Fronius Solar Inverter Fault Code

Error Code
Description
Troubleshooting
102
AC voltage too high
Submit a maintenance service request
103
AC voltage too low
Submit a maintenance service request
105
AC frequency too high
Submit a maintenance service request
106
AC frequency too low
Submit a maintenance service request
107
AC grid outside allowed limits
Submit a maintenance service request
108
Independent operation detected
Submit a maintenance service request
112
A resididual current monitoring unit (RCMU) error has occurred
Submit a maintenance service request
141
Grid frequency jump too high
Submit a maintenance service request
301
Excess AC Current
These faults generally fix themselves within a few hours. If the fault persists restart the system. If the error is still occurring, submit a maintenance service request.
302
Excess DC Current
These faults generally fix themselves within a few hours. If the fault persists restart the system. If the error is still occurring, submit a maintenance service request.
303
DC module overheating
These faults generally fix themselves within a few hours. If the fault persists restart the system. If the error is still occurring, submit a maintenance service request.
304
AC module overheating
These faults generally fix themselves within a few hours. If the fault persists restart the system. If the error is still occurring, submit a maintenance service request.
305
Power is not being fed in, although relay is closed
These faults generally fix themselves within a few hours. If the fault persists restart the system. If the error is still occurring, submit a maintenance service request.
306
PV output is too low to feed
This fault will fix itself, if the fault keeps showing even when sufficient sunlight contact us. NOTE: These codes are shown at morning and night because of the low levels of sunlight at these times.
307
PV output is too low to feed
Shown morning and night because of the low levels of sunlight at these times. If persistent throughout day, submit a maintenance service request.
308
The intermediate circuit voltage is too high
These faults generally fix themselves within a few hours. If the fault persists restart the system. If the error is still occurring, submit a maintenance service request.
309
DC input voltage MPPT 1 is too high
These faults generally fix themselves within a few hours. If the fault persists restart the system. If the error is still occurring, submit a maintenance service request.
311
Polarity of the DC strings is reversed
These faults generally fix themselves within a few hours. If the fault persists restart the system. If the error is still occurring, submit a maintenance service request.
313
DC input voltage MPPT 2 is too high
These faults generally fix themselves within a few hours. If the fault persists restart the system. If the error is still occurring, submit a maintenance service request.
314
Current sensor calibration timeout
These faults generally fix themselves within a few hours. If the fault persists restart the system. If the error is still occurring, submit a maintenance service request.
315
AC current sensor error
Submit a maintenance service request
316
Interrupt check fail
Submit a maintenance service request
317
Unbalanced intermediate circuit voltage
Submit a maintenance service request
318
DC back current detected
Submit a maintenance service request
325
Connection area overheating
Submit a maintenance service request
326
Error with fan 1
Submit a maintenance service request
327
Error with fan 2
Submit a maintenance service request
401
AC Voltage too high
Submit a maintenance service request
406-407
Temperature sensor for AC module is faulty
Submit a maintenance service request
408
DC component measures in the grid too high
Submit a maintenance service request
412
Fixed voltage mode has selected instead of MPP voltage mode.Fixed voltage mode has been set at the wrong value.
Restart system. If code is ongoing submit a maintenance service request.
415
Safety cut out has triggered via option card or RECERBO
Restart system. If code is ongoing submit a maintenance service request.
416
Power stage set has no communication with control system
Restart system. If code is ongoing submit a maintenance service request.
417-419
Hardwire ID issue
Inverter firmware needs to be updated. This needs to be done with enough daylight for whole update or the inverter will need to be replaced with likely no warranty. Submit a maintenance service request.
420
Unable to communicate with Hybrid manager
Inverter firmware needs to be updated. This needs to be done with enough daylight for whole update or the inverter will need to be replaced with likely no warranty. Submit a maintenance service request.
421
HID range error
Inverter firmware needs to be updated. This needs to be done with enough daylight for whole update or the inverter will need to be replaced with likely no warranty. Submit a maintenance service request.
425
Unable to communicate with the power stage set
Inverter firmware needs to be updated. This needs to be done with enough daylight for whole update or the inverter will need to be replaced with likely no warranty. Submit a maintenance service request.
426-428
Hardwire fault
Inverter firmware needs to be updated. This needs to be done with enough daylight for whole update or the inverter will need to be replaced with likely no warranty. Submit a maintenance service request.
431
Software fault
Conduct an AC reset (Switch the AC circuit breaker off and on) ‘ then update the inverter firmware as above. If the fault code continues to appear submit a maintenance service request.
436
Functional incompatibility
Inverter firmware needs to be updated. This needs to be done with enough daylight for whole update or the inverter will need to be replaced with likely no warranty.
437
Power stage fault
Inverter firmware needs to be updated. This needs to be done with enough daylight for whole update or the inverter will need to be replaced with likely no warranty.
438
Functional incompatibility
Inverter firmware needs to be updated. This needs to be done with enough daylight for whole update or the inverter will need to be replaced with likely no warranty.
443
The intermediate circuit voltage is too low or asymmetric
Generally will correct itself within a few hours. If not, restart the system.
