Charger makes loud buzzing or humming noises during operation.

Safety first: Unusual noises can indicate impending failure. Disconnect power before opening the unit.

• 1. Identify source: Listen carefully to locate whether the noise comes from the charger housing, wall receptacle, or vehicle.
• 2. Check mounting: Ensure the Primecom charger is firmly mounted to a solid surface; loose mounting can amplify normal hum.
• 3. Internal inspection (technician): With power off, open the housing and check that the relay, inductors, and any transformers are securely fastened.
• 4. Replace noisy relay: If the main power relay is chattering or buzzing excessively, replace it or the entire control board assembly.
• 5. Monitor temperature: If noise is accompanied by overheating or burning smell, discontinue use and seek professional repair.