Safety first: Turn OFF power before opening the charger. Do not touch internal components when energized.

1. Identify noise source: With the cover on, listen carefully to locate the general area of the noise (top, bottom, left, right).
2. Internal inspection (qualified): With power OFF, open the charger and check that the main contactor and any transformers/inductors are firmly mounted. Tighten mounting screws.
3. Check for relay chatter: If the noise is a rapid clicking, the relay coil may be undervoltage or failing. Inspect the relay and replace if necessary.
4. Line voltage check: Have an electrician verify that the supply voltage is within spec and balanced; severe imbalance can increase hum.
5. Replace noisy component: If a specific transformer or contactor is excessively noisy even when tight, replace it with the correct Besenergy part.

When to call a professional: For internal component replacement, contact a qualified technician.

Charger makes a loud buzzing or humming noise during operation.

Possible Causes