JFY error codes explained

What 16 JFY inverter fault and error codes mean, in plain English, with safe checks you can do and when to call a licensed electrician.

Safety first: never open the switchboard, remove covers, or pull apart or disconnect the inverter, batteries, isolators or wiring. Only use the switches and buttons described here. Anything else must be done by a licensed electrician. Call 1300 209 503 or book a service request.

Guide only. This information is a general guide taken from manufacturer documentation. All electrical work must be performed by a licensed electrician. Never open your inverter, battery or switchboard. If you see smoke, smell burning or see damage, keep clear and call 000.

Code	Message & meaning	Model	Type
W01Info	No grid No Utility, No Grid Connect What you can do Check whether the rest of your house or street has power, and check your network operator's outage map Check the switchboard for a tripped solar/inverter breaker - reset it once only; if it trips again, leave it off and call an electrician Once normal power is back the inverter usually reconnects on its own within a few minutes If the power is normal but the alarm stays, call your installer SunTwins grid-tie inverter · Guide only. All work must be done by a licensed electrician.	SunTwins grid-tie inverter	Inverter
W02Fault	Vin overvoltage PV panel Voltage is too high What you can do Check solar generation in the app compared with similar days Do not touch the DC isolators, cables or connectors, and don't go on the roof If it doesn't clear by itself, call your installer SunTwins grid-tie inverter · Guide only. All work must be done by a licensed electrician.	SunTwins grid-tie inverter	Inverter
E01Safety-Critical	Isolation error Insulation Problem of PV panel What you can do Do not touch the panels, rooftop isolators or DC cables Note the code and whether it appears in wet weather or early morning - this helps the electrician If it clears by itself once things dry out, still let us know if it keeps returning Call a licensed electrician or Total Solar - insulation and earth faults need testing with proper equipment SunTwins grid-tie inverter · Guide only. All work must be done by a licensed electrician.	SunTwins grid-tie inverter	Inverter
E02Safety-Critical	Ileak error GFCI Fault, leakage current is too high What you can do Keep clear and do not touch the inverter or cabling Note the code, date and time Call a licensed electrician or Total Solar - this alarm means current may be leaking to earth SunTwins grid-tie inverter · Guide only. All work must be done by a licensed electrician.	SunTwins grid-tie inverter	Inverter
E03Warning	Grid fault Grid voltage/frequency is out of range What you can do This is usually caused by the mains supply, not the solar system The inverter normally reconnects by itself once grid voltage is back in range If it happens often (especially on sunny afternoons), note the times and call your installer - they can check the voltage and settings and talk to the network if needed SunTwins grid-tie inverter · Guide only. All work must be done by a licensed electrician.	SunTwins grid-tie inverter	Inverter
E04Fault	Coherence error Consistent Fault What you can do Note the code, date and time and check the monitoring app Restart the system once using the owner shutdown/start-up steps in your manual if it allows If it comes back, call your installer SunTwins grid-tie inverter · Guide only. All work must be done by a licensed electrician.	SunTwins grid-tie inverter	Inverter
E05Warning	Over temperature Internal temperature abnormal What you can do Check from a safe distance that the inverter is shaded, has clear space around it and that nothing is blocking the vents It usually recovers once it cools down If it repeats often or you can hear a noisy/failed fan, call your installer SunTwins grid-tie inverter · Guide only. All work must be done by a licensed electrician.	SunTwins grid-tie inverter	Inverter
E06Fault	Relay failure Output relay Fault What you can do Note the code, then restart the system once using the owner shutdown/start-up steps in your manual If the code comes back, call your installer - this is an internal fault that needs a licensed electrician or the manufacturer SunTwins grid-tie inverter · Guide only. All work must be done by a licensed electrician.	SunTwins grid-tie inverter	Inverter
E07Fault	DCinj failure Output Current DC Offset too high What you can do Restart the system once using the owner shutdown/start-up steps in your manual If it comes back, call your installer SunTwins grid-tie inverter · Guide only. All work must be done by a licensed electrician.	SunTwins grid-tie inverter	Inverter
E08Fault	EEPROM failure EEPROM Fault What you can do Note the code, then restart the system once using the owner shutdown/start-up steps in your manual If the code comes back, call your installer - this is an internal fault that needs a licensed electrician or the manufacturer SunTwins grid-tie inverter · Guide only. All work must be done by a licensed electrician.	SunTwins grid-tie inverter	Inverter
E09Warning	Com. failure Communication Fault What you can do Check that your home Wi-Fi/internet is working and restart your router Wait an hour - monitoring often reconnects by itself If the inverter screen also shows a fault, or the alarm stays for more than a day, call your installer SunTwins grid-tie inverter · Guide only. All work must be done by a licensed electrician.	SunTwins grid-tie inverter	Inverter
E10Fault	DC bus OV. DC Bus over-voltage What you can do Do not touch the DC isolators or cables Note the time - this often shows on cold, very sunny mornings Call your installer - the panel strings may need to be checked against the inverter's limits SunTwins grid-tie inverter · Guide only. All work must be done by a licensed electrician.	SunTwins grid-tie inverter	Inverter
E11Fault	DC bus UV. DC Bus under-voltage What you can do Note the code, then restart the system once using the owner shutdown/start-up steps in your manual If the code comes back, call your installer - this is an internal fault that needs a licensed electrician or the manufacturer SunTwins grid-tie inverter · Guide only. All work must be done by a licensed electrician.	SunTwins grid-tie inverter	Inverter
E12Fault	Vref error 2.5V Reference Voltage Fault What you can do Note the code, date and time and check the monitoring app Restart the system once using the owner shutdown/start-up steps in your manual if it allows If it comes back, call your installer SunTwins grid-tie inverter · Guide only. All work must be done by a licensed electrician.	SunTwins grid-tie inverter	Inverter
E13Fault	DC sensor fault DC current sensor fault What you can do Note the code, then restart the system once using the owner shutdown/start-up steps in your manual If the code comes back, call your installer - this is an internal fault that needs a licensed electrician or the manufacturer SunTwins grid-tie inverter · Guide only. All work must be done by a licensed electrician.	SunTwins grid-tie inverter	Inverter
E14Safety-Critical	GFCI failure GFCI Device is damaged What you can do Keep clear and do not touch the inverter or cabling Note the code, date and time Call a licensed electrician or Total Solar - this alarm means current may be leaking to earth SunTwins grid-tie inverter · Guide only. All work must be done by a licensed electrician.	SunTwins grid-tie inverter	Inverter

