Loud rattling or buzzing noise from indoor unit during operation.

Safety first: Turn off power before touching the unit.

Steps:

• Tighten panels: Check that the Blaupunkt indoor unit’s front cover is fully latched and all screws are tight.
• Inspect filters: Ensure filters are properly seated and not vibrating against the casing.
• Check blower: Remove the front panel and look for debris in the blower wheel. Remove any foreign objects carefully.
• Mounting bracket: Verify the wall bracket is firmly attached and the unit is properly hooked. Add foam tape between unit and wall if necessary to dampen vibration.