Fronius Primo Fault Codes
Fronius Primo Fault Codes
If you’ve chosen the Fronius Primo inverter for your solar solution, you’ve made a top-notch choice. But, like any advanced piece of technology, there might come a time when it displays a fault code. These codes are the inverter’s way of telling you something’s not quite right. Usually found on the inverter’s display or through its online interface, they provide insights into potential issues.
In this article, we’ll break down each fault code for the Fronius Primo by providing its code number, a description of what it means, the behaviour you might observe, and the best course of action to remedy it.
Fronius Primo codes beginning with 1xx
Code |
Description |
Behaviour |
Remedy |
| STATE 102 | AC voltage too high | Following careful testing and when the grid conditions are within the permissible range again, the inverter will resume feeding energy into the grid. | Check grid connections: If this STATE code keeps recurring contact your solar power system installer. |
| STATE 103 | AC voltage too low | ||
| STATE 105 | AC frequency too high | ||
| STATE 106 | AC frequency too low | ||
| STATE 107 | AC grid outside the permissible limits | ||
| STATE 108 | Stand alone operation detected | ||
| STATE 112 | RCMU error |
Fronius Primo codes beginning with 3xx
Code |
Description |
Behaviour |
Remedy |
| STATE 301 | Overcurrent (AC) | Short-term interruption while feeding energy into the grid due to over current in the inverter. The inverter resumes with its startup routine. |
Fault is rectified automatically; if this STATE code is displayed all the time: notify your local Fronius service partner. |
| STATE 302 | Overcurrent (DC) | ||
| STATE 303 | 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 |
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| 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 codes beginning with 4xx
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 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 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 firmwarewith the latest firmware here; if the STATE code is displayed all the time after the firmware update contact your local Fronius Service Partner. |
| STATE 447 | Insulation fault | If this status code is displayed all the time: notify a local Fronius Service Partner | |
| STATE 448 | Neutral conductor not connected | ||
| STATE 450 | Guard cannot be found | ||
| STATE 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 firmwarewith the latest firmware here; 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 codes beginning with 5xx
Code |
Description |
Behaviour |
Remedy |
| STATE 502 | Insulation error on the solar panels | Warning message is shown on the display | If this STATE code keeps recurring, contact your solar power system installer. |
| STATE 509 | No energy fed into the grid in the past 24 hours | Acknowledge STATE code; check whether all the conditions for the problem free feeding of energy into the grid have been met. If the STATE code is displayed all the time: look out for further STATE codes. | |
| STATE 515 | No communication with filter possible | If the status code is displayed all the time notify your local Fronius Service Partner. | |
| STATE 516 | No communication possible with the storage unit | Storage unit warning message. | |
| STATE 517 | 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. Find out more about the STATE 567 message here |
Fronius Primo codes beginning with 7xx
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 with the latest firmware here; 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. |
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| 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 with the latest firmware here. 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. |