Excessive temperature in the high-voltage box of the battery cluster
Critical — the ESS unit shuts down and latches a protection fault. Don't keep restarting it — the cause needs checking first.
Excessive temperature in the high-voltage box of the battery cluster
Cause: SBCU detects BJB_NTC > 60°C.
Source: fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
0x9052 means: Excessive temperature in the high-voltage box of the battery cluster. SBCU detects BJB_NTC > 60°C.
0x9052 is a fault code: the ESS unit enters protection and stops normal operation until it is cleared.
Send faults externally, limit power, request lower high voltage; if command not received within 5s, cut off the main circuit relay. Recovers when BJB_NTC < 50°C.
Prefer the full written guide? Read the complete Felicity inverter error-code guide
Compiled from official Felicity user manuals. Always consult your device manual and a qualified technician before performing repairs.