Inverter Fault  ?
Providing Best Support
‍Hybrid Solar Solutions Australia

Error Code / Meaning / Solution

‍No AC Connection – No Utility grid connected or utility grid power failure‍

‍- This error would normally occur during a grid failure, if you still have electricity connected to your property then check your AC isolator or circuit breaker. If both the Isolator and CB are 'on' and if the problem persists customers should submit a support ticket‍

‍AC V Outrange – Utility grid voltage is out of permissible range

‍‍- This could happen particularly in the summer months if there is a lot of solar in your area, if the problem persist please contact your local utility or submit a support ticket‍

‍AC F Outrange – Utility grid frequency is out of range‍

‍- This could happen particularly in the summer months if there is a lot of solar in your area, if the problem persist please contact your local utility or submit a support ticket‍Over

Temperature – Temperature out of range‍

‍- Restart inverter. If still present, contact Growatt. NOTE: Ensure inverter is not covered causing inverter to overheat‍

‍PV Isolation Low – Insulation Problem‍

‍- Send installer to site:

‍‍1. Check if panel enclosure ground properly.‍

‍2. Check if inverter ground properly.‍

‍3. Check if the DC breaker gets wet‍

‍4. If the error message is displayed despite the above checking passed. Contact Growatt‍

‍Output High DCI – Output current DC offset too high

‍‍- Have customer restart inverter. If error persists, customers should submit a support ticket.‍

‍Residual 1 High – Leakage current too high‍

‍-Customer restart inverter, If error persists, submit ticket etc‍

‍PV Voltage High – DC input voltage is exceeding the maximum tolerable value‍

‍- Disconnect DC switch immediately and switch off system, customers should submit a support ticket

‍‍Auto Test Failed – Auto Test Failed‍

‍- restart inverter and fault will clear‍

‍100 – Voltage Fault‍

‍- Submit a support ticket‍

‍101 – Communication Fault
102 – Consistent Fault. Data received by Master and Slave processor are different

‍- Installer to attend site and complete the ff:‍Turn off the DC switch and make the inverter totally shut down, and then turn on DC switch to check if the error still exists. If the error persists customers should submit a support ticket.

‍‍116 – EEPROM Fault‍

‍-When inverter displays Error: 116, it means there is failure in reading or writing EEPROM.

‍‍a. Check when the error appears, if in the morning, if only in the morning, contact Growatt for support.‍if all day:‍

‍b. restart the inverter, check whether the error still exists.

‍‍c. If the fault is sustained, control board needs to be replaced.‍

‍117 – Relay Fault‍

‍- There is something wrong with the relay circuit. Restart the inverter, if the error still exists, contact support.‍

‍118 – Init Model Fault

‍‍- Send Installer to site to complete the ff:

‍‍If a fault is detected during initialization, there will be a model fault displayed in the LCD Screen.‍

‍a. To clear the fault, you need to reset the values with the parameter setting tool ShineBus.‍Once done restart 2-3 times. If error is still persistent ESD customers should submit a support ticket‍

‍119 – GCFI Device Damage‍

‍- Something may be wrong with the GCFI device inside the inverter.

‍‍a. Restart the inverter for 2-3 times, check whether the error still exists.‍

‍b. If the error still exists, ESD customers should submit a support ticket.‍

‍120 – HCT Fault‍

‍- When the inverter shows ERROR 120, it means there is something wrong with the current sensor.

‍‍Restart the inverter, if the error still exists, ESD customers should submit a support ticket.

‍121 – Communication Fault, Master processor can’t receive data from slave processor.‍

‍- Installer to attend site and complete the ff:‍

‍Turn off the DC switch and make the inverter totally shut down, and then turn on DC switch to check if the error still exists. If the error persists customers should submit a support ticket.‍

‍122 – Bus Voltage Fault

‍- Installer to attend site and complete the FF:

a. Restart the inverter, and check whether the error still exists. (Customer can do this first)

b. Turn off AC breaker, measure the voltage between PV+ to PV- and check whether it is within DC Voltage range

c. Turn on AC breaker, and read Bus Voltage from LCD (PV: XXX B: XXX), if B: XXX is really too high, please record

PV: XXX B:XXX, and contact Growatt service.

Customers should submit a support ticket:

102 – AC Voltage too high - ESD customers should submit a support ticket
103 - AC Voltage too low - ESD customers should submit a support ticket
105 - AC Frequency too High - ESD customers should submit a support ticket
106 – AC Frequency too Low - ESD customers should submit a support ticket
107 – AC Grid outside allowed limits - ESD customers should submit a support ticket
108 - Independent operation detected - ESD customers should submit a support ticket
112 – A residual current monitoring unit (RCMU) error has occurred - ESD customers should submit a support ticket
141 – Grid frequency jump too high
315 – AC current sensor error
316 – Interrupt check fail
317 – Unbalanced Intermediate circuit Voltage
318 - DC back current detected
325 – Connection Area overheating
326 – Error with fan 1
327 – Error with fan 2
401 – AC voltage is too high
406, 407 – Temperature sensor for AC module is faulty
408 – DC Component measures in the grid is too high
474 - RCMU sensor is faulty
475 – Insulation fault. The connection between the solar panel and the ground is faulty.
609 – Configuration Value out of limits
489 – Permanent intermediate circuit capacitor overvoltage
760 – Internal Hardware Fault
761-765 & 767 – Information about the internal processor’s status



These faults generally fix themselves within a few hours. If the fault is persistent, the customer can restart the system:
301 – Excess AC Current
302 - Excess DC current
303 – DC Module overheating
304 – AC Module overheating
305 – Power is not being fed in, although relay is closed
309 – The intermediate circuit voltage is too high
311 – Polarity of the DC strings is reversed
313 - DC Input voltage MPPT 2 is too high
314 - Current sensor calibration timeout
443 – The intermediate circuit voltage is too low or asymmetric

