What does error 0x2163 mean on a Felicity ESS?

0x2163 means: PCS communication loss. No signal received or life signal unchanged from PCS.

Is error 0x2163 a fault or a warning?

0x2163 is a fault code: the ESS unit enters protection and stops normal operation until it is cleared.

0x2163

PCS communication loss

Critical — the ESS unit shuts down and latches a protection fault. Don't keep restarting it — the cause needs checking first.

Energy storage systemCritical

PCS communication loss

Cause: No signal received or life signal unchanged from PCS.

Send faults to EMS, limit power, request lower high voltage; if command not received within 5s, cut off the main circuit relay.

Source: FLS-ES232LC-S.pdf

What does error 0x2163 mean on a Felicity ESS?: 0x2163 means: PCS communication loss. No signal received or life signal unchanged from PCS.
Is error 0x2163 a fault or a warning?: 0x2163 is a fault code: the ESS unit enters protection and stops normal operation until it is cleared.
How do I clear or fix error 0x2163?: Send faults to EMS, limit power, request lower high voltage; if command not received within 5s, cut off the main circuit relay.

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