If your Sharp inverter has suddenly stopped working or is displaying a flashing fault code, you’re not alone. These messages are part of the inverter’s self-diagnostic system, helping users and technicians quickly identify performance issues. Whether it’s a grid-related problem, communication error, or internal hardware fault, understanding your Sharp inverter error codes is the first step to restoring system performance.

We’ve put together a full list of Sharp inverter fault codes—including those beginning with F, P, E, and D—to help you interpret exactly what’s going wrong. These range from grid voltage issues like F00 Utility Over Voltage, to more technical faults like E26 DC/DC Converter Abnormal or D40 EEPROM Abnormal.

If your inverter displays any of these errors and you’re unsure what to do next, call Solair Electrical on 0405 685 441. We service and repair Sharp inverters across Brisbane and the surrounding region.

F00 – Utility Over Voltage

Grid voltage is higher than allowed range. May be due to local transformer load or export limits being exceeded.

F01 – Utility Under Voltage

Grid voltage too low. This could point to a wiring issue or problem with the local utility supply.

F02 – Utility Frequency Over

Grid frequency is above normal operating range. Inverter will disconnect as a protective measure.

F03 – Utility Frequency Under

Grid frequency is too low. This can sometimes occur during local grid instability.

F06 – Anti-Islanding: Frequency Over

Inverter has detected conditions suggesting a grid failure and has shut down to prevent islanding.

F07 – Anti-Islanding: Frequency Under

Same as F06 but with frequency dropping below safe levels. Inverter isolates from grid.

F08 – Utility Synchronisation Loss

Inverter failed to synchronise with grid. Likely temporary, but if persistent, needs inspection.

F09 – Frequency Abnormal (50/60Hz)

Grid frequency is out of expected international standards. Check settings or grid stability.

P11 – Solar Panel Array Over Voltage

DC voltage input exceeds safe range (>320V). May indicate too many panels in series. Switch off inverter immediately and call a technician.

E15 / D15 – Relay Sticking

The relay failed to open/close correctly. Could be a hardware fault—requires internal inspection.

E16 / D16 – Communication Error

Inverter unable to communicate internally between components. May require firmware reset or board replacement.

E17 / D17 – Auxiliary Power Abnormal

A fault in the inverter’s low-voltage auxiliary power circuit. Inverter likely won’t start.

E18 – Ground Fault

Leakage current detected between PV array and earth. Critical safety issue—shut down system and call for service.

D20 – Temperature Sensor Broken

Inverter cannot monitor internal temperature. Cooling may not be functioning correctly—can lead to overheating.

E21 / D21 – Output Over Current

Too much current on the AC output side. Could be caused by short circuit, loose wiring, or relay damage.

E22 / D22 – DC Offset Over Rating

Too much DC is being injected into the grid—this is a safety protection and must be addressed.

E23 / D23 – Fin High Temperature

The inverter’s cooling fins are too hot. Check airflow around the inverter and ensure it is not exposed to direct sunlight or blockages.

E26 / D26 – DC/DC Converter Abnormal

DC converter board failure. This is a critical component and likely requires repair or replacement.

E27 / D27 – Relay Open

Relay is not engaging correctly to allow power export. Often due to physical relay wear or corrosion.

E28 – DC Bus Voltage Abnormal

Internal DC bus voltage is outside of normal limits. May indicate capacitor issues or board failure.

D40 – EEPROM Abnormal

Non-volatile memory malfunction. This could affect settings and inverter memory. Often requires firmware re initialisation or replacement.

Need Help with Sharp Inverter Fault Codes? Call Solair Electrical

Most Sharp inverter error codes are meant to protect your system from damage, but they’re not always easy to interpret—and even harder to fix without the right tools or experience. Don’t risk further downtime or system damage.

At Solair Electrical, we specialise in inverter diagnosis and solar fault repairs. If your Sharp inverter is showing a code or has shut down, we’ll come out, assess the issue, and get you back online—fast.

Call us now on 0405 685 441 to book an inspection anywhere in Brisbane, Redlands, or the Gold Coast. Let the experts handle your inverter problems so you can get back to saving on power.