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JFY JSI Suntwins Inverter Error Codes

by | Feb 11, 2021

Do you have a JSI or Suntwins Solar Inverter?

jfy inverterIf you do, it is very likely it is over 5 years old and out of warranty.  However, if it is less than 5 years old you still don’t have warranty from JFY, the manufacturer, as they are no longer trading in Australia.

We have never installed JFY inverters, however we have replaced a lot which have stopped working, so we can help you with this.

Call us today on 1300 130 546 for assistance.

Firstly, look up the error code you are getting on the inverter:


W01 No GridCheck the AC switch under the inverter and in the switchboard are on
W02 Vin OvervoltageVoltage from panels is too high (unlikely to see this)
E01 Isolation ErrorWater or moisture somewhere in your system
E02 Ileak ErrorGround fault, again probably water or moisture somewhere
E03 Grid FaultGrid Voltage/Frequency is out of range (should correct itself)
E04 Coherence ErrorBroken
E05 Over TemperatureBroken
E06 Relay FailureBroken
E07 DC inj FailureBroken
E08 EEPROM FailureBroken
E09 Com FailureBroken
E10 DC Bus OVBroken
E11 DC Bus UVBroken
E12 Vref ErrorBroken
E13 DC Sensor FaultBroken
E14 GFCI FailureBroken

It is always worth trying a reboot of your inverter, as sometimes this may clear a fault, however generally once they start having intermittent faults, they end up permanent.  To see how best to reboot, check here

Any of the system faults may mean an external issue, or it may be the inverter.  All Inverter faults are definitely the inverter and not repairable.


Beware of your JSI or Suntwins looking like it is working (green light), but making no power (PAC=0).  Make sure you are checking when the sun is out – this is broken, and it will not recover.


If your JFY JSI or Suntwins inverter has stopped working call us today so we can get your solar back working again.

Call us today on 1300 130 546