What does error W54~65 mean on a Felicity inverter?

W54~65 means: BMS detect something wrongs happened. BMS has detected an internal abnormality.

Is error W54~65 a fault or a warning?

W54~65 is a warning: the red LED flashes and the unit keeps running. Fix the underlying condition before it escalates.

If the code is keeping for long time, please contact with your installer. The exact steps for each affected model are listed on this page.

W54~65

BMS detect something wrongs happened

Warning — the red LED flashes and the inverter keeps running. Deal with it before it escalates.

It means the same on every affected model — find yours for the exact fix:

InverterWarning

Also applies to:IVEM6048

BMS detect something wrongs happened — Warning: BMS detect something wrongs happened (range covering codes 54 through 65).

Cause: BMS has detected an internal abnormality.

If the code is keeping for long time, please contact with your installer.

Source: felicitysolar IVEM 6048 Solar Inverter User Guide.pdf, p.36

InverterWarning

Also applies to:IVEM8048

BMS detect something wrongs happened — BMS detect something wrongs happened (range of codes 54 through 65).

Cause: BMS has detected an internal fault.

If the code is keeping for long time, please contact with your installer.

Source: FelicitySolar IVEM8048-LV Single Phase Hybrid Inverter User Guide.pdf, p.37

What does error W54~65 mean on a Felicity inverter?: W54~65 means: BMS detect something wrongs happened. BMS has detected an internal abnormality.
Is error W54~65 a fault or a warning?: W54~65 is a warning: the red LED flashes and the unit keeps running. Fix the underlying condition before it escalates.
How do I clear or fix error W54~65?: If the code is keeping for long time, please contact with your installer. The exact steps for each affected model are listed on this page.

Compiled from official Felicity user manuals. Always consult your device manual and a qualified technician before performing repairs.