Question about Maytag M7DH45B2A Dehumidifier

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The copper tube coming out of the conpressor is hot but the coils running around them are cool to warm at best. Does this mean I am out of coolant (freon) and if so can that be refilled or even if it could does it mean there is likley a leak? Unit has been in use for two years.

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Copper should be hot coming out of compresser(small tube) cold going in (lg tube)

Posted on Jun 25, 2009

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My dehumidier blows very hot air while working. Makes it hotter than it was before starting. Like a furnace.


It is normal for a dehumidifier to discharge warm air. A dehumidifier is really an air conditioner - a fan blows humid room air across a cold fin coil that causes the moisture to condense on it and drip into a container - thus cooling AND dehumidifying the air. The cool air is blown over the warm coil and discharged out the back. A dehumidifier WILL normally increase the temperature of the room it is in.
You can do the same thing with sitting an A/C unit on a stool in a room. Room air will be drawn in, cold air will come out the front, hot air out the back and water will drip on the floor. And, the room will get hotter, due to what is called "heat of compression" even though you're running an A/C unit.

Jun 26, 2013 | Windchaser WDH928 Dehumidifier

1 Answer

The compressor on my Danby dehumidifier turns on for a few seconds, very weakly, and quickly cuts out. The fan and control panel are all working properly. The humidity is high enough for it to turn on...


Sounds like you've lost a lot of freon. Find the pump on your unit. Be careful, but after running it a while, touch the tube somewhere between the pump and cooling coils. If it is not hot then you have lost fluid. What happens is under normal working conditions the compressor would compress the freon making it hot, which then gets cooled by the radiator coils. In your case, there isn't enough fluid to compress to make it hot. Unfortunately, you need to have it refilled by a repair shop. Try your local A/C or HVAC shop. Don't be surprised if they can't refill with freon as it's bad for the ozone and being phased out.

May 04, 2011 | Danby DDR586R Dehumidifier

1 Answer

Unit runs but the coils dont get cold


The compressor should be cool near the bottom and hotter at the top. If it runs but the coil is not cool, it probably lost its charge. Developed a leak and lost all the refrigerant.

Jun 28, 2010 | Fedders A7DH45B2A Dehumidifier

1 Answer

The top condenser coil gets frost on it and is really cool, but the other coils do not get cooled at all. For this reason, the unit doesn't produce even 10% of the normal water in the catch bucket. Outside...


The way i see it, there 's a two possible reason why this happen

1. maybe you have a leak and your refigerant is under charge, why do'nt you open up the unit and do some leak testing by using soap bubble.

2. it may be clogged, How old is your unit, it is just a hint but maybe when your system reach a certain degree or level of temperature reading, even though your motor is running but the refrigerant can't pass thru the capillary tube(the very thin copper tube) and clogged onthe strainer. But this is too technical so I advise is you might need some actual technical assistance from a tech guy.

Nov 03, 2009 | LG LHD45EL Dehumidifier

1 Answer

My model LG3850A20500H dehumidifer is not collecting any water but is running. Is there anything I can check?


You can check the condenser unit, by touching it. (be carefull of hot surface) if the condensor unit not warm at all we can sure that the dehumidifier is not working, (only fan). The problem may be come from compressor or temperatur limit is not working or cooling agent is finished cause by some leakage on the tube.

Aug 12, 2009 | Dehumidifiers

1 Answer

Everything seems to run fine, just hasn't pulled a drop of water


remove the back airfilter, and touch the tubes while the unit is running, if nice and cold, all is well, there just isnt any moisture there. but if compressor is running and tubes are warm , means freon/coolant has leaked out

Jul 22, 2009 | LG LHD65EBL Dehumidifier

1 Answer

AmanaD545M Runs but no water comes out


if the compressor is running and the coils dont cool, then you have a refrigerant leak or a plugged capillary tube. it would cost more to fix than to but a new one. sorry but its time for a new one.

May 11, 2009 | Amana D545M Dehumidifier

1 Answer

Dehumidifier freezes up


Most dehumidifiers need warmer air to work properly. The temperature in a basement is usually 60 - 65F; too cool for standard models. You could buy a "basement" dehumidifier. They're designed to work at lower temperatures; some as low as 40 F. Costs are about the same as a standard dehumidifier; you just have to find it.

For a cheap fix, try this; it seems to be working for me.

Since the condensate coil (the one icing up) is cold, the air entering it is too cool and the condensate frosts up the coil. Additional condensate freezes to the frost and before you know it, you've got a block of ice. Since the air coming out of the front is very warm take a large piece of cardboard around 6' x 3') and form a V. Placed it in front of the dehumidifier so it channels some of the warm air back to the rear where it warms the moist air up before it hits the cooling fins. It's helped keep the ice down.

If you want something attractive, any screen that redirects some of the air back to the rear will work. Just leave the top open so it doesn't get too hot and the some of the drier air gets out into the room.

Jul 02, 2008 | GE AHG40LJ Dehumidifier

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