Fronius IG Plus Inverter Status Error Codes

Fronius IG Plus Inverter State Error Codes

If your solar system uses a Fronius inverter and it develops a fault, contact AC Gold and we’ll get your solar PV system back up and generating electricity.

If your Fronius inverter is still under warranty, the cost of repairing or replacing it will be covered by Fronius.

Download Fronius Agilo Solar Inverter Manual.

When a Fronius inverter develops a fault, it usually displays a status code to explain what is wrong. The following table lists the Fronius Galvo series inverter status codes so you can learn what your Fronius Galvo inverter is telling you and how to fix it.

Looking for another Fronius Inverter Error Code? Fronius Galvo error code | Fronius ECO error code | Fronius Fronius Primo error code | Fronius SYMO error code

Class 1 Fronius status codes:

Class 1 status codes are typically temporary. Their cause lies in the public grid. The initial response of the inverter is to disconnect itself from the grid. The grid is subsequently checked for the stipulated monitoring period. If after the end of this period no further defect is identified, your inverter resumes operating and feeding power into the grid.IMPORTANT! The 2nd position x defines the exact network point for the following status codes:0 = several / all 3 phases
1 = L1
2 = L2
3 = L3

Error Code Description Details Rectification
1×2 AC voltage too high Grid conditions are thoroughly tested and as soon as they are again within the permissible range, the inverter will resume feeding power into the grid. Check grid connections and fuses Should the status code persist, you should contact your system installer
1×3 AC voltage too low Grid conditions are thoroughly tested and as soon as they are again within the permissible range, the inverter will resume feeding power into the grid. Check grid connections, breakers and disconnect. Should the status code persist, yo u should contact your system installer
1×5 AC frequency too high Grid conditions are thoroughly tested and as soon as they are again within the permissible range, the inverter will resume feeding power into the grid. Check grid connections and fuses. Should the status code persist, you should contact your system installer
1×6 AC frequency too low Grid conditions are thoroughly tested and as soon as they are again within the permissible range, the inverter will resume feeding power into the grid. Check grid connections and fuses. Should the status code persist, you should contact your system installer
1×7 No AC grid detected Grid conditions are thoroughly tested and as soon as they are again within the permissible range, the inverter will resume feeding power into the grid. Check grid connections and fuses. Should the status code persist, you should contact your system installer
108 Islanding detected Grid conditions are thoroughly tested and as soon as they are again within the permissible range, the inverter will resume feeding power into the grid. Should the status code persist, you should contact your system installer
109 General grid error. This error is always displayed first for grid errors. After reviewing all power stage sets, the grid error is specified in more detail: 1×1 / 1×4 or the display remains at “109” (e.g., when 2 phases report “104” and one phase “101”) Grid conditions are thoroughly tested and as soon as they are again within the permissible range, the inverter will resume feeding power into the grid. Check grid connections and fuses. Should the status code persist, you should contact your system installer

Class 2 status codes:

Status codes of class 2 are typically temporary. Their cause lies in the grid.

The first reaction of the inverter is to disconnect from the grid. Subsequently, the grid will be checked for the duration of the observation period stipulated. If after the end of this period no further defect is identified, the inverter resumes operating and feeding power into the grid.

IMPORTANT! The 2nd position x defines the exact network point for the following status messages: 0 = several / all 3 phases 1 = L1 2 = L2 3 = L3

Error Code Description Details Rectification
2×2 Grid voltage exceeds admissible limits As soon as the grid voltage has returned to admissible range, the inverter resumes feeding power into the grid. Check grid voltage; if the status code persists you should contact your electrical contractor
2×3 Grid voltage below admissible limits As soon as the grid voltage has returned to admissible range, the inverter resumes feeding power into the grid. Check grid voltage, if the status code persists you should contact your electrical contractor
207 No grid voltage detected As soon as the grid conditions have returned to admissible range, the inverter resumes feeding power into the grid. Check grid connections and fuses; if the status code does not disappear you should contact your electrical contractor

Class 3 Fronius status codes:

Class 3 comprises status codes that may appear during feed-in operation and that do not cause a permanent interruption of the operation of feeding power into the grid.

After automatic disconnection from the grid and waiting for its conditions to return to those stipulated, your inverter will try to resume feed-in operation.

