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Fronius Inverter error codes

One of the most popular brands in Australia, Fronius Inverters range from 1.5 to 27kW with a guarantee to be suitable for virtually any solar system size from residential to large scale industrial.

Fallon Solutions have extensive experience with solar inverters and we realise not everything is perfect all the time. Here you can find a list is a list of common Fronius inverter Error Codes with potential errors and solutions to fix them.

Fronius IG Inverter

Fronius IG STATE codes beginning with 1xx

Fronius STATE codes beginning with 1 usually only occur temporarily and are caused by the power from the electrical mains (grid) being outside the inverters operating parameters.

Code Description Possible causes Remedy (sequence)
STATE 101 Grid voltage beyond permitted limits 1. Mains voltage error

2. Incorrect values in the service menu

3. Internal fault

1. Check grid voltage, check circuit breakers are ON

2. Change values in the service menu

3. If problem persists contact your Fronius Service Partner

STATE 104 Mains frequency beyond permitted limits. 1. Mains frequency error

2. Incorrect values in the service menu

3. Internal fault

1. Check mains frequency, check circuit breakers are ON

2. Change values in the service menu

3. If problem persists contact your Fronius Service Partner

STATE 107 Synchronisation with the public mains supply not possible 1. Mains not connected

2. Incorrect values in the service menu

3. Internal fault

1. Connect mains power, check circuit breakers are ON

2. Check values in the service menu

3. If problem persists contact your Fronius Service Partner

STATE 108 Islanding detected 1. Islanding detected

2. Severe disturbances in public mains

3. Internal fault

1. Automatic correction

2. Automatic correction

3. If problem persists contact your Fronius Service Partner

Fronius IG STATE codes beginning with 2xx

Fronius IG STATE codes beginning with 2 are messages from the grid monitoring device (ENS) integrated within the inverter and refer to the parameters of the public mains.

Code Description Possible causes Remedy (sequence)
STATE 101 Grid voltage beyond permitted limits 1. Mains voltage error

2. Incorrect values in the service menu

3. Internal fault

1. Check grid voltage, check circuit breakers are ON

2. Change values in the service menu

3. If problem persists contact your Fronius Service Partner

STATE 104 Mains frequency beyond permitted limits. 1. Mains frequency error

2. Incorrect values in the service menu

3. Internal fault

1. Check mains frequency, check circuit breakers are ON

2. Change values in the service menu

3. If problem persists contact your Fronius Service Partner

STATE 107 Synchronisation with the public mains supply not possible 1. Mains not connected

2. Incorrect values in the service menu

3. Internal fault

1. Connect mains power, check circuit breakers are ON

2. Check values in the service menu

3. If problem persists contact your Fronius Service Partner

STATE 108 Islanding detected 1. Islanding detected

2. Severe disturbances in public mains

3. Internal fault

1. Automatic correction

2. Automatic correction

3. If problem persists contact your Fronius Service Partner

Fronius IG STATE codes beginning with 3xx

Fronius IG STATE codes beginning with 3 are error states that can occur during grid feed-in operation, however, they do not indicate damaged electronics and do not lead to a remaining interruption of the feed-in operation.

Code Description Possible causes Remedy (sequence)
STATE 301 Safety circuit detects a current peak on the mains supply. 1. Voltage drop on the public mains

2. Internal fault

1. Automatic correction

2. If problem persists contact your Fronius Service Partner

STATE 302 Safety circuit detects a current peak on the PV generator side 1. Voltage drop on the public mains supply

2. Internal fault

1. Automatic correction

2. If problem persists contact your Fronius Service Partner

STATE 303 Heat sink temperature on the DC-AC board is too high 1. Ventilation slot congested

2. Very high ambient temperature

3. Distance between inverters too small

4. Internal fault

1. Free ventilation slot

2. Change location of inverter

3. Increase distance between inverters

4. If problem persists contact your Fronius Service Partner

STATE 304 Heat sink temperature on the DC-DC board is too high
STATE 305 Feed-in process not possible, even though public mains parameter within the limits Internal fault If problem persists contact your Fronius Service Partner
STATE 306 POWER LOW Intermediate circuit voltage has dropped below permissible threshold value for feed in. 1. Check panels

2. Internal fault

STATE 307 DC LOW 1. DC-input voltage is too low for feed in

2. Internal fault

STATE 308 Intermediate circuit voltage out of the maximum limit 1. Public mains disturbances

2. Internal fault

1. Reinforce mains cable

2. If problem persists contact your Fronius Service Partner

Fronius IG STATE codes beginning with 4xx

Fronius IG STATE codes beginning with 4 are error states that require the intervention of a Fronius Service Partner. They are either temporary or lasting and are triggered by faulty hardware or a software problem.

