Dehumidifier frost buildup on evaporator coil and reduced airflow

Safety: Unplug the unit and allow ice to melt before working on it.

Steps to correct icing:

• Thaw the coil: Turn off and unplug the unit until all ice melts. Do not chip ice with sharp tools.
• Clean filter and coils: Ensure maximum airflow by cleaning the air filter and evaporator coil.
• Check room temperature: Move the unit to a warmer area if the room is below the minimum operating temperature.
• Inspect defrost sensor: Verify the evaporator thermistor is properly attached and functioning. Replace if readings are incorrect.
• Professional sealed system check: If icing recurs quickly with good airflow and correct temperature, a technician should check for low refrigerant or other sealed system issues.

Test: After cleaning and any repairs, run the unit and confirm that only light, temporary frost forms and melts during normal defrost cycles.