What does error PCS-ARM-16 mean on a Felicity ESS?

PCS-ARM-16 means: ARM software fault - DC polarity reverse connection. DC terminals connected with reversed polarity.

Is error PCS-ARM-16 a fault or a warning?

PCS-ARM-16 is a warning: the unit keeps running. Fix the underlying condition before it escalates.

PCS shall be automatically reset and restarted after the fault is rectified on the site. Check the voltage polarity of the PCS DC terminal.

PCS-ARM-16

ARM software fault - DC polarity reverse connection

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

Energy storage systemWarning

ARM software fault - DC polarity reverse connection

Cause: DC terminals connected with reversed polarity.

PCS shall be automatically reset and restarted after the fault is rectified on the site.
Check the voltage polarity of the PCS DC terminal.

Source: FLS-ES232LC-S.pdf

What does error PCS-ARM-16 mean on a Felicity ESS?: PCS-ARM-16 means: ARM software fault - DC polarity reverse connection. DC terminals connected with reversed polarity.
Is error PCS-ARM-16 a fault or a warning?: PCS-ARM-16 is a warning: the unit keeps running. Fix the underlying condition before it escalates.
How do I clear or fix error PCS-ARM-16?: PCS shall be automatically reset and restarted after the fault is rectified on the site. Check the voltage polarity of the PCS DC terminal.

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