Question about Maytag M7DH65B2A Dehumidifier

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The Compressor on my Maytag M7DH65B2A quit running, I brought it to my shop and noticed corrosion and an oily residue on the sensor with the metal clip. Looks like the corrosion caused a hole in the coil. Is there any thing I can do to prevent this from happening on the other unit I have.

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This is a common problem with most dehumidifiers, not matter who the manufacturer is. The best way to prevent it is routine maintenance. Especially when you stop using it for the season. Dismantle it and clean the unit thoroughly. Putting a light coat of WD40 on the coils and contacts will help abate corrosion during the off season. If you are in an area where you use the dehumidifier continuously , then you should step up your routine maintenance to every 6 months. Cleaning the filter regularly, will help expand the dehumidifiers life span. By the way, the model you listed was manufactured by Fedders for Maytag.

Keep up the routine maintenance.

Posted on Apr 06, 2011

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Maytag dehumidifier fan works bucket full light is not on but don't hear the compressor. Coils are clean.






Hi,


There are 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

heatman101


././././././././././././././././

Jun 20, 2010 | Maytag M7DH65B2A Dehumidifier

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Compressor runs continually and cooling coils ice up but it doesn't defrost.


probally has lost some charge on the refrigerant. Low charge will ice the coil. Unless you are operating this at low temperatures. The ones I have seen do not have a defrost on them

Jan 14, 2010 | Maytag M7DH65B2A Dehumidifier

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No water collection and the coils are not cold? is there freon in the coils that need replacement


If the compressor is warm and running, chances are the charge is gone. There is no low pressure switch to shut off the humidifier. Don,t throw the unit out, take it to a repair shop to have it charged and fix the leak.
Good Luck!

Aug 16, 2009 | Maytag M7DH65B2A Dehumidifier

1 Answer

Everything sounds like it is running good even the compressor.


First check the coils to see if they are clean. Then check the fan and compressor . They should be running and warm to the touch. If you see ice on one of the coils, there is a good chance some gas has leaked out.If everything looks and feels good, you may have to take it to a repair shop to fix the leak and recharge it. Let the shop tell if it is worth fixing. Don't just throw it away. Be green!
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Aug 10, 2009 | Maytag M7DH65B2A Dehumidifier

1 Answer

M7dh65b2a dehumidifier is icing up


The clip that holds the sensor also rusted out on my M7DH65B2A (Rev-A-R) last year. How to reinstall the sensor with no clip? I used a pair of pliers to crimp/squeeze the sensor a bit. This makes it thin enough so that it could be positioned between a pair of coils, using a pair of pliers. I don't think this has ruined the sensor as the unit generally works well, except when room temperature drops into the low 60's farenheit. Best of luck.

Apr 30, 2009 | Maytag M7DH65B2A Dehumidifier

1 Answer

Running but not collecting water...


Dehumidifiers have only a few components, and operate on the same principle as a refrigerator, freezer, or air-conditioner.
Components Residential dehumidifiers have a cooling system made up of these primary components:

  • The compressor is the quiet motor (engine) of the cooling system. It's the black, football-size component at the bottom of your dehumidifier. The compressor runs as long as the dehumidifier humidistat (the humidity-sensor) calls for a reduction in the humidity.

  • The condenser is a series of finned tubes, similar to a radiator. It's usually near the circulating fan.

  • The evaporator is located near the back of the dehumidifier, right above the water-collection container. It also resembles a radiator or a coiled-up set of tubes. When the dehumidifier's humidistat senses increased humidity, it cycles on, which starts the compressor and circulating fan.

  • The circulating fan circulates the air over the evaporator and condenser coils.

Principle When the unit runs, the circulating fan and compressor also run. The fan continually draws room air over the evaporator coils, which are cold, and then over the condenser coils, which are warm. Because the evaporator coils are cold, the moisture in the room collects on them--just as the outside of a glass of icy liquid "sweats" on a warm, humid day. When the moisture on the coils increases, it drips off of the coils into the collection container.

The air then flows over the warm condenser coils and out into the room. This process removes water from the air and, because of the heat from the fan motor and compressor motor, the exiting air is somewhat warmer, as well as dryer.

Jul 29, 2008 | Maytag M7DH65B2A Dehumidifier

2 Answers

Running but not collecting water...


Sorry to be vague in advance. I am a bit confused as to the compressor seems to be running bit. If the unit is on you should hear the compressor making a continuous noise. What you have described over a relay going click every fifteen secs could be the compressor overload / relay. If it is then the compressor is trying to start hence the dimming lights. Either way I would suggest one of two scenarios either the compressor is faulty or cannot start due to the relay or the unit is short of gas. Eiher way not a good scenario. I would suggest a tech to confirm or spend the money towards a new unit. Hope this helps.

Aug 19, 2007 | Maytag M7DH65B2A Dehumidifier

4 Answers

Dehumidifier frosting up


It needs gas. Quite simply the only way it can freeze up is when the refrigerant gas is getting low to the point when it starts super-expanding at the evaporator. Any authorised refrigeration technician should be able to top it up, and check it for leaks - there may be a seal that is partially shot, or possibly a leaky joint / pipe / compressor. A refrigerant leak detector will track this down quickly. Only thing is - get a quote for the work first - sometimes refrigerant is pricey enough to make it close to not worth it on some units. Unfortunately this is not something you are permitted to do yourself (topping the gas up, not the leak checking) due to environmental legislation. Good luck, it should be worth doing, otherwise it will probably continue to get worse until the compressor fails, maybe quite quickly. Hope this helps :)

Mar 21, 2007 | Maytag M7DH65B2A Dehumidifier

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