Fronius Inverter error codes
One of the most popular inverter brands for solar in Australia is the Fronius Inverters range. With a range of inverters from 1.5 to 27kW there’s guaranteed to be suitable inverter 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.
If you find any of the below errors please call us on 1300 054 488, we can be there today to under take a $198* Solar System Performance & Safety Check!
Are you getting the most from your solar system?
Get a 26-point solar system performance and safety check for only $198*.
*Terms and conditions apply.
call 1300 054 488 or
Book Online
For all your electrical and plumbing needs, call us on 1300 054 488.
Fronius IG Inverter
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 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 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 STATE 304 |
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 |
| 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 | 1. Internal fault | If problem persists contact your Fronius Service Partner |
| STATE 306 STATE 307 |
POWER LOW | 1. Intermediate circuit voltage has dropped below permissible threshold value for feed in. | 1. Check panels 2. Internal fault |
| 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 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 | Asymmetry 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 |
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).
| Code | Description | Possible Causes | Remedy (Sequence) |
| 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 occurred 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 fault |
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
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 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 overcurrent 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 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 firmware 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 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 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 keeps 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 inverter’s 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. |
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. |
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 initialised 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 time, contact your local Fronius Service Partner. |
| STATE 738 | Log file cannot be saved (e.g. USB stick 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 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 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 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.
| 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 | 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 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. These STATE codes do not indicate any 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 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 firmware; 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 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 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. |
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 initialised 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 time contact your local Fronius Service Partner. |
| STATE 738 | Log file cannot be saved (e.g. USB stick 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 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 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 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 error | ||
| STATE 316 | Interrupt Check fail | ||
| STATE 325 | Overtemperature in the connection area | ||
| STATE 326 | Fan 1 error | ||
| STATE 327 | Fan 2 error |
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 | – 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 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 |
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 keeps 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 errorConfirm 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. |
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. |
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. |
| 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. |
South East Queensland Fronius Inverter Technicians
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 054 488 or fill in an online solar inverter enquiry form and one of our friendly team will contact you.
Keep your Fronius inverter running at optimal performance with regular maintenance, preventing unexpected breakdowns and costly repairs. Maximise your return on investment by guaranteeing excellent energy production from your solar panels. Properly functioning and serviced inverters will enable the safe and efficient conversion of DC power to AC power.
24/7 Emergency Electricians
Our master electricians are available 24/7 for emergency services in Greater Brisbane & Gold Coast. Offering you peace of mind in stressful circumstances, you can trust that a Fallon Solutions electrician will be there promptly when you need them.
Electrical emergency services are available to residents of:
- Brisbane
- Ipswich
- Logan
- Moreton Bay
- Redlands
- Gold Coast
For residential or commercial electrical emergencies, call us on 1300 054 488.
Fallon Solutions Solar Electricians
Same-Day Service: Our electricians are available across Greater Brisbane, the Gold Coast and the Sunshine Coast so you never have to look far for our trusted technicians.
24/7 Emergency Electrician Service: We are proud to offer emergency electricians to residents of Greater Brisbane & the Gold Coast.
Excellent Customer Service: With thousands of 5-star reviews, we know the importance of quality customer service. Let us guide you through solar installation, repairs and services.
Highly Qualified & Knowledgeable: Our team of solar specialists are experts in their field. With up-to-date qualifications, insurance and extensive knowledge.
We aim to provide you with fast, reliable service with minimal impact to your day. Contact Fallon Solutions on 1300 054 488 or complete our online booking enquiry here.
Trusted by over 5,700 reviewers on Google.
Rated 4.5 stars from more than 5,700 reviews
