Input overvoltage

Optimizer input overvoltage occurred.

Check whether the open-circuit voltage of the PV module exceeds the maximum input voltage of the optimizer.

Overtemperature

The optimizer internal temperature is too high.

1. Check the ventilation and ambient temperature at the optimizer installation position. If the ventilation is poor or the ambient temperature exceeds the upper threshold, improve the ventilation and heat dissipation.
2. If the ventilation and ambient temperature are normal, contact the installation contractor.

Internal hardware fault

An internal fault occurred in an optimizer.

Contact the installation contractor.

Output backfeed

Optimizer output backfeed occurred.

1. Check whether PV modules are severely blocked when PV strings are connected in parallel.
2. If the fault persists, contact the installation contractor.

Abnormal output voltage

The optimizer output voltage is abnormal.

1. When the sunlight is normal, perform optimizer search again.
2. Use an extension cable for the optimizer output, prepare new terminals, and connect the extension cable to the positive connector at one end and to the negative connector at the other end.
3. Check whether the PV string is correctly connected to the inverter or whether there is a breakpoint in the PV string.
4. If the fault persists, contact the installation contractor.

Upgrade failed

The optimizer software upgrade failed.

1. When the sunlight is normal, perform the optimizer upgrade again.
2. If the fault persists, contact the installation contractor.

Output terminal overtemperature

The temperature of the optimizer output terminal is abnormal.

Contact the installer to replace the faulty optimizer and the optimizer connected to the short output cable of the faulty optimizer.