What does error 0x1043 mean on a Felicity ESS?

0x1043 means: Battery cluster cell undervoltage alarm (level 3). Cell voltage < 2,300 mV.

Is error 0x1043 a fault or a warning?

0x1043 is a fault code: the ESS unit enters protection and stops normal operation until it is cleared.

Send faults externally, limit power and request lower high voltage; immediately cut off the main circuit relay. Recovers when > 2,400 mV.

0x1043

0x1043 is a fault code: the ESS unit enters protection and stops normal operation until it is cleared.

Send faults externally, limit power and request lower high voltage; immediately cut off the main circuit relay. Recovers when > 2,400 mV.

Battery cluster cell undervoltage alarm (level 3)

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 cell undervoltage alarm (level 3)

Cause: Cell voltage < 2,300 mV.

Send faults externally, limit power and request lower high voltage; immediately cut off the main circuit relay.
Recovers when > 2,400 mV.

Source: FLS-ES232LC-S.pdf

What does error 0x1043 mean on a Felicity ESS?: 0x1043 means: Battery cluster cell undervoltage alarm (level 3). Cell voltage < 2,300 mV.
Is error 0x1043 a fault or a warning?: 0x1043 is a fault code: the ESS unit enters protection and stops normal operation until it is cleared.
How do I clear or fix error 0x1043?: Send faults externally, limit power and request lower high voltage; immediately cut off the main circuit relay. Recovers when > 2,400 mV.

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