Frost or ice forming on the evaporator coil or front grille.

Safety: Turn off and unplug the unit before defrosting. Do not chip ice with sharp tools.

Steps:

• Defrost: Leave the unit off with the front cover open until all ice melts. Place towels to catch water.
• Clean filter and coil: Wash filters and clean the evaporator coil fins.
• Check room temperature: Avoid running cooling mode when the room is already very cold (below about 18°C / 64°F).
• Fan speed: Use a higher fan speed to improve airflow.
• Professional service: If icing recurs, have a technician check refrigerant charge and the evaporator temperature sensor.