445
Compatibility fault. Invalid power stage set configuration.
As per code 436
447
Insulation problem
Generally will correct itself within a few hours. If not, restart the system. If code stays on for a prolonged period submit a maintenance service request.
448
The neutral conducted iOS not connected
Generally will correct itself within a few hours. If not, restart the system. If code stays on for a prolonged period submit a maintenance service request.
450
The guard can’t be found
Generally will correct itself within a few hours. If not, restart the system. If code stays on for a prolonged period submit a maintenance service request.
451
Memory fault detected
Generally will correct itself within a few hours. If not, restart the system. If code stays on for a prolonged period submit a maintenance service request.
452
Communication problem between processors
Installer to attend site and disconnect / reconnect terminals and tighten screws.
453
Power stage set and grid voltage not compatible.
Customer restart system, then monitor over a few days. If the system is continually showing the fault for approx. 3 days request a maintenance service request.
454
Power stage set and grid frequency not compatible.
Customer restart system, then monitor over a few days. If the system is continually showing the fault for approx. 3 days request a maintenance service request.
456
Anto-islanding function is no longer implemented correctly
Customer restart system, then monitor over a few days. If the system is continually showing the fault for approx. 3 days request a maintenance service request.
457
The grid relay sticking or the nuetral conductor ground voltage is too high
Send installer to site to check grounding. Neutral conductor ground voltage has to be less than 30V. Submit a maintenance service request.
458-459
Issues when recording the measuring signal
Restart the system. Check there are no firmware updates. Leave for 24 hours if the fault still persists submit a maintenance service request.
460
Reference voltage source for the DSP is working out of tolerance
Restart the system. Check there are no firmware updates. Leave for 24 hours if the fault still persists submit a maintenance service request.
461
Error with DSP data memory
Restart the system. Check there are no firmware updates. Leave for 24 hours if the fault still persists submit a maintenance service request.
462
Fault with the DC feed monitoring routine
Restart the system. Check there are no firmware updates. Leave for 24 hours if the fault still persists submit a maintenance service request.
463
Reversed AC Polarity
The AC connector has been incorrectly inserted. This should not occur unless the customer has been fiddling with the system or they have had works done onsite and another technician has touched/changed the install. Submit a maintenance service request.
474
RCMU sensor is faulty
Submit a maintenance service request.
475
Insulation fault. The connection between the solar panel and ground is faulty
Submit a maintenance service request.
476
The driver supply voltage is too low
Restart system, if still present, submit a maintenance service request.
479
Immediate circuit relay has switched off
Restart system, if still present after an hour or two, submit a maintenance service request.
480-481
Inverter firmware need to be updated. This needs to be done with enough daylight for whole update or the inverter will need to be replaced with likely no warranty. Submit a maintenance service request.
Restart system, if still present after an hour or two, submit a maintenance service request.
482
The setup phase after initial startup was interrupted
Full system restart required. Turn of AC circuit breaker, after 5 minutes turn back on, then after another 5-10 minutes restart the system. Complete during daylight hours.
483
The voltage UDC fixed on MPP2 string is out of limit
Send installer to site to check MPP settings. If correct and persisting, complete full restart including AC circuit breaker, if still persisting contact Fronius. Submit a maintenance request.
485
CAN transmit buffer is full
Conduct AC reset (turn off, wait 5 minutes and turn on again)
489
Permanent intermediate circuit capacitor over voltage
Submit a maintenance service request.
502
Insulation fault on the solar panels
Generally will correct itself within a few hours. If not, restart the system. If code stays on for a prolonged period submit a maintenance service request.
509
No energy has been fed into the grid in the last 24 hours
Ensure no power outages in the area. If persistent for 2 days or more submit a maintenance service request.
515
Unable to communicate with filter
Generally will correct itself within a few hours. If not, restart the system. If code stays on for a prolonged period submit a maintenance service request.
516
Unable to communicate with the storage unit
Generally will correct itself within a few hours. If not, restart the system. If code stays on for a prolonged period submit a maintenance service request.
517
No energy has been fed into the grid by MPPT 1 in the past 24 hours
Check nothing is blocking inverter air openings, if blocked, remove as these need to be clear. The fault should clear within 5 minutes but if not, restart the system. If the fault is still persistent, inverter may need to be replaced. Submit a maintenance service request.
518
Internal DSP fault
Check nothing is blocking inverter air openings, if blocked, remove as these need to be clear. The fault should clear within 5 minutes but if not, restart the system. If the fault is still persistent, inverter may need to be replaced. Submit a maintenance service request.
519
Unable to communicate with storage unit
Check nothing is blocking inverter air openings, if blocked, remove as these need to be clear. The fault should clear within 5 minutes but if not, restart the system. If the fault is still persistent, inverter may need to be replaced. Submit a maintenance service request.
520
No energy has been fed into the grid by MPPT 1 in the past 24 hours
Check nothing is blocking inverter air openings, if blocked, remove as these need to be clear. The fault should clear within 5 minutes but if not, restart the system. If the fault is still persistent, inverter may need to be replaced. Submit a maintenance service request.
