Question about Maytag M7DH45B2A Dehumidifier

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Maytag M7DH45B2A freezing problem

My humidifier keeps freezing up coils temp in room is 72 and humidifier is set at 55% i dont think defrost is working anymore

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Re: maytag M7DH45B2A freezing problem - Maytag M7DH45B2A Dehumidifier Dehumidifiers

Is this a humidifier or dehumidifier?

Posted on Nov 16, 2007

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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

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

Is this unit (Maytag M7DH45B2A) only a dehumidifier ..or.. both a dehumidifier and a humidifier?

That is a dehumidifier only... humidifiers work on a totally different principle...


Jan 04, 2011 | Maytag M7DH45B2A Dehumidifier

1 Answer

Coil freezes up with in seconds of unit start up


Here is a tip that I wrote that will help you understand why and what you cando with a dehumidifier that ices up.

Dehumidifier is Freezing up and not working


Oct 04, 2010 | Maytag M7DH45B2A Dehumidifier

3 Answers

Dehumidifier Freezing up

Based on the information provided above, I am unable to provide a positive solution to your issue. I have provided some common solutions to help guide you in your search.

This link,, provides exploded view imagery, belt routing diagrams, parts imagery and function, parts ordering and shipping information, error code details, just about anything you need to get your appliance up and running again. Just follow the links to navigate through the site.

You will need to enter the model number stamped on the manufacturers product information data tag, located on the unit, and not in the User’s Manual. to access your product information.

Clicking on the underlined links will take you directly to that page.

Note: A volt-ohm meter is beneficial in performing electrical tests.

Some models utilize a defrost thermostat that simply switches the compressor off and on. This can be replaced by unsnapping it from the condensor coil.

Another type uses a defrost control kit to cycle the compressor and is a little more involved in the replacement.
See Item #
878674 by clicking the link below

If my assistance helped resolve this issue, please show your appreciation by rating how effective my advice was in resolving this issue.
Thank you,
Dave E. (Illeagle)

"Your satisfaction is my personal reward"

Jul 11, 2008 | Dehumidifiers

1 Answer

Heats up basement

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

Jun 24, 2008 | Maytag M7DH45B2A Dehumidifier

1 Answer

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

2 Answers

Humidifier is freezing up

I have the same dehumidifier and it does the same thing. but I was able to fix mine. It was not low on refridgerant. There is a temp. sensor clamped to the evaporater coil with a thin metal clip. The clip rusted out and the sensor fell out of position. I used a small stainless steel hose clamp and clamped the sensor back into position. It now works fine

Apr 10, 2008 | Fedders A7DH45B2A Dehumidifier

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