What does error 0x9022 mean on a Felicity ESS?

0x9022 means: Fuse (FU1) in the battery cluster high-voltage box is disconnected. FU1 feedback signal anomaly detected inside SBCU.

Is error 0x9022 a fault or a warning?

0x9022 is a fault code: the ESS unit enters protection and stops normal operation until it is cleared.

0x9022

Fuse (FU1) in the battery cluster high-voltage box is disconnected

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

Energy storage systemCritical

Fuse (FU1) in the battery cluster high-voltage box is disconnected

Cause: FU1 feedback signal anomaly detected inside SBCU.

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 0x9022 mean on a Felicity ESS?: 0x9022 means: Fuse (FU1) in the battery cluster high-voltage box is disconnected. FU1 feedback signal anomaly detected inside SBCU.
Is error 0x9022 a fault or a warning?: 0x9022 is a fault code: the ESS unit enters protection and stops normal operation until it is cleared.
How do I clear or fix error 0x9022?: 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.