522
DC is low in string 1
Check nothing is blocking inverter air openings, if blocked, remove as these need to be clear. The fault should clear within 5 minutes but if not, restart the system. If the fault is still persistent, inverter may need to be replaced. Submit a maintenance service request.
523
DC is low in string 2
Check nothing is blocking inverter air openings, if blocked, remove as these need to be clear. The fault should clear within 5 minutes but if not, restart the system. If the fault is still persistent, inverter may need to be replaced. Submit a maintenance service request.
528-529
There is a functional incompatibility (one or more of the PC boards are not compatible)
Inverter firmware needs to be updated. This needs to be done with enough daylight for whole update or the inverter will need to be replaced with likely no warranty.
560
Grid frequency has become excessively high which is causing derating
Fault will fix itself, only requires attention if the fault occurs for a prolonged period of time.
564
See error 528-529
Inverter firmware needs to be updated. This needs to be done with enough daylight for whole update or the inverter will need to be replaced with likely no warranty.
566
Arc Detector has been deactivated
Press enter (4th button from the left) wait 5 minutes and error should be clear.
567
The GVDPR is active and inverter will operate with reduced power output
System is still working but at slightly reduced power, code should clear itself within a few hours. If not submit a maintenance service request.
601
CAN bus is full
Inverter firmware needs to be updated. This needs to be done with enough daylight for whole update or the inverter will need to be replaced with likely no warranty.
603
AC module sensor is faulty
Restart system, if still present submit a maintenance service request.
604
DC module sensor is faulty
Restart system, if still present submit a maintenance service request.
607
RCMU Fault
Press enter (4th button from the left) wait 5 minutes and error should be cleared.
608
See error 528-529
Inverter firmware needs to be updated. This needs to be done with enough daylight for whole update or the inverter will need to be replaced with likely no warranty.
609
Configuration value out of limits
Submit a maintenance service request.
701-730
Information about the internal processors status
Fault should clear itself within a few hours. If persistent, restart the system. If problem still not resolved submit a maintenance service request.
721
EEPROM has been reinstalled
Fault should clear itself within a few hours. If persistent, restart the system. If problem still not resolved submit a maintenance service request.
722-730
Information about the internal processors status
Fault should clear itself within a few hours. If persistent, restart the system. If problem still not resolved submit a maintenance service request.
731
USB flash drive not supported
Check the USB flash drive and files, may need to be replaced. Submit a maintenance service request.
732
Initialisation error with USB flash drive
Check the USB flash drive and files, may need to be replaced. Submit a maintenance service request.
733
USB flash drive not connected
Check the USB flash drive and files, may need to be replaced. Submit a maintenance service request.
734
Update file missing or not recognised
Check for updates to Firmware. Run update if required and fault should be cleared. If not, restart the system and if the error still occurs submit a maintenance service request.
735
Update file too old
Contact Fronius to check USB drive and files, may need to be replaced. Have photos of code and inverter serial handy for call. Submit a maintenance service request.
736
Write or read error
Contact Fronius to check USB drive and files, may need to be replaced. Have photos of code and inverter serial handy for call. Submit a maintenance service request.
737
Unable to open file
Contact Fronius to check USB drive and files, may need to be replaced. Have photos of code and inverter serial handy for call. Submit a maintenance service request.
738
Unable to save log file
Contact Fronius to check USB drive and files, may need to be replaced. Have photos of code and inverter serial handy for call. Submit a maintenance service request.
740
Error in file system
Contact Fronius to check USB drive and files, may need to be replaced. Have photos of code and inverter serial handy for call. Submit a maintenance service request.
741
Error recording logging data
Contact Fronius to check USB drive and files, may need to be replaced. Have photos of code and inverter serial handy for call. Submit a maintenance service request.
743
Error during update
Contact Fronius
745
Update file corrupt
Contact Fronius
746
Error while updating
Contact Fronius
751
Time lost
Time and date on inverter needs to be reset. Submit a maintenance service request.
752
Communication error with real time clock module
Time and date on inverter needs to be reset. Submit a maintenance service request.
753
Real time clock module is in emergency mode
Time and date on inverter needs to be reset. Submit a maintenance service request.
754-755
Information about the processors status
Fronius needs to be contacted, generally they will want an installer onsite but can try without if the code is persistent.
757
Real time clock module hardware error
Fronius needs to be contacted, generally they will want an installer onsite but can try without if the code is persistent.
758
Real time clock module is in emergency mode
Time and date on on inverter needs to be reset. If code does not clear instantly restart the system.
760
Internal hardware fault
Submit a maintenance service request.
761-765&767
Information about internal processors status
Submit a maintenance service request.
766-733
Emergency power derating has triggered
Restart inverter, if problem persists submit a maintenance service request.
775
PMC power stage set unavailable
Press enter on the inverter (4th button from left). If problem still persists contact Fronius.
776
Device type invalid
Press enter on the inverter (4th button from left). If problem still persists contact Fronius.
779
CAN bus transmission error
Contact Fronius.
781-794
Information about internal processors status
Contact Fronius.

Contact us 1800 931 668 if you have any questions about Fronius Fault Code.