All Fronius status codes, what they mean & how to fix them!
Below is a list of the various codes that may appear on your Fronius inverter. We recommend restarting your inverter if any issues do arise.
Just like restarting your computer, restarting your inverter can fix some common issues.
These common issues include:
- Faults and errors that are displayed on the inverter (take note of these before restarting your inverter in case the error continues). These may relate to external factors like grid voltage or wiring
- The system not communicating with internet monitoring (you may also need to restart your modem)
- If the system is generally not performing as it should
In the event that restarting your inverter doesn’t work, here is a list of what to do in the event of each Fronius status code.
| 1 XX Fronius Inverter Error Codes | ||
| Code | Meaning | What To Do? |
| #102 | The AC voltage is too high | Contact your GEM Energy 1300 969 471. |
| #103 | The AC voltage is too low | |
| #105 | The AC frequency is too high | |
| #106 | The AC frequency is too low | |
| #107 | The AC grid outside the allowed limits | |
| #108 | Independent operation detected | |
| #112 | A residential current monitoring unit (RCMU) error has occurred | |
| #141 | Grid frequency has jumped too high | This value can be adjusted to the grid via menupoint RoCoF (Rate of Change of Frequency) in the Menu. Alternatively, contact GEM Energy |
| 3 XX Fronius Inverter Error Codes | ||
| Code | Meaning | What To Do? |
| #301 | Excess AC current | The fault will fix itself. If the fault keeps appearing, contact GEM Energy. |
| #302 | Excess DC current | |
| #303 | DC module overheating | |
| #304 | AC module overheating | |
| #305 | Power is not being fed in, although the relay is closed | |
| #306 | The PV output is too low to feed | The fault will fix itself. If the fault keeps appearing even insufficient sunlight, contact GEM Energy |
| #307 | The PV output is too low to feed | Contact GEM Energy |
| #308 | The intermediate circuit voltage is too high | The fault will fix itself. If the fault keeps appearing, contact GEM energy |
| #309 | The DC input voltage MPPT (maximum power point tracker is too high) | |
| #311 | The polarity of the DC strings reversed. | The fault will fix itself. If the fault keeps appearing, contact GEM Energy |
| #313 | The DC input voltage MPPT (maximum power point tracker) 2 is too high. | |
| #314 | Current sensor calibration timeout | |
| #315 | AC current sensor error | Contact GEM Energy 1300 969 471 |
| #316 | Interrupt check fail | |
| #317 | Unbalanced intermediate circuit voltage | |
| #318 | DC bank current detected | |
| #325 | Connection area overheating | |
| #326 | Error with fan 1 | |
| #327 | Error with fan 2 | |
| 4 XX Fronius Inverter Error Codes | ||
| Code | Meaning | What To Do? |
| #401 | The AC voltage is too high | Contact GEM Energy 1300 969 471 |
| #406 | Temperature sensor for AC module is faulty (1) | |
| #407 | Temperature sensor for DC module is faulty (L2) | |
| #408 | DC component measured in the grind is too high | |
| #412 | Fixed voltage mode has selected instead of MPP voltage mode and the fixed voltage mode has been set at the wrong value. | If this code continues to appear, contact GEM Energy |
| #415 | Safety cut out has triggered via option card or RECERBO | Contact GEM Energy 1300 969 471 |
| #416 | Power stage set has no communication with control system | |
| #417 | Hardware ID issue | Contact GEM Energy |
| #419 | Unique ID issue | |
| #420 | Unable to communicate with hybrid manager | |
| #421 | HID ranger error | |
| #425 | Unable to communicate with power stage set | |
| #426, #427, #428 | Hardware fault | |
| #431 | Software fault | Conduct an AC reset (switch it off and on); update inverter firmware, if the fault continues to appear, contact GEM Energy |
| #436 | Functional incompatibility | Contact GEM Energy 1300 969 471 |
| #437 | Power stage fault | |
| #438 | Functional incompatibility | |
| #443 | The intermediate circuit voltage is too low or asymmetric | |
| #445 | Compatibility fault – invalid power stage set configuration | |
| #447 | Insulation problem | If the fault continues to appear, contact GEM Energy |
| #448 | The neutral conductor is not connected. | |
| #450 | The guard can’t be found | If the fault continues to appear, contact GEM Energy |
| #451 | Memory fault detected | |
| #452 | Communication problem between processors | |
| #453 | Power stage set and grid voltage are not compatible | |
| #454 | Power stage and grid frequency are not compatible | |
| #456 | Anti-islanding function is no longer implemented correctly | |
| #457 | The grid relay sticking or the neutral conductor ground voltage is too high | |
| #458 | Issues when recording measuring signal. | Contact GEM Energy 1300 969 471 |
| #459 | Issues when recording the measuring signal for insulation test. | |
| #460 | Reference voltage source for the DSP (digital signal processor) is working out of tolerance | |
| #461 | Error in the DSP (digital signal processor) data memory | |
| #462 | Fault with the DC feed monitoring routine | |
| #463 | Reversed AC polarity, The AC connector has been incorrect;y inserted | |
| #474 | The RCMU sensor is faulty | |
| #475 | Insulation fault (the connection between the solar panel and the ground is faulty) | |
| #476 | The driver supply voltage is too low | |
| #479 | Intermediate circuit relay has switched off | |
| #480, #481 | Functional incompatibility (one or more PC boards in the inverter are not compatible together) | Contact GEM Energy |
| #482 | The setup phase after the initial start-up was interrupted. | Conduct an AC reset (turn it off and on again); complete start-up |