Code Description Possible causes Remedy (sequence)
STATE 401 Communication error between IG control and the DC-DC board Internal fault If problem persists contact your Fronius Service Partner
STATE 402 Write access to the internal Fronius IG memory failed
STATE 403 The area in the internal memory for the country setting is incomplete
STATE 404 Connection between the control unit and the ENS is faulty 1. Public mains not connected

2. Internal fault

1. Check the public mains

2.If problem persists contact your Fronius Service Partner

STATE 405 An old or incorrect version of the ENS microprocessors has been recognised Internal fault If problem persists contact your Fronius Service Partner
STATE 406 Temperature sensor on the DC-AC board faulty or not connected
STATE 407 Temperature sensor on the DC-DC board faulty or not connected
STATE 408 Unsymmetry on the public mains detected 1. Public mains disturbances

2. Internal fault

1. Error is remedied automatically

2. If problem persists contact your Fronius Service Partner

STATE 409 Supply of the DC-AC board not available Internal fault If problem persists contact your Fronius Service Partner
STATE 410 Service plug on the DC-AC board is not set correctly
STATE 412 Value for fixed voltage is set higher than the open circuit voltage of the PV generator
STATE 413 Open circuit voltage too high in the moment of transformer switching
STATE 414 Memory array for Fronius IG type in EE-PROM faulty 1. One-off – memory error

2. Internal fault

1. Error is remedied automatically

2. If problem persists contact your Fronius Service Partner

STATE 415 No END-enabling signal despite release by IG-control Internal fault If problem persists contact your Fronius Service Partner
STATE 416 Communication error between IG-Control and power stack 1. One-off – communication error

2. Internal fault

1. Error is remedied automatically

2. If problem persists contact your Fronius Service Partner

STATE 417 Hardware ID-collision Internal fault If problem persists contact your Fronius Service Partner
STATE 419 Two or more power stacks with identical Unique ID
STATE 420 Incomplete number of power stacks detected after reaching online threshold according to device type
STATE 421 Hardware ID sequence error
STATE 425 Receive time-out for data exchange with one or more power stacks exceeded 1. One off error

2. Internal fault

1. Automatic correction

2.If problem persists contact your Fronius Service Partner

STATE 431 All power stacks are in boot mode Internal fault If problem persists contact your Fronius Service Partner
STATE 432 Consistent error in power stack management 1. One off error

2. Internal fault

1. Automatic correction

2.If problem persists contact your Fronius Service Partner

STATE 433 Allocation error of dynamic addresses
STATE 434 Ground fault detected
STATE 435 Wrong configuration for EE-Prom
STATE 436 Error transmission faulty
STATE 437 Power stack work around is active
STATE 438 Error during state code transmission 1. One-off error

2. Permanent error

1. Automatic correction

2.If problem persists contact your Fronius Service Partner

STATE 441 Power rack fan faulty Internal fault If problem persists contact your Fronius Service Partner
STATE 442 Master for one phase could not be assigned 1. Temporary communication error

2. Internal fault

1. Error is remedied automatically

2. If problem persists contact your Fronius Service Partner

STATE 443 DC-DC energy transfer failure. 1. Error during switching on a power stack

2. Internal fault

1. Error is remedied automatically

2. If problem persists contact your Fronius Service Partner

STATE 444 AC monitoring self test interrupted During the self test another error occurred Quit the self test by pressing ESC and remedy the failure according to the error code list

Fronius IG STATE codes beginning with 5xx

Fronius IG STATE codes beginning with 5 generally do not stop the feed-in operation of the Fronius IG inverter. The STATE codes will be displayed until the message is acknowledged by pushing a button on the display (the inverter will work in feed-in operation during this time).

