all the time contact your local Fronius Service Partner |
| STATE 416 | No communication possible between power stage set and control system | The inverter will automatically attempt to reconnect again and, if possible, will resume feeding energy into the grid. | |
| STATE 417 | Hardware ID problem | Update the inverter firmwarewith the latest firmware here; if the STATE code is displayed all the time after the firmware update contact your local Fronius Service Partner. | |
| STATE 419 | Unique ID conflict | ||
| STATE 420 | No communication possible with the Hybrid manager | ||
| STATE 421 | HID range error | ||
| STATE 425 | No communication with the power stage set possible | ||
| STATE 426-428 | Possible hardware fault | ||
| STATE 431 | Software problem | The inverter is not feeding any energy into the grid. | Carry
out an AC reset (switch the AC circuit breaker off and on); update
inverter firmware; if this status code is displayed all the time please
contact your local Fronius Service Partner. |
| STATE 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 the inverter firmwarewith the latest firmware here; if the STATE code is displayed all the time after the firmware update contact your local Fronius Service Partner. |
| STATE 437 | Power stage set problem | ||
| STATE 438 | Functional
incompatibility (one or more PC boards in the inverter in the inverter
are not compatible with each other, e.g. after a PC board has been
replaced) | ||
| STATE 443 | Intermediate circuit voltage too low or asymmetric | The inverter is not feeding any energy into the grid. | If the status code is displayed all the time contact your local Fronius Service Partners. |
| STATE 445 | – Compatability 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 for safety reasons. | Update the inverter firmwarewith the latest firmware here; if the STATE code is displayed all the time after the firmware update contact your local Fronius Service Partner. |
| STATE 447 | Insulation fault | If this status code is displayed all the time: notify a local Fronius Service Partner | |
| STATE 448 | Neutral conductor not connected | ||
| STATE 450 | Guard cannot be found | ||
| STATE 451 | Memory error detected | The inverter will automatically attempt to connect again, and if possible, will resume feeding energy into the grid. | If the STATE code is displayed all the time: notify your local Fronius Service Partner. |
| STATE 452 | Communication error between the processors | ||
| STATE 453 | Grid voltage and power stage set are incompatible | ||
| STATE 454 | Grid frequency and power stage set are incompatible | ||
| STATE 456 | Anti-islanding function is no longer implemented correctly | ||
| STATE 457 | Grid relay 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
30V. If problem persists contact your local Fronius Service Partner. |
| STATE 458 | Error when recording the measuring signal | Contact your local Fronius Service Partner. | |
| STATE 459 | Error when recording the measuring signal for the insulation test | ||
| STATE 460 | Reference voltage source for the digital signal processor (DSP) is working out of tolerance | ||
| STATE 461 | Fault in the DSP data memory | ||
| STATE 462 | Error with DC feed monitoring routine | ||
| STATE 463 | Reversed AC polarity, AC connector inserted incorrectly | ||
| STATE 474 | RCMU sensor faulty | ||
| STATE 475 | Solar panel ground fault, insulation fault (connection between solar panel and ground) | ||
| STATE 476 | Driver supply voltage too low | ||
| STATE 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) | Update the inverter firmwarewith the latest firmware here; if the STATE code is displayed all the time after the firmware update contact your local Fronius Service Partner. | |
| STATE 482 | Setup after the initial start-up was interrupted | Perform AC reset (turn AC circuit breaker off and on), complete startup. | |
| STATE 483 | Voltage UDC fixed on MPP2 string out of limits | Check the MPP settings; if the status code is displayed all the time contact your local Fronius Service Partner | |
| STATE 485 | CAN transmit buffer is full | Carry
out an AC reset (turn AC circuit breaker off and on), if the STATE code
continues to be displayed notify your local Fronius Service Partner. |
Fronius Symo fault codes beginning with 5xx
Code | Description | Behaviour | Remedy |
| STATE 502 | Insulation error on the solar panels | Warning message is shown on the display | If this STATE code keeps recurring, contact your solar power system installer. |
| STATE 509 | No energy fed into the grid in the past 24 hours | Acknowledge
STATE code; check whether all the conditions for the problem free
feeding of energy into the grid have been met. If the STATE code is
displayed all the time: look out for further STATE codes. | |
| STATE 515 | No communication with filter possible | If the status code is displayed all the time notify your local Fronius Service Partner. | |
| STATE 516 | No communication possible with the storage unit | Storage unit warning message. | |
| STATE 517 | Power derating caused by too high a temperature | When power derating occurs, a warning message is shown on the display | Purge
cooling air openings and heat sink if necessary; fault is rectified
automatically; if this STATE code keeps recurring contact your solar
power system installer. |
| STATE 518 | Internal DSP malfunction | Warning message on the display | If this STATE code keeps recurring contact your solar power system installer. |
| STATE 519 | No communication possible with the storage unit | Storage unit warning message | |
| STATE 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 has been met. If this STATE code keeps
recurring contact your solar power system installer. |
| STATE 522 | DC low string 1 | Warning message on the display | |
| STATE 523 | DC low string 2 | ||
| STATE 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) | Update the inverter firmwarewith the latest firmware here; if the STATE code is displayed all the time after the firmware update contact your local Fronius Service Partner. | |
| STATE 560 | Derating caused by over-frequency | This
STATE code is displayed when the grid frequency becomes excessively
high. The inverter will then reduce its output. The status indicator
will continue to be displayed until the inverter has returned to normal
operation. | 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. If this STATE code keep recurring
contact your solar power system installer. |
| STATE 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 the inverter firmwarewith the latest firmware here; if the STATE code is displayed all the time after the firmware update contact your local Fronius Service Partner. |
| STATE 566 | Arc detector switched off (e.g. during external arc monitoring) | The STATE code is displayed every day until the arc detector is reactivated. | No error Confirm status code by pressing ‘Enter’. |
| STATE 567 | Grid Voltage Dependent Power Reduction is active | This
state code is a warning informing you that the Grid Voltage Dependent
Power Reduction mode (GVDPR or Volt – Watt mode) has been activated and
the inverter will continue to operate with reduced power output. This is
because the grid voltage has exceeded 250Vac and the GVDPR has been
enabled to try to reduce the voltage rise at the inverters terminals.
