The Biesse Rower 316‑RT480 board is the main control unit for a Rover CNC system, integrating a PLC, motor drives and operator interface. Common failures include loss of stored data when the controller’s backup battery dies, leading to a reset state with blank monitor displays and error code 3; power supply spikes or degraded voltage regulators can also trigger intermittent resets or communication faults. First‑check diagnostics: verify the integrity of the backup battery and main AC/DC supply, inspect all connector pins for corrosion or loose contacts, and review the controller’s diagnostic log for error codes (e.g., code 3) to isolate whether the issue is power‑related or a hardware fault in the CNi module.[oss-gpt-20b]