Fronius Fault Codes

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Fronius Error Codes

Error Code Description Solution
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 Independant operation detected submit a maintenance service request
112 A resididual current monitoring unit (RCMU) error has occured 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 occuring, 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 occuring, 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 occuring, 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 occuring, 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 occuring, 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 persistant 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 occuring, 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 occuring, 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 occuring, 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 occuring, 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 occuring, 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 Conducat 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 interupted 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
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
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.