Dehumidifier compressor runs but evaporator coil freezes into a block of ice; airflow decreases and water collection stops.

Safety: Unplug the unit before defrosting or cleaning.

Steps:

• Defrost: Turn off and unplug the dehumidifier. Allow all ice to melt completely (place towels under the unit).
• Clean filter and coils: Wash the air filter and vacuum dust from the evaporator and condenser coils.
• Check room temperature: Use the dehumidifier only within the recommended temperature range. In cold basements, consider raising the temperature or using a low-temperature model.
• Fan check: Ensure the fan runs at full speed and airflow is strong. Replace the fan motor if it is weak.
• Sensor check: Inspect and, if necessary, replace the evaporator temperature/defrost sensor if the unit does not enter defrost mode automatically.

If icing continues despite proper airflow and sensor function, a sealed system issue (low refrigerant) is likely and requires a technician.