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 ReadingMeaningSolution
Class 1 – Issue In The Public Mains Network And Is Usually Temporary
STATE101Mains voltage not within admissible rangeCheck mains voltage
STATE104Mains frequency not within admissible rangeCheck mains frequency
STATE107AC mains network temporarily unavailableCheck mains connections and fuses
STATE108Islanding detectedContact a licensed electrician
Class 2 – Only Arise In Connection With The ENS Option
STATE201Excessive mains voltageCheck mains voltage
STATE202Insufficient mains voltageCheck mains voltage
STATE203Excessive mains frequencyCheck mains frequency
STATE204Insufficient mains frequencyCheck mains frequency
STATE205Imbalance of mains network impedanceCan only be short termed
STATE206Absolute reading of mains impedance too highCheck in house line cable cross section
STATE207Issues with mains relayCheck ENS jumper
STATE208Issues with mains relayContact a licensed electrician
Class 3 – Occur During Operation Of Feeding Supply
STATE301Overload current at ACInverter should repair this problem by itself
STATE302Overload current at DCInverter should repair this problem by itself
STATE303Temperature excursion AC sideInverter should repair this problem by itself
STATE304Temperature excursion DC sideInverter should repair this problem by itself
Class 4 – Requires Intervention Of Licensed Electrician
STATE401No internal communication with power stageContact a licensed electrician
STAT402No internal communication with ENSContact a licensed electrician
STATE403EEPROM faultyContact a licensed electrician
STATE404No communication possible between the control unit and ENSCheck mains supply
STATE405Incorrect or faulty ENS cardContact a licensed electrician
STATE406AC temperature sensor faultyContact a licensed electrician
STATE407DC temperature sensor faultyContact a licensed electrician
STATE408Direct current inputContact a licensed electrician
STATE409No +15V supply available for the control electronicsContact a licensed electrician
STATE410Service plus was not inserted in its original positionContact a licensed electrician
STATE412The setting voltage has been selected instead of the MPP voltage operation and the setting voltage is set at too low a valueCheck the module voltage and change the PV generator connection if voltage too high
STATE413Control problemContact a licensed electrician
STATE414EEPROM faultyContact a licensed electrician
STATE415No ENS enabling signalContact a licensed electrician
STATE416Communication with IG-Ctrl not possibleContact a licensed electrician
STATE417Two power supplies have the same Print NumberContact a licensed electrician
STATE419Two or more power supplies recognised with the identical software serial numberContact a licensed electrician
STATE421Print number set incorrectlyContact a licensed electrician
STATE425No communication possible with the power supplyContact a licensed electrician
STATE443Energy transfer not possibleContact a licensed electrician
Class 5 – Does Not Impair The Operation Of Feeding Power Into The Mains Network
STATE501Defective ventilatorClean air vents
STATE502Insufficient isolation value readingCheck isolation of your photovoltaic system
STATE504Communication not possible in Local NetChange Fronius IG address
STATE505EEPROM faultyInverter should repair this problem by itself
STATE506EEPROM faultyInverter should repair this problem by itself
STATE507EEPROM faultyInverter should repair this problem by itself
STATE508IP address faultyReset address
STATE50924h no feedRemove snow from solar module
STATE510EEPROM faultyReconfigure SMS
STATE511EEPROM faultyReconfigure metering channels
STATE512Too many power supplies in the systemContact a licensed electrician
STATE514No communication with one of the power stage setsContact a licensed electrician
STATE515Faulty plug in connectionsCheck plug in connections
STATE516Status message present for one of the power stage setsCarry out analysis and contact
STATE517Change of master has taken placeContact 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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