STATE 501 Heat sink temperature too high, although Fronius IG is on low output 1. Ventilation slot congested

2. Internal fault

1. Free ventilation slot

2.If problem persists contact your Fronius Service Partner

STATE 502 An isolation fault between DC+ or DC- to earth has been detected Isolation fault at the solar generator Check cables and solar generator
STATE 504 An error occured while scanning LocalNet addresses Identical Fronius IG address used twice Check address of the inverters and other components
STATE 505 The area in the internal memory for the “Setup” values is incomplete 1. One off error

2. Internal fault

1. Automatic correction

2.If problem persists contact your Fronius Service Partner

STATE 506 The area in the internal memory for the “Total” values is incomplete
STATE 507 The area in the internal memory for the “Day/Year” values is incomplete
STATE 508 The area in the internal memory for the “WR number” is damaged
STATE 509 No feed in operation for 24 hours 1. Snow covered or very dirty solar panels

2. Insufficient power from the solar panels for feed in operation

3.Internal error

1. Clean solar panels or remove snow

2. If problem persists contact your Fronius Service Partner

STATE 510 Errors detected by LocalNet self diagnostic system 1. One-off memory error

2. Internal fault

1. Automatic correction

2. If problem persists contact your Fronius Service Partner

STATE 511 Errors detected by LocalNet Sensor Card self diagnostic system
STATE 512 According to the device type too many power stacks have been detected 1. One-off error

2. Internal fault

STATE 513 Power stacks in boot mode
STATE 514 Incomplete number of power stacks detected after reaching online threshold – Device type
STATE 515 One or more power stacks notified STATE 406/ 407/ 409/ 410 Internal fault If problem persists contact your Fronius Service Partner

 

 


 

FRONIUS GALVO COMMON ERRORS

Fronius Galvo STATE codes beginning with 1xx

Fronius STATE codes beginning with 1 usually only occur momentarily and are caused by the power from the street (the grid) being outside the inverters operating parameters.

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

Fronius Galvo STATE codes beginning with 3xx

Fronius Galvo STATE codes beginning with 3 are 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.

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 Safety circuit detects a current peak on the PV generator side
STATE 303 Power stage set 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 Internal temperature too high
STATE 306 LOW PV OUTPUT

Intermediate circuit voltage 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 not indicate any kind of fault.

STATE 307 LOW PV VOLTAGE

DC input voltage too low for feeding energy into the grid

STATE 308 Intermediate circuit overvoltage 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 too high

Fronius Galvo STATE codes beginning with 4xx

Fronius STATE codes beginning with 4 are error states that require the intervention of a Fronius Service Partner. They are either temporary or lasting and are triggered by faulty hardware or a software problem.

Code Description Behaviour Remedy
STATE 401 No communication with power stage set possible 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 Power stage set temperature sensor faulty
STATE 407 Internal temperature sensor faulty
STATE 408 DC feeding into the grid detected
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 425 No communication possible with the power stage set
STATE 445 Invalid limit value settings 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 452 Communication error between the processors 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 453 Short term grid voltage error
STATE 454 Short term grid frequency error
STATE 457 Grid relay sticking The inverter is not feeding any energy into the grid. 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 472 Fuse for solar panel ground is faulty Replace fuse for solar panel ground; if this STATE code keeps recurring contact your solar power system installer.
STATE 475 Solar panel ground, insulation fault (connection between solar panel and ground) If this STATE code keeps recurring, contact your solar power system installer
STATE 482 Startup incomplete Perform AC reset (turn AC circuit breaker off and on), complete startup.

Fronius Galvo STATE codes beginning with 5xx

Fronius STATE codes beginning with 5 generally do not stop the feed in operation of the Fronius Galvo inverter. The STATE codes will be displayed until the message is acknowledged by pushing a button on the display (the inverter will work in feed in operation during this time).

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 It is normal to see the state 509 code when the inverter has just been installed.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 516 Firmware fault Firmware fault with the inverter, firmware update required. Update the inverter firmware; if the STATE code is displayed all the time after the firmware update contact your local Fronius Service Partner.
STATE 517 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 551 Fuse for solar panel ground is faulty Warning is shown on display Replace fuse for solar panel ground; if this STATE code keeps recurring contact your solar power system installer.
STATE 558 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) Possible error displays or malfunction on the inverter If this STATE code keeps recurring contact your solar power system installer.
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 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 the STATE 567 code keeps recurring contact your local solar power system installer.
STATE 568 Incorrect input signal on the multifunction current interface The STATE code is displayed in the case of an incorrect input signal on the multi-function 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 multi-function current interface; if this STATE code keeps recurring contact your solar power system installer.

