Fronius Fault Codes

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Fronius Error Codes

Error CodeDescriptionSolution
102AC voltage too highsubmit a maintenance service request
103AC voltage too lowsubmit a maintenance service request
105AC frequency too highsubmit a maintenance service request
106AC frequency too lowsubmit a maintenance service request
107AC grid outside allowed limitssubmit a maintenance service request
108Independant operation detectedsubmit a maintenance service request
112A resididual current monitoring unit (RCMU) error has occuredsubmit a maintenance service request
141Grid frequency jump too highsubmit a maintenance service request
301Excess AC CurrentThese 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.
302Excess DC CurrentThese 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.
303DC module overheatingThese 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.
304AC module overheatingThese 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.
305Power is not being fed in, although relay is closedThese 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.
306PV output is too low to feedThis 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.
307PV output is too low to feedShown morning and night because of the low levels of sunlight at these times. If persistant throughout day, submit a maintenance service request.
308The intermediate circuit voltage is too highThese 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.
309DC input voltage MPPT 1 is too highThese 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.
311Polarity of the DC strings is reversedThese 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.
313DC input voltage MPPT 2 is too highThese 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.
314Current sensor calibration timeoutThese 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.
315AC current sensor errorsubmit a maintenance service request
316Interrupt check failsubmit a maintenance service request
317Unbalanced intermediate circuit voltagesubmit a maintenance service request
318DC back current detectedsubmit a maintenance service request
325Connection area overheatingsubmit a maintenance service request
326Error with fan 1submit a maintenance service request
327Error with fan 2submit a maintenance service request
401AC Voltage too highsubmit a maintenance service request
406-407Temperature sensor for AC module is faultysubmit a maintenance service request
408DC component measures in the grid too highsubmit a maintenance service request
412Fixed 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.
415Safety cut out has triggered via option card or RECERBORestart system. If code is ongoing submit a maintenance service request.
416Power stage set has no communication with control systemRestart system. If code is ongoing submit a maintenance service request.
417-419Hardwire ID issueInverter 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.
420Unable to communicate with Hybrid managerInverter 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.
421HID range errorInverter 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.
425Unable to communicate with the power stage setInverter 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.
426-428Hardwire faultInverter 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.
431Software faultConducat 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.
436Functional incompatibilityInverter 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.
437Power stage faultInverter 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.
438Functional incompatibilityInverter 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.
443The intermediate circuit voltage is too low or asymmetricGenerally will correct itself within a few hours. If not, restart the system.
445Compatibility fault. Invalid power stage set configuration.As per code 436
447Insulation problemGenerally 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.
448The neutral conducted ios not connectedGenerally 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.
450The guard can’t be foundGenerally 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.
451Memory fault detectedGenerally 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.
452Communication problem between processorsInstaller to attend site and disconnect / reconnect terminals and tighten screws.
453Power 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.
454Power 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.
456Anto-islanding function is no longer implemented correctlyCustomer 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.
457The grid relay sticking or the nuetral conductor ground voltage is too highSend installer to site to check grounding. Neutral conductor ground voltage has to be less than 30V. Submit a maintenance service request.
458-459Issues when recording the measuring signalRestart the system. Check there are no firmware updates. Leave for 24 hours if the fault still persists submit a maintenance service request.
460Reference voltage source for the DSP is working out of toleranceRestart the system. Check there are no firmware updates. Leave for 24 hours if the fault still persists submit a maintenance service request.
461Error with DSP data memoryRestart the system. Check there are no firmware updates. Leave for 24 hours if the fault still persists submit a maintenance service request.
462Fault with the DC feed monitoring routineRestart the system. Check there are no firmware updates. Leave for 24 hours if the fault still persists submit a maintenance service request.
463Reversed AC PolarityThe 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.
474RCMU sensor is faultySubmit a maintenance service request.
475Insulation fault. The connection between the solar panel and ground is faultySubmit a maintenance service request.
476The driver supply voltage is too lowRestart system, if still present, submit a maintenance service request.
