How to Fix / Troubleshooting

Safety first: Unplug the unit and allow it to cool before touching internal components.

Improve ventilation: Ensure the dehumidifier has at least several inches of clearance on all sides. Do not place it in a confined closet or against walls.
Clean air filter: Remove and wash the air filter. Let it dry completely before reinstalling.
Clean condenser coil: Access the warm condenser coil and use a vacuum or soft brush to remove dust and lint from the fins.
Verify fan operation: Turn the unit on and confirm that the fan runs at full speed. If the fan is slow or not running, see fan motor fault entries.
Check for heat sources: Avoid placing the unit near heaters, direct sunlight, or other appliances that blow hot air onto it.
Persistent P4: If P4 continues after cleaning and ensuring good airflow, a temperature sensor or the main PCB may be faulty. These components may need to be tested and replaced by a technician.

Dehumidifier displays P4 and stops; may occur after long operation or in hot environments.

Possible Causes