| #483 | The voltage UDC fixed on MPP2 string is out of limits. | Check MPP setting, if code continues to appear contact GEM Energy |
| #485 | The CAN transmit buffer is full | Conduct an AC reset (turn it off and on again); codes continues to appear then contact GEM Energy |
| #489 | Permanent intermediate circuit capacitor overvoltage. | Contact GEM Energy |
| 5 XX Fronius Inverter Error Codes | ||
| Code | Meaning | What To Do? |
| #502 | Insulation fault on the solar panel | If code continues to appear, contact GEM Energy |
| #509 | No energy has been fed into the grid in the last 24 hours | Check for any other state code, if code continues to appear, contact GEM Energy |
| #515 | Unable to communicate with filter | If code continues to appear, contact GEM Energy |
| #516 | Unable to communicate with storage unit | |
| #517 | Overheating which is causing power derating | Purge cooling air openings, the fault will fix itself; if code continues to appear, contact GEM Energy |
| #518 | Internal DSP fault | If code continues to appear, contact GEM Energy |
| #519 | Unable to communicate with storage unit | |
| #520 | No energy has been fed into the grid by MPPT1 in the past 24 hours | |
| #522 | The DC is low on string 1 | |
| #523 | The DC is low in string 2 | |
| #528, #529 | There is a functional incompatibility (one or more of the PC boards are not compatible) | Contact GEM Energy 1300 969 471 |
| #560 | The grid frequency has become excessively high which is causing derating | Code will fix itself; if the code continues to appear, contact GEM Energy |
| #564 | There is a functional incompatibility (one or more of the PC boards are not compatible) | Contact GEM Energy 1300 969 471 |
| #566 | The arc detector has been deactivated | Press enter (4th button from the left). |
| #567 | The GVDPR (grid voltage-dependent power reduction mode) is active and the inverter will operate with reduced power output | If code continues to appear, contact GEM Energy |
| XX 6 Fronius Inverter Error Codes | ||
| Code | Meaning | What To Do? |
| #601 | The CAN bus is full | Contact GEM Energy 1300 969 471 |
| #603 | The AC module sensor is faulty | |
| #604 | The DC module sensor is faulty. | |
| #607 | RCMU fault | Press enter (4th from the left button); if the code keeps showing, contact GEM Energy |
| #608 | There is a functional incompatibility (one or more of the PC boards are not compatible) | Update the inverters firmware, if the code continues to appear, contact GEM Energy |
| #609 | Configuration Value of Limits | Seek intervention by a Fronius-trained service engineer. |
| XX 7 Fronius Inverter Error Codes | ||
| Code | Meaning | What To Do? |
| #701-716 | Information about the internal processors status | If code continues to appear, contact GEM Energy |
| #721 | EEPROM has been reinitialized | |
| #722-730 | INformation about the internal processors status | |
| #731 | USB flash drive not supported | Check the USB flash drive and the files, if necessary, replace. |
| #732 | Initialisation error with USB flash drive | |
| #733 | USB flash drive not connected | Check the USB flash drive and the files, if necessary, replace; contact GEM Energy |
| #734 | Update file not recognised or missing | Check the update file for issues, if necessary change file to match the device; if the code keeps showing, contact GEM Energy |
| #735 | Update file is too old or does not match the device | |
| #736 | Write read error | Check the USB flash drive and the files, if necessary, replace; If code continues to appear, contact GEM Energy |
| #737 | Unable to open file | |
| #738 | Unable to save log file | Create space on the USB flash drive; Check the USB flash drive and the files, if necessary, replace; If code continues to appear, contact GEM Energy |
| #740 | Error in file system on USB flash drive | Check the USB flash drive and the files, if necessary, replace; If code continues to appear, contact GEM Energy |
| #741 | Error recording logging data | |
| #743 | Error during update | Try the update again, check USB flash drive and replace if necessary; if the code keeps showing, contact GEM Energy |
| #745 | The update file is corrupt | Download update file retry update; if the code keeps appearing, contact GEM Energy |
| #746 | Error while updating | Wait few minutes and try updating again; if the code keeps showing, contact GEM Energy |
| #751 | Time lost | Reset the time and date on the inverter; if the code continues to appear contact GEM Energy |
| #752 | Communication error with real-time clock module | |
| #753 | The real-time clock module is in emergency mode | Reset the time and date;if the code continues to appear contact GEM Energy |
| #754-755 | Information about the processors status | If the code continues to appear contact GEM Energy |
| #757 | Real-time clock module hardware error | Real-time clock module hardware error |
| #758 | Real-time clock module is in emergency mode | Real-time clock module is in emergency mode |
| #760 | Internal hardware fault | If the code continues to appear contact GEM Energy |
| #761-765 | Information about the internal processors status | |
| #766 | Emergency power derating has triggered | |
| #767 | Information about the internal processors status | |
| #768 | There is a contrasting power limitation in the hardware modules | |
| #772 | Storage unit unavailable | |
| #773 | Invalid country setup | |
| #775 | The OMC power stage set unavailable | Press enter (4th button from the left); if the code continues to appear contact GEM Energy |
| #776 | The device type is invalid | |
| #779 | CAN bus transmission error | Contact GEM Energy |
| #781-794 | Information about the internal processors status | If this code keeps showing, contact GEM Energy |