Porsche EV home charger makes a loud humming or buzzing noise during charging.

Safety first: Turn off power at the breaker before touching the unit or opening the cover.

• Check mounting: Ensure the Porsche wallbox is firmly mounted to a solid wall. Tighten mounting screws if the housing vibrates when touched.
• Listen for source: Carefully identify whether the noise comes from the contactor area or another component. A brief click at start is normal; continuous loud buzzing is not.
• Technician internal check: A technician should inspect the main contactor for loose mounting screws, tighten them, and check for signs of wear. They should also verify that all power terminals are properly torqued.
• Replace noisy component: If the contactor or transformer continues to buzz excessively despite secure mounting, replace the affected component with a Porsche-approved part.