Battery cluster SBCU internal bus voltage sampling fault (before applying high voltage)
Critical — the ESS unit shuts down and latches a protection fault. Don't keep restarting it — the cause needs checking first.
Battery cluster SBCU internal bus voltage sampling fault (before applying high voltage)
Cause: Invalid internal bus voltage sampling.
Source: fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
0x20B3 means: Battery cluster SBCU internal bus voltage sampling fault (before applying high voltage). Invalid internal bus voltage sampling.
0x20B3 is a fault code: the ESS unit enters protection and stops normal operation until it is cleared.
Send faults externally, cluster disables insulation detection function with high voltage prohibited. Recovers on normal sampling.
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Compiled from official Felicity user manuals. Always consult your device manual and a qualified technician before performing repairs.