Fronius IG 15/20/30/40/60 or 60 HV Solar Inverter – Error Messages and Fault Readings


  • Energy bill higher than usual?

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  • Installer gone broke?

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  • Out of manufacturer’s warranty by just a few months?

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Fronius inverters

are made in Austria but services Australia. Good quality inverter with a local service agent. Although considered more expensive than other inverter options, Fronius have a quality rating of 8.6/10 and a service rating of 9.0/10 (according to cleanenergyreviews.com Have a great reputation.

  • Hardware fault
  • Contact error on a ribbon cable, located inside the inverter

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Trouble Shooting Tips

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Below is a list of error and fault readings to help you better understand your solar inverter and aid the quick fix of a fault related to your Fronius IG 15/20/30/40/60 or 60 HV Solar Inverter:

Error and Fault Reading Meaning Solution
Class 1 – Issue In The Public Mains Network And Is Usually Temporary
STATE101 Mains voltage not within admissible range Check mains voltage
STATE104 Mains frequency not within admissible range Check mains frequency
STATE107 AC mains network temporarily unavailable Check mains connections and fuses
STATE108 Islanding detected Contact a licensed electrician
Class 2 – Only Arise In Connection With The ENS Option
STATE201 Excessive mains voltage Check mains voltage
STATE202 Insufficient mains voltage Check mains voltage
STATE203 Excessive mains frequency Check mains frequency
STATE204 Insufficient mains frequency Check mains frequency
STATE205 Imbalance of mains network impedance Can only be short termed
STATE206 Absolute reading of mains impedance too high Check in house line cable cross section
STATE207 Issues with mains relay Check ENS jumper
STATE208 Issues with mains relay Contact a licensed electrician
Class 3 – Occur During Operation Of Feeding Supply
STATE301 Overload current at AC Inverter should repair this problem by itself
STATE302 Overload current at DC Inverter should repair this problem by itself
STATE303 Temperature excursion AC side Inverter should repair this problem by itself
STATE304 Temperature excursion DC side Inverter should repair this problem by itself
Class 4 – Requires Intervention Of Licensed Electrician
STATE401 No internal communication with power stage Contact a licensed electrician
STAT402 No internal communication with ENS Contact a licensed electrician
STATE403 EEPROM faulty Contact a licensed electrician
STATE404 No communication possible between the control unit and ENS Check mains supply
STATE405 Incorrect or faulty ENS card Contact a licensed electrician
STATE406 AC temperature sensor faulty Contact a licensed electrician
STATE407 DC temperature sensor faulty Contact a licensed electrician
STATE408 Direct current input Contact a licensed electrician
STATE409 No +15V supply available for the control electronics Contact a licensed electrician
STATE410 Service plus was not inserted in its original position Contact a licensed electrician
STATE412 The setting voltage has been selected instead of the MPP voltage operation and the setting voltage is set at too low a value Check the module voltage and change the PV generator connection if voltage too high
STATE413 Control problem Contact a licensed electrician
STATE414 EEPROM faulty Contact a licensed electrician
STATE415 No ENS enabling signal Contact a licensed electrician
STATE416 Communication with IG-Ctrl not possible Contact a licensed electrician
STATE417 Two power supplies have the same Print Number Contact a licensed electrician
STATE419 Two or more power supplies recognised with the identical software serial number Contact a licensed electrician
STATE421 Print number set incorrectly Contact a licensed electrician
STATE425 No communication possible with the power supply Contact a licensed electrician
STATE443 Energy transfer not possible Contact a licensed electrician
Class 5 – Does Not Impair The Operation Of Feeding Power Into The Mains Network
STATE501 Defective ventilator Clean air vents
STATE502 Insufficient isolation value reading Check isolation of your photovoltaic system
STATE504 Communication not possible in Local Net Change Fronius IG address
STATE505 EEPROM faulty Inverter should repair this problem by itself
STATE506 EEPROM faulty Inverter should repair this problem by itself
STATE507 EEPROM faulty Inverter should repair this problem by itself
STATE508 IP address faulty Reset address
STATE509 24h no feed Remove snow from solar module
STATE510 EEPROM faulty Reconfigure SMS
STATE511 EEPROM faulty Reconfigure metering channels
STATE512 Too many power supplies in the system Contact a licensed electrician
STATE514 No communication with one of the power stage sets Contact a licensed electrician
STATE515 Faulty plug in connections Check plug in connections
STATE516 Status message present for one of the power stage sets Carry out analysis and contact
STATE517 Change of master has taken place Contact a licensed electrician

Please note that these are general tips only and are based on our current and past experience and therefore, not specific to your solar inverter problem. What we usually find is people trying these troubleshooting tips and if these fail, they give us a call and we can perform diagnostic tests.

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What we usually find is people trying these troubleshooting tips and if these fail, they give us a call and we can perform diagnostic tests and provide a solution.

  • 50% of the time it’s a quick easy fix for any solar tech…
  • Error messages and fault codes that are due to an external fault elsewhere in the solar system.
  • The solar system is tricking the inverter into thinking it has that error or fault.
  • External faults are relatively easy to find and repair. Once fault is repaired, the inverter is back online.
  • Other 50% of the time
  • There is a fault, which requires more diagnostic type of testing to locate the fault. Out of these about 1 in 4 can be solved onsite. Things like a dodgy install or water damage somewhere.
  • The rest of the time it’s the inverter that’s the problem. 1 out of every 2 times the inverter can be sent away for repairs or we can organise those repairs under warranty with the manufacturer, and….
  • The rest of the time the inverter was of low quality and either not fixable of not good value to fix. If this is the case we would quote on an inverter with similar specs to replace it with. Getting your system back online fast with high quality parts.
  • In the worst case scenario, rare ground leakage faults are very difficult to find and fix but we have also had experience locating these as well.
Be careful some dodgy solar guys will just say you need a new inverter without performing any tests just so they can sell you a new inverter that you may not even need!
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Nevertheless, we can help you with any solar problem you may have. Call us on 1300 796 500!

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