Battery cluster SBCU external bus voltage sampling fault
Critical — the ESS unit shuts down and latches a protection fault. Don't keep restarting it — the cause needs checking first.
Battery cluster SBCU external bus voltage sampling fault
Cause: Invalid external bus voltage sampling.
Send faults externally, limit power and request to lower high voltage; if command not received within 5s, cut off the main circuit relay.
Source: fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
0x20C3 means: Battery cluster SBCU external bus voltage sampling fault. Invalid external bus voltage sampling.
0x20C3 is a fault code: the ESS unit enters protection and stops normal operation until it is cleared.
Send faults externally, limit power and request to lower high voltage; if command not received within 5s, cut off the main circuit relay.
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Compiled from official Felicity user manuals. Always consult your device manual and a qualified technician before performing repairs.