Fronius Galvo STATE codes beginning with 6xx

Some of the class 6 STATE codes necessitate intervention by a Fronius Service Partner.

Code Description Behaviour Remedy
STATE 668 Incorrect input signal on the multi-function current interface The inverter is not feeding any energy into the grid. The STATE code is displayed in the case of an incorrect input signal at the multi-function current interface and with the following setting:

Basic menu / Input signal / Mode of operation = Ext. Signal, triggering method = Ext. Stop

Check the devices connected to the multi-function interface; if this STATE code keeps recurring: notify your local Fronius service partner.

Fronius Galvo STATE codes beginning with 7xx

Class 7 STATE codes on Fronius Galvo inverters 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.

Code Description Behaviour Remedy
STATE 705 Conflict when setting the inverter number (e.g. number already assigned) Correct the inverter number via the setup menu
STATE 721 EEPROM has been reinitialised or EEPROM is faulty Warning message is shown on the display Acknowledge STATE code; If the STATE code is displayed all the time contact your local Fronius Service Partner
STATE 731 Initialisation error – USB stick is not supported Check or replace USB stick. Check the file system on the USB stick. If the STATE code is displayed all the time notify your local Fronius Service Partner.
STATE 732 Over current on USB stick
STATE 733 No USB stick connected Connect or check the USB stick. 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. Update the inverter firmware; 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 stick and the data contained on it or replace USB stick.

Never unplug a USB stick if the ‘Data Transmission’ LED is still flashing or lit.

If the STATE code is displayed all the contact your local Fronius Service Partner.

STATE 738 Log file cannot be saved (e.g. USB stick is write protected or full)t 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 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 firmware, if the STATE code is displayed all the time after the firmware update 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 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. If STATE code is displayed all the time contact your local Fronius Service Partner.
STATE 758 Internal error: Real Time Clock module is in emergency mode Time may be inaccurate or lost (feeding energy into the grid normal)..
STATE 766 Emergency power de-rating has been activated Error message is shown on the display.

 

Fronius Primo Inverter

Fronius Primo STATE codes beginning with 1xx

Fronius STATE codes beginning with 1 usually only occur momentarily and are caused by the power from the street (the grid) being outside the inverters operating parameters.

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 Primo STATE codes beginning with 3xx

Fronius Primo STATE codes beginning with 3 are 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.

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 Power stage set 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 Internal temperature too high
STATE 306 LOW PV OUTPUT

Intermediate circuit voltage 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 not indicate any kind of fault.

STATE 307 LOW PV VOLTAGE

DC input voltage too low for feeding energy into the grid

STATE 308 Intermediate circuit overvoltage 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 313 DC input voltage MPPT 2 too high

Fronius Primo STATE codes beginning with 4xx

Fronius STATE codes beginning with 4 are error states that require the intervention of a Fronius Service Partner. They are either temporary or lasting and are triggered by faulty hardware or a software problem. Try switching off the Fronius inverter following the system shutdown procedure, leave off for a few minutes then attempt to restart. If the fault continues please contact your local Fronius Service Partner for further assistance.

Code Description Behaviour Remedy
STATE 401 No communication with power stage set possible 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 Power stage set temperature sensor faulty
STATE 407 Internal temperature sensor faulty
STATE 408 DC feeding into the grid detected
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
STATE 419 Unique ID conflict
STATE 421 HID range error
STATE 425 No communication possible with the power stage set
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 the 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 firm ware; if this status code is displayed all the time please 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 Invalid limit value settings The inverter is not feeding any energy into the grid for safety reasons. Update the inverter firmware; 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 452 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 Short term grid voltage error
STATE 454 Short term grid frequency error
STATE 456 Anti-islanding function is no longer implemented correctly
STATE 457 Grid relay sticking The inverter is not feeding any energy into the grid. 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 If this STATE code keeps recurring, contact your solar power system installer
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 firmware; if the STATE code persists contact your local Fronius Service Partner
STATE 482 Startup incomplete 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 Primo STATE codes beginning with 5xx

Fronius STATE codes beginning with 5 generally do not stop the feed in operation of the Fronius Primo inverter. The STATE codes will be displayed until the message is acknowledged by pushing a button on the display (the inverter will work in feed in operation during this time).