Error Code Description Details Rectification
301 Overcurrent (AC) Short interruption of power feeding into the grid due to overcurrent. The inverter returns to the startup phase. Fault is rectified automatically. If this status code keeps recurring, contact your system installer
302 Overcurrent (DC) Short interruption of power feeding into the grid due to overcurrent. The inverter returns to the startup phase. Fault is rectified automatically. If this status code keeps recurring, contact your system installer
303 Over-temperature buck converter Short interruption of power feeding into the grid due to over temperature. The inverter returns to the startup phase. Fault is rectified automatically. If this status code keeps recurring, contact your system installer
304 Over-temperature cooling element Short interruption of power feeding into the grid due to over temperature. The inverter returns to the startup phase. Fault is rectified automatically. If this status code keeps recurring, contact your system installer
305 No power transfer to grid possible Continual interruption of grid feed operation Should the status code persist, you should contact your system installer
‘POWER LOW’ (306) Intermediate circuit voltage has dropped below permissible threshold value for feed in. This error is shown on the inverter in plain text. Short interruption of power feeding into the grid. The inverter returns to the startup phase. Fault is rectified automatically. If this status code keeps recurring, contact your system installer
‘DC LOW’ (307) DC input voltage is too low for feed in. This error is shown on the inverter in plain text. Short interruption of power feeding into the grid. The inverter returns to the startup phase. Fault is rectified automatically. If this status code keeps recurring, contact your system installer
308 Intermediate circuit voltage too high. Short interruption of power feeding into the grid. The inverter returns to the startup phase. Fault is rectified automatically. If this status code keeps recurring, contact your system installer

Class 4 Fronius status codes:

Class 4 status codes may require the intervention of a trained Fronius service technician.

