Question about Whirlpool AD40DSL Dehumidifier

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Frosted Coils It now frosts up at 70 degrees and warmer, never did before. What happened, I have already dismantled the cover and cleaned everything I could and even ran it without the coil cover on to no avail. Very well circulated also. Could there be a hidden issue blocking circulation??????? Any ideas let me know, this is too expensive to replace.

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Re: Frosted Coils

You prob do have a restriction in the sealed system. This causes the coils to not heat enough to stay defrosted. 68 degrees i believe is the minimum so if its 70 its def got a issues with the coils not staying hot enough to stay defrosted. This will most likely require replacement. Especially if you have cleaned coils and still freezes. Try it in different room. If persists most likely a sealed restriction. Replace.

Posted on May 01, 2008

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Why does a dehumidifier go into defrost mode?

It gors into defrost mode if the cooling coils frost over. This usually occurs when the ambient air temperature in the room or basement reaches 65 Degrees F or lower. It's a normal operation and nothing to worry about at this point. Also, keep in mind that the air intake filter should be cleaned at least once every two weeks. This will help to reduce the frost on the cooling coils.

I hope this answered your question and thanks for choosing FixYa.

Sep 19, 2011 | Midea MDC-45AE Dehumidifier

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Coils freeze up. completely blocked. have to shut off to thaw coils. located in basement.

After the unit is totally thawed and dried, turn the unit Off if you haven't already and unplug it. Remove the filter and clean it. If it's really dirty wash it with warm water and dish washing liquid, thoroughly rinse it and allow it to completely dry, before reinstalling. DO NOT operate the unit without the filter in place.

Because the air temperature in a basement is colder at floor level, than at shoulder level, this caused the coils to freeze. Dehumidifiers do not work well at temperatures at or below 60 degrees F. That is, unless, it's a Low Temperature model, designed especially for basement applications. Obviously, yours isn't a Low Temp model.

To overcome this, place the unit up on a sturdy table, counter top, etc, that can handle the weight of the unit, as well as a full bucket of water. The higher off the floor the better. This way, the ambient operational temperature will be higher and the coils will have less of chance to freeze again.

I would suggest that continue to monitor the unit and if you notice that it's doing more than a little frosting on the coils, turn the unit OFF immediately. A little frosting is normal and the deforst mode should kick in and thaw the coils. When this happens, the compressor should automatically shut OFF, but the fan will continue to run. Once it's defrosted, the compressor will start again, if necessary.

I hope this helped you to troubleshoot and solve the problem. Please let me know.

Jul 19, 2011 | Whirlpool AD50DSL Dehumidifier

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I noticed today our Goldstar dehumidifier was running, but the back was all frosted up. What does that mean?

That's an indication, that the filter needs to be removed and cleaned.
Turn the unit OFF & unplug it before removing the filter. You can vacuum the filter or if it's really dirty, wash it in warm water and dish washing liquid. Rinse thoroughly and allow to completely dry, before reinstalling. Never operate the unit without the filter installed.

If the coils continue to frost, but not defrost, they also should be cleaned.

Jul 18, 2011 | Goldstar DH304 Dehumidifier

1 Answer

The dehumidifier runs constantly and is not collecting water. We had it in the basement where it frosted up. Brought it upstairs where it ran and ran without collecting water. It was not like this last...

Sue, there are 5 basic, but solvable reason for what you described. Please pay particular attention to numbers 1 & 2.

1. The humidity extraction level is set to HIGH. Lower it to 32-35%.
2. Air intake filter is dirty or clogged. Turn unit OFF, & Unplug the
Unit, before removing to inspect & clean it, if necessary. If washed,
allow filter to completely dry before reinstalling. DO NOT operate
the unit without the filter.

3. Obstructed air flow. Maintain a minimum of 12 to 18" of clear air
space around the entire unit.

4. Cooling coils are dirty and need to be cleaned. Use warm water & dish washing liquid to
clean the coils. Rinse and wipe dry. Apply a light coating of WD40 to the coils.