479Immediate circuit relay has switched offRestart system, if still present after an hour or two, submit a maintenance service request.
480-481Inverter 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.
482The setup phase after initial startup was interuptedFull 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.
483The voltage UDC fixed on MPP2 string is out of limitSend 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.
485CAN transmit buffer is fullConduct AC reset (turn off, wait 5 minutes and turn on again)
489Permanent intermediate circuit capacitor over voltageSubmit a maintenance service request.
502Insulation fault on the solar panelsGenerally 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.
509No energy has been fed into the grid in the last 24 hoursEnsure no power outages in the area. If persistent for 2 days or more submit a maintenance service request.
515Unable to communicate with filterGenerally 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.
516Unable to communicate with the storage unitGenerally 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.
517No energy has been fed into the grid by MPPT 1 in the past 24 hoursCheck 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.
518Internal DSP faultCheck 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.
519Unable to communicate with storage unitCheck 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.
520No energy has been fed into the grid by MPPT 1 in the past 24 hoursCheck 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.
522DC is low in string 1Check 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.
523DC is low in string 2Check 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.
528-529There 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.
560Grid frequency has become excessively high which is causing deratingFault will fix itself, only requires attention if the fault occurs for a prolonged period of time.
564See error 528-529 
566Arc Detector has been deactivatedPress enter (4th button from the left) wait 5 minutes and error should be clear.
567The GVDPR is active and inverter will operate with reduced power outputSystem is still working but at slightly reduced power, code should clear itself within a few hours. If not submit a maintenance service request.
601CAN bus is fullInverter 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.
603AC module sensor is faultyRestart system, if still present submit a maintenance service request.
604DC module sensor is faultyRestart system, if still present submit a maintenance service request.
607RCMU FaultPress enter (4th button from the left) wait 5 minutes and error should be cleared.
608See error 528-529 
609Configuration value out of limitsSubmit a maintenance service request.
701-730Information about the internal processors statusFault should clear itself within a few hours. If persistent, restart the system. If problem still not resolved submit a maintenance service request.
721EEPROM has been reinstalledFault should clear itself within a few hours. If persistent, restart the system. If problem still not resolved submit a maintenance service request.
722-730Information about the internal processors statusFault should clear itself within a few hours. If persistent, restart the system. If problem still not resolved submit a maintenance service request.
731USB flash drive not supportedCheck the USB flash drive and files, may need to be replaced. Submit a maintenance service request.
732Initialisation error with USB flash driveCheck the USB flash drive and files, may need to be replaced. Submit a maintenance service request.
733USB flash drive not connectedCheck the USB flash drive and files, may need to be replaced. Submit a maintenance service request.
734Update file missing or not recognisedCheck 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.
735Update file too oldContact 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.
736Write or read errorContact 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.
737Unable to open fileContact 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.
738Unable to save log fileContact 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.
740Error in file systemContact 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.
741Error recording logging dataContact 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.
743Error during updateContact Fronius
745Update file corruptContact Fronius
746Error while updatingContact Fronius
751Time lostTime and date on inverter needs to be reset. Submit a maintenance service request.
752Communication error with real time clock moduleTime and date on inverter needs to be reset. Submit a maintenance service request.
753Real time clock module is in emergency modeTime and date on inverter needs to be reset. Submit a maintenance service request.
754-755Information about the processors statusFronius needs to be contacted, generally they will want an installer onsite but can try without if the code is persistent.
757Real time clock module hardware errorFronius needs to be contacted, generally they will want an installer onsite but can try without if the code is persistent.
758Real time clock module is in emergency modeTime and date on on inverter needs to be reset. If code does not clear instantly restart the system.
760Internal hardware faultSubmit a maintenance service request.
761-765 & 767Information about internal processors statusSubmit a maintenance service request.
766-733Emergency power derating has triggeredRestart inverter, if problem persists submit a maintenance service request.
775PMC power stage set unavailablePress enter on the inverter (4th button from left). If problem still persists contact Fronius.
776Device type invalidPress enter on the inverter (4th button from left). If problem still persists contact Fronius.
779CAN bus transmission errorContact Fronius.
781-794Information about internal processors statusContact Fronius.

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