JFY SunTwins Solar Inverter has a dual-string series of inverters which aims to provide a much better experience.
However there are several factors that may affect an inverter’s performance and cause failures, hence we have put together a list of fault displays and possible action from JFY Suntwins user manual for your convenience.
If any problems arise, the “Alarm” LED on the front panel will be red and the LCD displays the relevant information. Please note that safety measures should be observed to avoid any risk of injury or you may also seek assistance from a qualified electrician.
DISPLAY | COMMENTS |
| No any display in LCD or LED | Check PV-input connections |
| W01 No grid | Check grid connection cables. |
| W02 Vin overvoltage | Check the Voc of PV string, see if it is greater than or too close to max. input DC voltage of relative inverter type. |
| E01 Isolation error | Check the impedance is between PV (+) & PV (-) and the PV-Inverter is earthed. The impedance must be greater than 2MΩ |
| E02 Leak error | The leakage current is too high. Unplug the inputs from the PV string and check the peripheral AC system. |
| E03 Grid fault | Make sure grid voltage and frequency meet the specifications. |
Please note that during periods of little or no sunlight, the JFY JSI Solar Inverter may continuously start up and shut down. This is due to the insufficient power generated to operate the control circuits but this is not a trouble.
Here are some more fault messages that you may see on the JFY JSI front panel display.
| FAULT | DISPLAY | COMMENTS |
| System fault | Auto Test Failed | Auto Test does not pass |
| W01 No grid | No Utility, No Grid Connect | |
| W02 Vin overvoltage | PV panel Voltage is too high | |
| E01 Isolation error | Insulation Problem of PV panel | |
| E02 Ileak error | GFCI Fault, leakage current is too high | |
| E03 Grid fault | Grid voltage/frequency is out of range | |
| Inverter fault | E04 Coherence error | Consistent Fault |
| E05 Over temperature | Internal temperature abnormal | |
| E06 Relay failure | Output relay Fault | |
| E07 DCinj failure | Output Current DC Offset too high | |
| E08 EEPROM failure | EEPROM Fault | |
| E09 Com. failure | Communication Fault | |
| E10 DC bus OV. | DC Bus over-voltage | |
| E11 DC bus UV. | DC Bus under-voltage | |
| E12 Vref error | 2.5V Reference Voltage Fault | |
| E13 DC sensor fault | DC current sensor fault | |
| E14 GFCI failure | GFCI Device is damaged |
The full details are available in the JFY JSI solar inverter manual’s troubleshooting section.
If following the steps above does not fix the issue and your JFY JSI Solar Inverter is still within the warranty period you can contact the equipment installer or supplier. If your inverter is outside the warranty period we suggest that you contact a professional solar power expert. If you’re on the Gold Coast or Brisbane area contact Gold Coast Power Solutions here and we will be in touch to provide you with further assistance.
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