This mode must be enabled by default in accordance with the latest
Australian Standards. | Acknowledge status code; if this STATE 567 code keeps recurring contact your local solar power system installer. |
Fronius Symo fault codes beginning with 6xx
Code | Description | Behaviour | Remedy |
| STATE 601 | CAN bus is full | The inverter is not feeding any energy into the grid. | Update the inverter firmwarewith the latest firmware here; if the STATE code is displayed all the time after the firmware update contact your local Fronius Service Partner. |
| STATE 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. | If this STATE code keeps recurring contact your solar power system installer. |
| STATE 604 | DC module temperature sensor faulty | ||
| STATE 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 solar system for damage. |
| STATE 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) | Update the inverter firmwarewith the latest firmware here; if the STATE code is displayed all the time after the firmware update contact your local Fronius Service Partner. |
Fronius Symo fault codes beginning with 7xx
Code | Description | Behaviour | Remedy |
| STATE 701-716 | Provides information about the internal processor status | Warning message is shown on the display | If the STATE code is displayed all the time notify your local Fronius Service Partner. |
| STATE 721 | EEPROM has been re-initialised | Acknowledge STATE code; If the STATE code is displayed all the time contact your local Fronius Service Partner | |
| STATE 722-730 | Provides information about the internal processor status | If the STATE code is displayed all the time contact your local Fronius Service Partner | |
| STATE 731 | Initialisation error – USB flash drive is not supported | Check
or replace USB flash drive. Check the file system on the USB flash
drive. If the STATE code is displayed all the time notify your local
Fronius Service Partner. | |
| STATE 732 | Initialisation erro – Over current on USB stick | ||
| STATE 733 | No USB flash drive connected | Connect or check the USB flash drive. If STATE code is displayed all the time contact your local Fronius Service Partner. | |
| STATE 734 | Update file not recognised or not present | Check
update file (e.g. for correct file name). If STATE code is displayed
all the time contact your local Fronius Service Partner. | |
| STATE 735 | Update file does not match the device, update file too old | Warning message appears on the display, update process is interrupted. | Check the update file with the latest firmware here; if the STATE code is displayed all the time after the firmware update contact your local Fronius Service Partner. |
| STATE 736 | Write or read error occurred | Warning message is shown 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 Transmission’ LED is still flashing or lit. If the STATE code is displayed all the time contact your local Fronius Service Partner. |
| STATE 737 | File could not be opened | Remove and then reinsert USB flash drive; check or replace USB flash drive | |
| STATE 738 | Log file cannot be saved (e.g. USB flash drive is write protected or full) | Create storage space, remove write protection, check or replace USB stick if necessary. If STATE code is displayed all the time contact your local Fronius Service Partner. | |
| STATE 740 | Initialisation error-error in file system on USB flash drive | Check USB flash drive; reformat on PC for FAT12, FAT16 or FAT32. | |
| STATE 741 | Error during recording of logging data | Remove and then reinsert USB flash drive; check or replace USB flash drive | |
| STATE 743 | Error occurred during update process | Repeat the update process, check USB stick. If STATE code is displayed all the time contact your local Fronius Service Partner. | |
| STATE 745 | Update file corrupt | Warning message appears on the display, update process is interrupted. | Re-download update file. If STATE code is displayed all the time contact your local Fronius Service Partner. |
| STATE 746 | Error occurred during update process | Wait
for 2 minutes, then start the update again. If STATE code is displayed
all the time contact your local Fronius Service Partner. | |
| STATE 751 | Time lost | Warning message is shown on the display | Reset
the time and date on the inverter. Check update file (e.g. for correct
file name). If STATE code is displayed all the time contact your local
Fronius Service Partner. |
| STATE 752 | Real Time Clock module communication error | ||
| STATE 753 | Internal error: Real Time Clock module is in emergency mode | Time may be inaccurate or lost (feeding energy into the grid normal) | |
| STATE 754-755 | Provides information about the processor status | Warning message on the display | If STATE code is displayed all the time contact your local Fronius Service Partner. |
| STATE 757 | Hardware error in the Real Time Clock module | Error message is shown on the display; the inverter is not feeding any energy into the grid. | |
| STATE 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 |
| STATE 760 | Internal hardware error | Error message is shown on the display. | If STATE code is displayed all the time contact your local Fronius Service Partner. |
| STATE 761-765 | Provides information about the internal processor status | Warning message is shown on the display. | |
| STATE 766 | Emergency power de-rating has been activated | Error message is shown on the display. | |
| STATE 767 | Provides information about the internal processor status | Warning message is shown on the display. | |
| STATE 768 | Different power limitation in the hardware modules | ||
| STATE 772 | Storage unit not available | ||
| STATE 773 | Software update group 0 (invalid country setup) | ||
| STATE 775 | PMC power stage set not available | Warning message is shown on the display. | Press ‘Enter’ key to acknowledge error. If STATE code is displayed all the time contact your local Fronius Service Partner. |
| STATE 776 | Invalid device type | ||
| STATE 781-794 | Provides information about the internal processor status | Warning message is shown on the display. | If STATE code is displayed all the time contact your local Fronius Service Partner. |