This fault will fix itself, if the fault keeps showing even when sufficient sunlight contact your solar installer.
NOTE These codes are shown at morning and night because of the low levels of sunlight at these times:

306 – PV output is too low to feed
Shown morning and night because of the low levels of sunlight at these times.:

307 – PV output is too low to feed

Restart system:
412 – Fixed voltage mode has been selected instead of MPP voltage mode and the fixed voltage mode has been set at the wrong value.
415 – Safety cut out triggered via option card or RECERBO
416 – Power stage set has no communication with control system
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:

417-419 – Hardware ID Issue
420 Unable to connect with Hybrid manager
421 – HID range error
425 – Unable to communicate with the power stage set
426-428 – Hardwire Fault
Conduct an AC reset (Switch the AC circuit breaker off and on) then update the inverter firmware as above:

431 – Software 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. This can be done remotely:

436 – Functional Incompatibility
437 – Power stage fault
438 – Functional Incompatibility

445 – Compatibility fault. Invalid power stage set configuration
480,481 – Functional Incompatibility – PC Boards need to be updated
528, 529, 564, 608 – There is a functional incompatibility (one or more of the PC boards are not compatible)
Generally will correct itself within a few hours. If not, restart the system. If code stays on for prolonged period, contact support:

447 – Insulation Problem
448 – The neutral conducted is not connected
450 - The Guard can’t be found
451 – Memory Fault detected
701-716 – Information about the internal processor’s status
721 – EEPROM has been reinstalled
722-730 – Information about the internal processor’s status
Installer to attend site and disconnect /reconnect terminals and tighten screws:

452 – Communication problem between processors
Customer restart system, then monitor over a few days. If the system is continually showing the fault approx 3 days, contact support:

453 – Power stage set and grid voltage not compatible
454 – Power stage set and grid frequency not compatible
456 – Anti-islanding function is no longer implemented correctly
Send installer to site to check grounding. Neutral conductor ground voltage has to be less than 30V.

457 - The Grid Relay sticking or the neutral conductor ground voltage is too high.
Have customer restart system. Optimus to check there are no firmware updates through the portal (Update if required) then Leave for 24hrs:

458, 459 – Issues when recording the measuring signal
460 – Reference voltage source for the DSP is working out of tolerance
461 – Error with the DSP data memory
462 – Fault with the DC feed monitoring routine
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:

463 – Reversed AC Polarity
Restart system & give it an hour:

476 – The driver supply voltage is too low
479 – Immediate circuit relay has switched off.
Full system restart required- turn of AC circuit breaker after 5 minutes, turn back on. then after another 5-10minutes, restart the system:

482 – The setup phase after initial start-up was interrupted
Send installer to site to check MPP settings. If correct and persisting, complete full restart including AC circuit breaker, if persisting contact fronius while still onsite.

483 – The voltage UDC fixed on MPP2 string is out of limit
Conduct AC reset (turn off, wait 5 minutes and turn on again):

485 – CAN transmit buffer is full
generally will correct itself within a few hours. If not, restart the system. If code stays on for prolonged period, contact support:

502 – Insulation fault on the solar panels
Ensure no power outages in the area. If persistent for 2 days, ESD customers should submit a support ticket

509 – No energy has been fed into the grid in the last 24 hours
Generally will correct itself within a few hours. If not, restart the system. If code stays on for prolonged period, contact support:

515 – Unable to communicate with filter
516 – 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 fault is still persistent, inverter may need to be replaced but Fronius will generally want an installer to go out and check over system. customers should submit a support ticket:

517 – Overheating which is causing power derating
518 – Internal DSP Fault
519 – Unable to communicate with storage unit
520 – No energy has been fed into the grid by MPPT1 in the past 24 hours
522 – DC is low in string 1
523 - DC is low in string 2

Fault will fix itself, only required attention if occurring for prolonged period constantly:

560 – Grid Frequency has become excessively high, which is causing derating.


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
607 – RCMU Fault
775 – PMC Power stage set unavailable
776 – Device type invalid
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. This can be done remotely, customers should submit a support ticket:

601 – CAN bus is full
Restart system, if still present customers should submit a support ticket:

603 – AC Module sensor is faulty
604 – DC module sensor is faulty
Check the USB flash drive and files, may need to be replaced. ESD customers should submit a support ticket:

731 – USB flash drive not supported
732 – Initialisation error with USB flash drive
733 – USB flash drive not connected
Check for updates to Firmware on the portal. Update if required. code should clear, if not have customer restart. If still occurring, contact support:

734 – Update file missing or not recognised
contact Fronius to check USB drive and files, may need to be replaced.
Have photos of code and inverter serial handy for call. customers should submit a support ticket:

735 – Update file too old
736 – Write or read error
737 – Unable to open file
738 – Unable to save log file
740 – Error in file system
741 – Error recording logging data

Contact Fronius:

743 – Error during an update
745 – Update file corrupt
746 – Error while updating
779 – CAN Bus transmission error
781-794 – Information about internal processor’s status

Time and date on inverter needs to be reset:

751 – Time Lost
752 – Communication Error with real time clock module
753 – Real time clock module is in emergency mode

Fronius needs to be contacted, generally they will want an installer onsite but can try without if the code is persistant:

754, 755 – Information about the processor’s status
757 – Real time clock module hardware error

Time and date on inverter needs to be reset. can do remotely through the portal. if code does not clear instantly, customer may need to restart system:

758 – Real time clock module is in emergency mode

Restart Inverter. If problem persists, contact support:

766-773 – Emergency Power derating has triggered.

‍