5. Ambient air temperature at floor level is between 40 - 60 degrees.
dehumidifiers do not work well between those temperatures
(Unless, you have a Low Temp Unit). This applies mainly to
where the air temperature at floor level is colder than at shoulder
in basement applications. Raising the unit up off the floor,
onto a sturdy table, counter top, etc, that can handle the weight
of the unit, plus a full tank of water, will usually resolve this

If none of the above solves the problem, it may be a case of the compressor needs to be recharged with refrigerant gas or that the humidity condenser sensor has failed. These things usually occur in units that are 5 years old or older. It's rare in a unit younger than that. But, it can happen.

You also asked, "
do you know of a cradle to cradle product that lasts longer than this?". Unfortunately, I have no idea what you are talking about. Could you please explain? Thanks.

Jul 11, 2011 | GE AHG50LB / AHG50LD Dehumidifier

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I have a ebac bd80 and the coils stay frosted ,

Frost means one of two things, low refrigerant or low airflow across the coil. The unit probably has lost it's refrigerant charge ( or some of it's charge) even though it hasn't been used.

Oct 25, 2009 | Ebac Dehumidifiers

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Running but not collecting water

your coils are probably frosted up. This can happen from the basement temperature being too cold if you dont have the automatic defrost type of dehumidifier, or it could be low on coolant from a pinhole that leaked it out. Mine did the same thing and I had to buy another one. I bought one thats operates down to 41 degrees Fahrenheit and it is an automatic defrost type. It works good for my basement because I have central air which makes the basement even cooler and harder to dehumidify without freezing the dehumidifier up.

Apr 19, 2009 | Kenmore 53701 Dehumidifier

1 Answer


Most dehumidifiers these days have a built in defrost control, which turns the compressor off when the coils frost up while the fan continues to blow to help melt the frost off, so if it is frosting you may need a new defrost control, but first check the following: If your model has an air filter, clean it, as restriction of air flow will contribute to icing. Try to move the unit to a warmer location. Usually the best way to do this is to get it above the floor as far as possible, as the air temp is warmer closer to the ceiling than it is at the floor. Make sure there is plenty of room for air to circulate. (don't push it against a wall)

Sep 15, 2008 | Danby Dehumidifiers

1 Answer

Model HDN455

Check the coils at the back of the dehumidifier to see if there is any frost buildup on it. If there is, turn off the machine for a while until the room warms up and melts off the frost. The machine works by condensing the moisture in the air over these coils, so if the coils are frosted over, or are not cold enough, the moisture cannot condense. If the coils are not cold enough, you may want to get it refilled with refrigerant. You will need to take it in for servicing in this case.

Hope that helps! Should you have any further questions, please feel free to post them here.

P.S. - If you find that the solution/answer I provided led you to, or resulted in a fix, please close the ticket with a FixYa! rating. I would be very grateful for your show of appreciation.

Thank you for using FIXYA!


Aug 31, 2008 | Haier HDN655E Dehumidifier

1 Answer

Humidifier coils freeze

I believe a dehumidifier is supposed to operate in temps above 60 degrees. Even though your house is warmer than that, the air entering the dehimidifier may be getting into that range due to it being on a basement level etc. This is perfectly normal and is not a malfunction with your humidifier.

Your options are to either place the dehumidifier closer to a heat source in order to keep the air which is entering warmer. (I've even heard of someone placing a light bulb in front the unit during winter to warm the air slightly as it enters). Because the dehumidifier's coils get cold in order for it to collect moisture from the air, if they are freezing, giving the unit a rest for a few hours every few hours may allow the coils to thaw in between and prevent them from reaching freezing temperatures while running. You could use a timer to accomplish this, but you'll want to insure that it's a commercial grade timer in order to handle the electrical draw that the dehumidifier requires.

Dec 29, 2007 | Eva-Dry EDV300 Dehumidifier

5 Answers

Dehumidifier frosts up

A dehumidifier will often frost up if room temperatures are colder than about 65 degrees F. If your room temperature isn't this cold, airflow to the unit may be restricted or blocked entirely. 1) Be sure the unit is set far enough from the wall so that airflow isn't restricted. 2) Clean the evaporator coils. To do this, unplug the dehumidifier and take off the outer cover. Allow excess moisture to evaporate from the coils. Then, using a brush attachment on a vacuum cleaner, remove all dust buildup. If necessary, cover the motor and electrical parts with plastic sheeting and spray with water.

Jan 18, 2006 | Fedders A7DH65B2A Dehumidifier

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