Is error 0x40F2 a fault or a warning?

0x40F2 is a fault code: the ESS unit enters protection and stops normal operation until it is cleared.

0x40F2

Felicity ESS error 0x40F2

Failure to disconnect the main positive circuit relay in the battery cluster high-voltage box

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

Energy storage systemCritical

Failure to disconnect the main positive circuit relay in the battery cluster high-voltage box

Cause: Sticking failure - main positive relay cannot open.

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 0x40F2 mean on a Felicity ESS?: 0x40F2 means: Failure to disconnect the main positive circuit relay in the battery cluster high-voltage box. Sticking failure - main positive relay cannot open.
Is error 0x40F2 a fault or a warning?: 0x40F2 is a fault code: the ESS unit enters protection and stops normal operation until it is cleared.
How do I clear or fix error 0x40F2?: 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.