What does error 0x1103 mean on a Felicity ESS?

0x1103 means: Battery cluster voltage mismatch fault. |Slave plate voltage sum - internal bus voltage| > 40V.

Is error 0x1103 a fault or a warning?

0x1103 is a fault code: the ESS unit enters protection and stops normal operation until it is cleared.

0x1103

Battery cluster voltage mismatch fault

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

Energy storage systemCritical

Battery cluster voltage mismatch fault

Cause: |Slave plate voltage sum - internal bus voltage| > 40V.

Send faults externally, 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 0x1103 mean on a Felicity ESS?: 0x1103 means: Battery cluster voltage mismatch fault. |Slave plate voltage sum - internal bus voltage| > 40V.
Is error 0x1103 a fault or a warning?: 0x1103 is a fault code: the ESS unit enters protection and stops normal operation until it is cleared.
How do I clear or fix error 0x1103?: Send faults externally, 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.