Opening your dehumidifier to a layer of ice on the coils? Freezing coils stop the unit from collecting water and can damage it over time. The cause is usually cold air or restricted airflow.
Here is why the coils freeze and how to stop it.
This article will teach you:
- Why the coils ice up
- How airflow prevents freezing
- What to check first
- When a part has failed
Why the Coils Freeze
- A room too cold for a standard dehumidifier.
- A clogged air filter starving the coils of airflow.
- A blocked intake or fan.
- A faulty defrost or frost sensor.
What You’ll Need
- A clean or new filter
- A hygrometer and thermometer
- Your owner’s manual
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How to Stop the Coils Freezing
- Warm the room. Run the unit only above its minimum working temperature.
- Clean the filter. Wash or replace a clogged filter that blocks airflow.
- Clear the intake. Keep the intake and fan free of dust and obstructions.
- Defrost fully. Turn it off and let all ice melt before restarting.
Pro Tip: Standard dehumidifiers freeze up in cold rooms because there is not enough warm air moving across the coils. For a cold basement or garage, choose a low-temperature model designed for it.
Didn't fix it? Ask a technician on the AppliancePartsPros forum.
Post your model number, the symptom, and what you've already tried. Appliance techs and experienced DIYers answer for free, usually the same day.
Ask the forum →80,000+ solved repair threads · no account needed to readWhen to Look a Little Deeper
Because freezing ties to airflow and sensors, it helps to check those, and reviewing the frost sensor, a fan that will not run, or a unit that runs constantly can reveal the cause.
Because prevention matters, understanding why a dehumidifier freezes up and how to prevent it and keeping it clean with a deep clean of the unit both help.
When to Call a Pro
If the room is warm enough, airflow is clear, and it still ices up, the defrost control or refrigerant charge is at fault and needs service.
Related guides
- Bathroom Fan Louder in Cold Weather: What to Check
- Solving Error Code 61 on Your LG Multi-Split AC Unit
Wrapping Up
Frozen coils are usually cold or airflow. Here’s the recap:
- Run it above the minimum temperature.
- Clean the filter.
- Clear the intake and fan.
- Let ice fully melt before restarting.
Warm the room and clear the airflow, and the ice stays away. You’ve got this.
The last step is the part itself: match a dehumidifier parts to your model number rather than to a photo or a part name.
Still stuck after this guide?
Two free options: post your model number and symptom on the forum, or search the model number in the shop to see every part that fits.