Error Code Description Details Rectification
401 No internal communication with power stage set The inverter will automatically attempt to connect again and, if possible, resume feeding power into the grid Check grid connections and fuses. If status code persists: Contact a Fronius-trained service technician
402 Communication with EEPROM not possible The inverter will automatically attempt to connect again and, if possible, resume feeding power into the grid. If status code persists: Contact a Fronius-trained service technician
403 EEPROM faulty The inverter will automatically attempt to connect again and, if possible, resume feeding power into the grid. If status code persists: Contact a Fronius-trained service technician
406 One or both temperature sensors are defective The inverter disconnects from the grid for safety reasons. If status code persists: Contact a Fronius-trained service technician
407 Temperature sensor at cooling element defective The inverter disconnects from the grid for safety reasons. If status code persists: Contact a Fronius-trained service technician
408 Direct current feed in The inverter disconnects from the grid for safety reasons. If status code persists: Contact a Fronius-trained service technician
412 The “fixed voltage” setting has been selected instead of MPP voltage operation and the voltage is set to too low a value, or DC voltage exceeds allowable limits. Fixed voltage lower than the current MPP voltage. If the status code persists, you should contact a Fronius-trained service technician, or remove excess solar modules so DC voltage fits within inverter limits. If status code persists: Contact a Fronius-trained service technician
413 Control problems The inverter briefly disconnects from the grid, if AC voltage or frequency are out of range. If status code persists: Contact a Fronius-trained service technician
414 EEPROM faulty Memory deleted If status code persists: Contact a Fronius-trained service technician
416 Communication with IG Brain not possible. The Operating Status LED lights up orange, then the inverter attempts a restart. If status code persists: Contact a Fronius-trained service technician
417 Two power stage sets have the same PCB number The inverter stops feeding power into the grid, the display shows a critical error via a red Operating Status LED If status code persists: Contact a Fronius-trained service technician
419 Two or more power stage sets with an identical software serial number detected. The inverter stops feeding power into the grid, the display shows a critical error via a red Operating Status LED If status code persists: Contact a Fronius-trained service technician
421 PCB number has been set incorrectly The inverter stops feeding power into the grid, the display shows a critical error via a red Operating Status LED. If status code persists: Contact a Fronius-trained service technician
425 Communication with the power stage set is not possible The Operating Status LED lights up orange, then the inverter attempts a restart. If status code persists: Contact a Fronius-trained service technician
431 All power stage sets are in boot mode The inverter stops feeding power into the grid, the display shows a critical error via a red Operating Status LED. Update firmware using Bootloader or Fronius Solar.update/IG Plus
Switches between SLAVE / DC LOW or SLAVE / POWER LOW (439) The MPP master power stage set is switched off because of an error in a slave power stage set (in the balance mode). The inverter stops feeding power into the grid, the display shows a critical error via a red Operating Status LED. If status code persists: Contact a Fronius-trained service technician
Switches between SLAVE / DC LOW or SLAVE / POWER LOW (439) The MPP master power stage set is switched off because of a fauilty GFDI fuse. The inverter stops feeding power into the grid, the display shows a critical error via a red Operating Status LED. Check the GFDI fuse and replace it, if necessary. If status code persists: Contact a Fronius-trained service technician
442 No phase master for a phase The inverter stops feeding power into the grid, the display shows a critical error via a red Operating Status LED. If status code persists: Contact a Fronius-trained service technician
443 Energy transfer not possible The inverter stops feeding power into the grid, the display shows a critical error via a red Operating Status LED. If status code persists: Contact a Fronius-trained service technician
445 Invalid power stage set configuration The inverter stops feeding power into the grid, the display shows a critical error via a red Operating Status LED. If status code persists: Contact a Fronius-trained service technician
446 Internal communication error with the NL-MON plug-in card The inverter will automatically attempt to connect again and, if possible, resume feeding power into the grid Check grid connections and fuses; If status code persists: Contact a Fronius-trained service technician
447 The NL-MON plug-in card has interrupted grid monitoring The inverter will automatically attempt to connect again and, if possible, resume feeding power into the grid If status code persists: Contact a Fronius-trained service technician
448 The neutral conductor N is not connected The inverter disconnects from the grid for safety reasons. If status code persists: Contact a Fronius-trained service technician
450 The monitoring of the power stage set main processor ‘Guard’ is active The inverter stops feeding power into the grid, the display shows a critical error via a red Operating Status LED. If status code persists: Contact a Fronius-trained service technician
451 The EEPROM Guard Control is defective The inverter stops feeding power into the grid, the display shows a critical error via a red Operating Status LED. If status code persists: Contact a Fronius-trained service technician
452 Communication between ‘Guard’ and the digital signal processor (DSP) has been interrupted The inverter stops feeding power into the grid, the display shows a critical error via a red Operating Status LED. If status code persists: Contact a Fronius-trained service technician
453 Error in grid voltage recording The inverter stops feeding power into the grid, the display shows a critical error via a red Operating Status LED. If status code persists: Contact a Fronius-trained service technician
454 Error in grid voltage recording The inverter stops feeding power into the grid, the display shows a critical error via a red Operating Status LED. If status code persists: Contact a Fronius-trained service technician
455 Reference power source for AC measurement is operating outside of tolerances The inverter stops feeding power into the grid, the display shows a critical error via a red Operating Status LED. If status code persists: Contact a Fronius-trained service technician
456 Error during anti-islanding test The inverter stops feeding power into the grid, the display shows a critical error via a red Operating Status LED. If status code persists: Contact a Fronius-trained service technician
457 Grid relay stuck The inverter stops feeding power into the grid, the display shows a critical error via a red Operating Status LED. If status code persists: Contact a Fronius-trained service technician
460 Reference power source for the digital signal processor (DSP) is operating outside of tolerances The inverter stops feeding power into the grid, the display shows a critical error via a red Operating Status LED. If status code persists: Contact a Fronius-trained service technician
461 Error in DSP data memory The inverter stops feeding power into the grid, the display shows a critical error via a red Operating Status LED. If status code persists: Contact a Fronius-trained service technician
464 Display error. The software and/or hardware versions of the display and IG Brain are not compatible. The inverter stops feeding power into the grid, the display shows a critical error via a red Operating Status LED. Update firmware using Bootloader or Fronius Solar.update/IG Plus
465 Display error. The UI command sent from the IG Brain is not recognized by the present display version. The inverter stops feeding power into the grid, the display shows a critical error via a red Operating Status LED. If status code persists: Contact a Fronius-trained service technician
466 Display error. The display was not detected. The inverter stops feeding power into the grid, the display shows a critical error via a red Operating Status LED. Check the display for damage, connect display, check ribbon wire for damage, check IG Brain for damage. If status code persists: Contact a Fronius-trained service technician
467 The display has not received a start command from the IG Brain for longer than 6 s. The inverter will automatically attempt to connect again and, if possible, resume feeding power into the grid. If status code persists: Contact a Fronius-trained service technician
469 Throttle connected to wrong poles The inverter stops feeding power into the grid, the display shows a critical error via a red Operating Status LED. Properly connect throttle. If status code persists: Contact a Fronius-trained service technician
470 The buck converter relay does not open at high DC voltage The inverter stops feeding power into the grid, the display shows a critical error via a red Operating Status LED. Check system configuration. If status code persists: Contact a Fronius-trained service technician
472 Ground fault detected. (ground fault = one of the current-carrying DC conductors or solar module interconnect cables touches the ground wire or a grounded component) Inverter is blocked from feeding energy into the grid. Check GFDI fuse for continuity. Replace if necessary.