Common JFY questions

What does JFY W02 "Vin overvoltage" mean?

PV panel Voltage is too high Check solar generation in the app compared with similar days This is a guide only; any electrical work must be done by a licensed electrician.

What does JFY E04 "Coherence error" mean?

Consistent Fault Note the code, date and time and check the monitoring app This is a guide only; any electrical work must be done by a licensed electrician.

What does JFY E06 "Relay failure" mean?

Output relay Fault Note the code, then restart the system once using the owner shutdown/start-up steps in your manual This is a guide only; any electrical work must be done by a licensed electrician.

What does JFY E07 "DCinj failure" mean?

Output Current DC Offset too high Restart the system once using the owner shutdown/start-up steps in your manual This is a guide only; any electrical work must be done by a licensed electrician.

What does JFY E08 "EEPROM failure" mean?

EEPROM Fault Note the code, then restart the system once using the owner shutdown/start-up steps in your manual This is a guide only; any electrical work must be done by a licensed electrician.

Need help with this fault?

Get a licensed electrician to call you back.

Total Solar can help: our licensed electricians install and service systems. Based in Ellenbrook, WA, with Victoria and Queensland also available.

Or call 1300 209 503

Sources

Meanings are summarised from these manufacturer documents. Check your own model's manual, as codes vary between models and firmware versions.

JFY SunTwins Installation and Operator's Manual, error display table

JFY is a trademark of its owner. Total Solar is not affiliated with the manufacturer unless stated. All fault code guides

Common JFY questions

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