Question about Maytag M7DH45B2A Dehumidifier

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Heats up basement

Our Maytag M7DH45B2A dehumidifier works great but it heats up the basement making the temperature (not the humidity) uncomfortable.
Any thoughts??
Thanks.

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  • hulysax Jun 24, 2008

    I understand the mechanics of the dehumidifier but I still feel like ours heats up much more than anyone else's I felt. Obviously I'm compraing heat pump dehumidifiers to each other.

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Dehumidifiers and how they work
Heat pump dehumidifiers

Dehumidifiers use a heat pump (similar to an air conditioner's heat pump) or chemical adsorbents to remove moisture from the air without cooling the air.

A heat pump dehumidifier uses a fan to draw indoor air over a heat exchange coil. The coil is almost freezing. The water in the air condenses on the coil and is drained. A second heat exchange coil reheats the air, which the dehumidifier exhausts into the room.

A heat pump dehumidifier dumps heat lost from the compressor and fan motors into the air. It returns to the indoor air the heat generated by the dehumidifier turning water vapour to liquid. I got this off the internet

Posted on Jun 24, 2008

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I have always set my M7DH45B2A at 60 percent (it's in the basement). Lately it runs all the time and the humidity does not go below 65 percent. It seems "stuck" there even if I lower my...


There are 5 basic, but solvable reasons 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 - 65 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 level
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
problem.

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.

I hope the above helped you. Please let me know and thanks for choosing FixYa.

Aug 10, 2011 | Maytag M7DH45B2A Dehumidifier

1 Answer

MY unit keeps on freezing up no problem with the filter dirty it gave me a problem after 3 months of use . i set it for 60% 50% it freezes up all the time i shut it off let it defrost and same thing all...


I think a part of the problem is that you have the humidity extraction level set to high. 50 to 60% is pretty much the humidity level throughout most of the year. Lowering it to 35%m should make a difference.

If you are using this in a basement application, the temperature at floor level can be 10 degrees cooler than at shoulder level. Most dehumidifiers don't work well at temperatures between 40 & 60 degrees F. Unless, they are Low Temp models designed for 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 can resolve this problem.

If you can access the cooling coils, they may be dirty and need wiping off with a damp rag. Then flow with a dry clean rag to dry them. A light coating of WD40 helps to preserve the coils.

I hope this helps you to further troubleshoot and solve the problem. Thanks for choosing FixYa.

Jul 26, 2011 | Maytag M7DH45B2A Dehumidifier

1 Answer

The unit runs but no longer removes water from the air, there is high humidity in the basement. Is it worth repairing the unit because it's 7 years old and where can I purchase another Mayta unit?


Edward, 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
level
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
problem.

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.

Hope this helped you to troubleshoot and solve the problem without having to make any repairs or replacement of the unit.

Jul 08, 2011 | Maytag M7DH45B2A Dehumidifier

1 Answer

I have purchaced two maytag dehumidifiers M7DH45B2A either one works. I cleaned inside and out blew out the coils with air. Motor runs but will not take out the humidity.


You may have the humidity level set to high. Keep in mind, the higher the number on your LED screen, (if your units have LED display) the more humidity remains in the house. Lowering the numbers on the screen (to 45%), should have a better affect.

Hope this helps you. Please let me know.

May 11, 2011 | Maytag M7DH45B2A Dehumidifier

1 Answer

Not lowering humidity. Runs OK. Low or no water yield. Ice Patch on outside of cabinet (on left facing the unit). Maytag M7DH45B2A Dehumidifier


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There can be many reasons why a dehumidifier will not work or collect water.


Here is a tip that I wrote to help people to figure out what is going wrong with their dehumidifier

Dehumidifier is running but no water is in bucket
http://www.fixya.com/support/r4662409-dehumidifier_running_but_no_water_in

heatman101

Sep 05, 2010 | Maytag M7DH45B2A Dehumidifier

1 Answer

My dehumidifier does not come on automatically.


Power button on mne is on the far left of the control panel.

Jan 17, 2009 | Maytag M7DH45B2A Dehumidifier

1 Answer

Works well but


Yup, they eat energy.

An electric dehumidifier includes a refrigeration cycle that is very similar to a window AC units and refrigerators. They cool the air in the basement to condense and collect water and remove humidity, heat the air as a required consequence of the refrigeration cycle and dump it back to your basement.

Two sources of humidity in basements include warm outside air that naturally cools due to below grade earth contact and water passing from the ground though the floors and walls and evaporating into the basement. Dehumidifiers do most of the work in the summer when higher temperatures outside enable air to hold more water content.

In the winter, cooler outside air contains less moisture by weight eventhough it may be raining and the relative humidity in basement will be less because the air is warmed relative to the outside. The lower moisture content in the winter also absorbs the water passing through the walls and floor.

From an energy perspective, you may want the humidity set NOT below 50%. This will keep humidity below the level mold desires, but prevents the dehumidifier from doing more work and eating more energy than needed. A cheap battery powered temp/humidy meter left in your basement will help. Sources that include the "mold triangle" (temperature, water & food) often separate fact from expensive hype.

If the dehumidifier doesn't keep up, consider adding a moisture barrier to the basement walls and floors such as Dry-lock and floor paints to ****** moisture entry. Moisture barriers act very similar with water as insulation does with heat. They don't eliminate the need for a dehumidifier, but they reduce the work they do and energy they eat.

Oct 02, 2008 | DeLonghi DH40P Dehumidifier

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Maytag m7dh45b2a


Check room humidity, if it is already below 35 it will not start because that is the lowest it will work to.

Jun 12, 2008 | Maytag M7DH45B2A Dehumidifier

1 Answer

Temp and humidity levels are not correct


It sounds as if the temperature sensor probe is touching the cold coil inside. The sensor is located in the incoming airflow, in front of the cold coil. It must not touch the coil. This should be visible with the cover off. You can gently bent the sensor away fron the coil, 1/4-1/2" of clearance is plenty.

Jun 06, 2007 | Maytag M7DH45B2A Dehumidifier

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