Charger front panel or enclosure vibrates noticeably when contactor pulls in.

Safety first: Isolate power before tightening any hardware.

• Check mounting: Ensure all wall screws are tight and that appropriate wall plugs are used for the surface.
• Secure backplate: Confirm that the internal backplate is firmly attached to the enclosure.
• Inspect contactor mounting: With power OFF, press the contactor onto the DIN rail until it clicks and tighten any retaining screws.
• Isolate from other structures: Ensure conduits or pipes are not transmitting vibration; add supports or padding if necessary.