Fault Phenomenon: Genie GS-4069 HC scissor lift aerial work platform hybrid battery alarms, cannot switch to electric mode.

Troubleshooting Process:
– Checked battery cells: cell voltages imbalanced.
– Checked BMS: BMS fault.
– Checked charger: charger fault.
– Checked wiring: wiring open circuit.

Root Cause: The hybrid battery pack BMS is faulty or a cell is damaged.

Required Parts: BMS module or battery cell.