Ohme charger emits a loud humming or buzzing noise during charging.

Safety: Mechanical noise alone is not always dangerous, but sudden changes in sound can indicate a developing fault.

• 1. Compare with normal: Some faint clicking and low hum is normal. If the noise is significantly louder than before, note when it occurs (only when charging, or all the time).
• 2. Check mounting: Ensure the charger is firmly fixed to the wall and not vibrating against loose cladding or pipework.
• 3. Listen for arcing: Crackling or popping sounds are not normal and indicate arcing—immediately stop using the charger and isolate power.
• 4. Technician inspection: A technician can open the unit, tighten contactor mounting, check for coil buzz due to low voltage, and replace the contactor or power supply module if necessary.