How to Fix DeLonghi Dehumidifier Problems: Basic Troubleshooting Tips

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Nothing is more frustrating than a malfunctioning dehumidifier. Imagine buying a DeLonghi unit to achieve desired humidity level in your home, only for it to stop working. I have been there before, so I will share the fixes to basic DeLonghi dehumidifier problems below.

To fix a DeLonghi dehumidifier, you must first understand the specific issue you are facing. Problems such as the device not turning on or reducing humidity are common and easy to solve. However, you may encounter complex yet resolvable troubles like a malfunctioning pump or fan.

This article will cover the DeLonghi dehumidifier problems you may come across. We will also share some troubleshooting tips to help you run your DeLonghi dehumidifier correctly.

What Are Common DeLonghi Dehumidifier Problems? And How To Fix Them?

A DeLonghi dehumidifier may not always work as expected. If you come across major issues, contacting a technician might be the best. However, you can easily fix minor problems by yourself.

Dehumidifier Will Not Turn On

If your DeLonghi dehumidifier does not turn on, check if the power cord is plugged in correctly. Switch on the power button and set the humidistat above “Minimum.” This setting allows the humidifier to regulate indoor humidity right away.

Besides the plug, you should also see the water tank. Ensure it is not too full because it automatically shuts off the machine. Empty a full water tank as needed.

If you have drained all the water and the unit is still not working, remove the tank from its housing and reinsert it. Sometimes, improper water tank installation can stop the dehumidifier from working properly.

Dehumidifier Powers On But Does Not Lower Humidity

Does your dehumidifier turn on but fail to maintain humidity in the room?

The first thing to check is the air filter. A filter that’s clogged up can restrict airflow and stop it from reducing humidity during hot months. Detach the grill cover to access the air filter. Use a vacuum cleaner to clean dirt and debris stuck in the filter. You can also soak it in warm water to remove stubborn particles. Allow the air filter to dry completely before returning it to the machine.

If the filter is still clean, the culprit might be the defrosting feature of the dehumidifier. This setting automatically turns on when ice starts to build inside the compressor. Fortunately, the fix is as simple as waiting for the ice to melt. Unplug and turn off the dehumidifier. Leave it alone for 30 minutes up to several hours, depending on your indoor temperature. Consider increasing the room temperature to prevent ice buildup in the future.

Dehumidifier Makes the Room too Cold

A DeLonghi dehumidifier uses evaporator coils to pull moisture from the air. It does not necessarily make your room cold. It simply removes humidity that typically causes air to feel hot and heavy.

However, if you feel the room temperature becoming colder than usual, it might be time to inspect your dehumidifier.

First, check if your dehumidifier is in defrost mode. This security feature automatically turns on when you have frozen coils to protect internal components. Unplug the appliance from the electrical socket to accelerate the process. You could also add something to heat up the space.

Another culprit behind unnaturally cold temperatures is a broken compressor. A functional compressor will release dry air instead of cold air. If yours is faulty, you will have to replace it. 

Dehumidifier Does Not Blowing Air

If you don’t feel air blowing out of the dehumidifier vents, it might be a serious problem. The fan motor has likely burned out.

But to rule out this possibility, you must first assess if its placement is ideal. Avoid placing it right on a wall or against furniture because it might not produce enough air. Leave at least 12” away from all obstructions to prevent blocking airflow.

You can also inspect the grill or filter for dirt and dust that may block air. Unplug it and clean debris as needed.

If you already checked everything and there is still no air, the fan motor is probably broken. Weigh the cost of replacement against the price of buying a new dehumidifier. Sometimes, the latter is a more cost-effective solution.

Dehumidifier Does Not Work for Three Minutes When Turned On

You may notice your DeLonghi dehumidifier does not work after switching it on for three minutes. There is usually no need to worry about it because it is normal.

DeLonghi dehumidifiers have a safety backup to prevent damage to the internal parts. Simply wait for up to three minutes to turn the machine on.

If it still does not work after three minutes, try plugging the power cord into a different electrical socket.

You can assess its humidity monitor if you have already tried a different electrical socket. Use a multimeter or volt-ohm meter to check whether the overflow switch is working or not. Contact a service technician if you are not confident in doing this task on your own and if the humidistat is broken.

Internal Pump Does Not Work

All DeLonghi dehumidifiers have a built-in tank for collecting water. When the water tank becomes full, you must drain it to resume the dehumidification process.

However, if the water is not draining, the internal pump might be broken. Fix it by following the steps below.

First, make sure to connect the drain hose to the port. You will find a sensor on the back that tells you if it is sitting correctly.

You must also inspect the drain hose. Correct any kink or knot to ensure proper water flow.

Then, unplug the unit for several minutes before switching it on again. Doing so can clear errors caused by the pump sensor.

However, if your dehumidifier is not working, contact customer service for DeLonghi dehumidifier troubleshooting.

Dehumidifier Does Not Collect Water

A DeLonghi dehumidifier can stop collecting water due to various reasons. These include frozen evaporator coils, a full tank, a broken fan motor, a bad capacitor, a clogged filter, and complex control board issues.

It is essential to figure out why the dehumidifier stopped collecting water. Inspect the internal parts for problems.

But if the issue is with the capacitor or control board, you must contact a service technician to fix it.

Dehumidifier Leaks Water

A loose hose connection is usually the main culprit behind a leaky dehumidifier. Secure the drain hose tightly. You must also ensure it is free of kinks and blockages.

However, if your DeLonghi dehumidifier uses refrigerant fluid, the cause of the leak might be a faulty component. It is best to ask for professional help to look at your unit.

Fan Stops Working

The fan is an essential part of any dehumidifier. If it stops working, the unit will not run as well.

Check the fan blade for bends or breaks. Gently turn the blade by hand to ensure it does not rub against the housing. The fan is defective if it touches the housing or does not turn slowly. You must replace it with a new one.

However, if the fan moves slightly from the shaft, it might be loose. Tighten the blade using a screwdriver to fix the problem.

If nothing is wrong with the blade, you can inspect the motor. Try a multimeter in order to see if there is a current in the motor. If not, it needs replacement. However, sometimes, buying a new dehumidifier is more cost-effective than replacing a fan motor. Weigh the costs before deciding which one to do.


A DeLonghi dehumidifier can help maintain humidity levels in your home. It prevents mildew growth and alleviates allergies.

However, a DeLonghi dehumidifier can stop working correctly. Problems may arise, such as the unit not turning on, cooling the room excessively, and leaking water. You can refer to our troubleshooting tips above to fix these common issues. But if you are facing complex problems, it is best to contact customer service or a technician.

Do you have other problems with your DeLonghi dehumidifier? Feel free to send your concerns to our contact page, and we will help you resolve them.

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