What does error PCS-ARM-53 mean on a Felicity ESS?

PCS-ARM-53 means: ARM software fault - busbar semi-direct voltage overvoltage. Half-bus voltage overvoltage.

Is error PCS-ARM-53 a fault or a warning?

PCS-ARM-53 is a warning: the unit keeps running. Fix the underlying condition before it escalates.

Reset to restart. Measure battery voltage; check contactor and DC fuse.

PCS-ARM-53

ARM software fault - busbar semi-direct voltage overvoltage

Warning — a protection warning — the ESS unit keeps running, but deal with the cause before it escalates.

Energy storage systemWarning

ARM software fault - busbar semi-direct voltage overvoltage

Cause: Half-bus voltage overvoltage.

Source: FLS-ES232LC-S.pdf

What does error PCS-ARM-53 mean on a Felicity ESS?: PCS-ARM-53 means: ARM software fault - busbar semi-direct voltage overvoltage. Half-bus voltage overvoltage.
Is error PCS-ARM-53 a fault or a warning?: PCS-ARM-53 is a warning: the unit keeps running. Fix the underlying condition before it escalates.
How do I clear or fix error PCS-ARM-53?: Reset to restart. Measure battery voltage; check contactor and DC fuse.

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