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 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 522 DC1 Input Voltage too low The DC voltage on input 1 of the inverter is too low Check voltage & polarity on input 1 of the inverter. If this STATE code keeps recurring please contact your solar power system installer.
STATE 523 DC2 Input Voltage too low The DC voltage on input 2 of the inverter is too low Check voltage & polarity on input 2 of the inverter. Check MPP settings / voltage at the “Installer Menu Basic”. If this STATE code keeps recurring please contact your solar power system installer.
STATE 558 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) Possible error displays or malfunction on the inverter If this STATE code keeps recurring contact your solar power system installer.
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 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 Primo STATE codes beginning with 7xx

Class 7 STATE codes on Fronius Primo inverters 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.

Code Description Behaviour Remedy
STATE 705 Conflict when setting the inverter number (e.g. number already assigned) Correct the inverter number via the setup menu
STATE 721 EEPROM has been reinitialised or EEPROM is faulty Warning message is shown on the display Acknowledge STATE code; If the STATE code is displayed all the time contact your local Fronius Service Partner
STATE 731 Initialisation error – USB stick is not supported Check or replace USB stick. Check the file system on the USB stick. If the STATE code is displayed all the time notify your local Fronius Service Partner.
STATE 732 Over current on USB stick
STATE 733 No USB stick connected Connect or check the USB stick. 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. Update the inverter firmware; if the STATE code is displayed all the time after the firmware update contact your local Fronius Service Partner. If STATE code is displayed all the time contact your local Fronius Service Partner.
STATE 736 Write or read error occurred Warning message is shown on the display Check USB stick and the data contained on it or replace USB stick.

Never unplug a USB stick if the ‘Data Transmission’ LED is still flashing or lit.

If the STATE code is displayed all the contact your local Fronius Service Partner.

STATE 738 Log file cannot be saved (e.g. USB stick is write protected or full)t 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 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. Redownload the firmware. 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 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. If STATE code is displayed all the time contact your local Fronius Service Partner.
STATE 758 Internal error: Real Time Clock module is in emergency mode Time may be inaccurate or lost (feeding energy into the grid normal)..
STATE 766 Emergency power de-rating has been activated Error message is shown on the display.

 

Fronius Symo

Fronius SYMO STATE codes beginning with 1xx

Fronius STATE codes beginning with 1 usually only occur momentarily and are caused by the power from the street (the grid) being outside the inverters operating parameters. The Fronius inverter reacts by disconnecting from the grid and attempts to switch on again after the specified mains monitoring period, if no further errors occur during this period. The STATE code is displayed whilst the grid is being checked.

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 STATE codes beginning with 3xx

Fronius SYMO STATE codes beginning with 3 are 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.

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 not indicate 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 STATE codes beginning with 4xx

Fronius STATE codes beginning with 4 are error states that require the intervention of a Fronius Service Partner. They are either temporary or lasting and are triggered by faulty hardware or a software problem. Try switching off the Fronius inverter following the system shutdown procedure, leave off for a few minutes then attempt to restart.

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 firmware; 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 firmware; 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 firmware; 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 firmware; 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 STATE codes beginning with 5xx

Fronius STATE codes beginning with 5 generally do not stop the feed in operation of the Fronius SYMO inverter. The STATE codes will be displayed until the message is acknowledged by pushing a button on the display (the inverter will work in feed in operation during this time).

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 firmware;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 firmware 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 STATE codes beginning with 6xx

Class 6 STATE codes on Fronius SYMO inverters necessitate intervention by a Fronius trained service engineer.

Code Description Behaviour Remedy
STATE 601 CAN bus is full The inverter is not feeding any energy into the grid. Update the inverter firmware; 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 firmware; if the STATE code is displayed all the time after the firmware update contact your local Fronius Service Partner.

Fronius SYMO STATE codes beginning with 7xx

Class 7 STATE codes on Fronius SYMO inverters 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.

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; 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.

Fallon Solutions can take care of all your Fronius solar Inverter issues and offer upgrades to your solar installation or we can offer a 26 point safety check of your existing system. Simply call us on 1300 762 260 or fill in an online solar inverter enquiry form and one of our friendly team will contact you.

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