If your JFY inverter (also branded as 5 Star Energy) is showing a fault or has shut down, you're likely seeing one of many JFY inverter error codes. These messages are designed to alert you to specific issues—ranging from grid problems and internal hardware faults to insulation errors and overvoltage warnings.

Whether you're seeing W01 No Grid, E02 Leak Error, or E13 DC Sensor Fault, it's important to understand what each code means so you can take the right steps toward a fix. We've listed all known JFY inverter fault codes below—organised by category—so you can quickly identify and act on any problem.

Need help? Call Solair Electrical on 0405 685 441 to book a fast and professional inverter inspection across Brisbane, the Gold Coast, and beyond.

No Display on LCD or LED

• Cause: No power or poor PV input connection.
• Solution: Check PV input terminals and DC isolator. If there's still no display, your inverter may require servicing.

JFY Inverter Warning Codes (W-Series)

W01 – No Grid

Grid is not detected by the inverter.
Solution: Check AC isolator, grid wiring, and main switchboard connections. Contact your installer if unresolved.

W02 – Vin Over Voltage

PV input voltage exceeds the inverter’s rated capacity.
Solution: Check the Voc (open circuit voltage) of the panel string. Disconnect immediately and consult an expert.

JFY Inverter Error Codes (E-Series)

E01 – Isolation Error

Insulation resistance between PV+ and PV- is too low.
Solution: Disconnect the PV array and test impedance. Check for damaged cables or moisture in connections.

E02 – Leak Error

Leakage current too high—possible ground fault.
Solution: Turn off PV input and inspect system insulation and AC wiring. Requires GFCI inspection.

E03 – Grid Fault

Grid voltage or frequency is outside of safe operating limits.
Solution: Check the utility supply. This may be a temporary grid issue or indicate a wiring fault.

JFY System Fault Messages

Auto Test Failed

Inverter did not pass its automatic internal diagnostic test.
Solution: Restart inverter. If fault returns, the unit may require firmware update or servicing.

(Also see W01, W02, E01, E02, and E03 above—these repeat under both categories depending on context.)

JFY Inverter Internal Faults

E04 – Coherence Error

Master and slave processors have inconsistent data.
Solution: Requires inverter shutdown and restart. If error persists, contact a technician.

E05 – Over Temperature

Inverter internal temperature too high.
Solution: Ensure inverter is shaded, clean, and well-ventilated. If conditions are fine and error persists, service is required.

E06 – Relay Failure

Internal relay is not operating correctly.
Solution: Safety risk—disconnect system and request immediate service.

E07 – DC Injection Failure

Excessive DC being pushed into AC grid.
Solution: Shut down inverter and contact a licensed solar electrician.

E08 – EEPROM Failure

Internal memory malfunction.
Solution: Can affect inverter settings. Restart the unit. If unresolved, EEPROM may need replacement.

E09 – Communication Failure

Inverter cannot communicate internally between control boards.
Solution: Restart inverter. If issue continues, it may need board repair or firmware reflash.

E10 – DC Bus Over Voltage

The internal DC bus voltage is too high.
Solution: Check PV input array sizing. May indicate capacitor damage.

E11 – DC Bus Under Voltage

DC bus voltage too low for safe operation.
Solution: Could point to a faulty DC capacitor or insufficient input voltage.

E12 – VRef Error

The 2.5V reference voltage has failed.
Solution: Internal power regulation fault—requires service.

E13 – DC Sensor Fault

DC current sensor malfunction.
Solution: This impacts safety and monitoring accuracy. Needs inspection.

E14 – GFCI Failure

Ground fault current interrupter failure.
Solution: The GFCI device is damaged or faulty. Immediate servicing required.

Need Help with JFY Inverter Fault Codes? Call Solair Electrical

Whether your inverter is showing a warning like W02 Vin Over Voltage, or a critical shutdown error like E14 GFCI Failure, don’t take risks with your solar system. These faults could affect energy production, safety, or even cause permanent inverter damage.

At Solair Electrical, we’re qualified to inspect and repair all types of JFY inverters. We service customers across Brisbane, Redlands, Logan, and the Gold Coast—and we know how to get your solar system back online quickly and safely.

Call us now on 0405 685 441 to book an expert inverter inspection and fault diagnosis. Fast, local, and reliable.