Air conditioner runs but does not cool the room effectively; supply air feels only slightly cooler than room air.

Safety first: Turn off the power before cleaning filters or coils.

Steps:

• Clean filters: Remove the Blaupunkt indoor filters and wash them with mild detergent. Dry completely before reinstalling.
• Clean evaporator coil: Gently brush dust from the coil fins. For heavy dirt, use a foaming coil cleaner approved for aluminum fins.
• Check airflow: Ensure supply and return air are not blocked by furniture, curtains, or covers.
• Verify mode and setpoint: Confirm the unit is in Cool mode with a set temperature at least 3–5°C below room temperature, and the fan speed is not set to low.
• Refrigerant / sizing: If performance remains poor, a technician should check the refrigerant charge and confirm the Blaupunkt unit’s capacity is adequate for the room size and heat load.