Class 5 Fronius status codes:

Class 5 status codes generally do not impair the operation of feeding power into the grid. They will be displayed until the service code is acknowledged by pressing a key (the inverter, however, continues working normally in the background).
– press any key
– error message disappears

Error Code Description Details Rectification
501 One of the two fans is defective Low power generation because the temperature in the unit is too high. If status code persists: Contact a Fronius-trained service technician
504 No Solar Net communication possible Inverter address issued twice. — The Solar Net components required are in the inverter: However, communication is still not currently possible. Change inverter address (section: ‘The setup menu’) — Status code will disappear after changing the inverter address
505 EEPROM faulty Data from the Setup menu are lost. Remedied automatically
506 EEPROM faulty Data from the ‘Total’ menu are lost. Remedied automatically
507 EEPROM faulty Data from the ‘Day’ / ‘Year’ menu are lost. Remedied automatically
508 Inverter address incorrect Address for data communication is no longer saved. Set address again
509 24h no feed in Example: solar modules covered with snow Example: remove snow from solar modules
510 EEPROM faulty SMS settings were restored to default. If necessary, reconfigure SMS
511 EEPROM faulty Sensor card settings were restored to default If necessary, reconfigure metering channels
512 Too many power stage sets in the system Too many power stage sets have been detected in the system. If status code persists: Contact a Fronius-trained service technician
513 Power stage set in boot mode One or more power stage sets cannot be activated, because they are in boot mode. Update power stage set firmware
514 No communication with one of the power stage sets. Warning message from one of the power stage sets, second power stage set working normally If status code persists: Contact a Fronius-trained service technician
515 Faulty plug connections Temperature sensor on cooling element faulty or not connected properly. If status code persists: Contact a Fronius-trained service technician
516 Status codes present for one of the power stage sets. It is not possible to activate all power stage sets Carry out analysis. For more information, see the ‘The setup menu’ section. If status code persists: Contact a Fronius-trained service technician
517 Change of master has taken place. Transformer not connected / not plugged in. Bridge short-circuit. Detection of intermediate circuit voltage damaged Check possible errors referred to in ‘Description.’ If status code persists: Contact a Fronius-trained service technician
550 String fuse defective. One or more string fuses are defective. Measure string fuses and replace any that are defective
550 Jumper set incorrectly The jumper on the C-Box PC board was not reset to the ‘SMon’ position after the solar module strings were checked Set the jumper on the C-Box PC board to the ‘SMon’ position
553 Phase master deactivated due to frequently occurring errors A reintegration of the power stage set into the Mix network will be attempted at a later time. If status code persists: Contact a Fronius-trained service technician
554 NL-Mon EEPROM error Default set switch off limits were restored automatically. System-specific changes in the ‘Advanced’ service menu have to be redone; If status code persists: Contact a Fronius-trained service technician
558 Feature deactivated (e.g., inverter control via the Fronius Power Control Box option) A feature had to be deactivated (e.g., after component replacement). The status message is no longer displayed after the next DC disconnect. Confirm error, update firmware using Bootloader or Fronius Solar.update/IG Plus, if required (The inverter will also operate problem-free without updating the firmware)

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