Question about Maytag M3DH30B2A Dehumidifier

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Wont shut off

My dehumidifier will not shut off ever no matter what setting I put it on. Even the off setting. What part would I need to fix this . I have to unplug it when I dont want it running 24 hours a day Help please

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Re: Wont shut off

If it is removing moisture then you need to replace the humidastat
if it is running and not removing moisture then the sealed syestem needs to be looked at

Posted on Apr 23, 2008

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Why compressor comes on for a second then shuts off

Good Morning Friend,

I understand that the compressor on your Frigidaire dehumidifier, model# FAD504TDD, comes on for a second and then shuts off. First, make sure that when you are first turning your dehumidifier on that you put it in continuous mode. After about 3 days of continuous mode, set your appliance to the humidity level you would like. Secondly, the "Compressor" circuit has an automatic 3 minute time delayed start if the unit is turned off and on quickly. This prevents overheating of the compressor and possible circuit breaker tripping. Thirdly, make sure the tank is fitted correctly otherwise your dehumidifier will not turn on. Lastly, make sure your dehumidifier has sufficient clearance to operate. There should be a minimum of 12 inches clearance around your dehumidifier. I ask that you please follow up with a comment on the post, at your convenience, to advise if further troubleshooting is needed or if your dehumidifier status has changed successfully. Hope this is helpful.

-Best Regards-

Jun 14, 2014 | Frigidaire FAD504TDD Dehumidifier

1 Answer

It continues to shut down after start saying it is full, but it has no water in it. No matter if I take out the bucket and push back in it still says full. Not even a year old!!!

Here's a solution that often works. Turn the Master ON/OFF Switch to OFF. Unplug the unit from the wall outlet and wait 12-15 minutes before plugging it back in. Then turn the Master ON/OFF Switch to ON and set your control as you normally do. Hopefully, that 12-15 minute timeout allowed the unit to reset itself. If it continues to do this contact Haier Customer Support 877-337-3639 and have your Model Number and Proof of Purchase handy. If it's less than a year old, it's still under warranty.

Good lick. I hope this helps solve your problem.

Apr 18, 2011 | Haier DE65EJ Dehumidifier

1 Answer

I have Haier DE45EJ-L I am confused at what the setting should be. The Temperture is 68, when I put the humidity setting at 50 it shuts down, if I put it to 38 moisture is removed from the air. All the...

The unit shuts down when set at 50% because the controller is sensing that the humidity is below 50% RH. It comes on when set at 38 because the RH is higher, so it will try and dehumidify down to 38% RH.
According to the EPA the ideal RH in a conditioned space is 48 to 54%. You can set it and leave it at 50% if you are comfortable there and the dehumidifier will automatically come on when the RH is above 50% and will automatically turn off when the RH is 50% or below.

Mar 23, 2010 | Haier Dehumidifiers

1 Answer

Dehumidifier fan never shuts off. The only time

your humidistat is bad you can go to appliancepart and enter model number or call them they are really helpful

Jul 07, 2009 | Amana Dehumidifiers

1 Answer

Cleaned the filter and now wont turn on

there is a switch that when you put the pale back in the right way if the pale is not in all the way it is a kill switch so no water goes on your floor

May 08, 2009 | Kenmore 54351 Dehumidifier

1 Answer

Hampton Bay Dehumidifier Model# HB50

MY dehumidifier leaks water from upper part of unit causing water to leak on floor while running.

Feb 23, 2009 | Dehumidifiers

1 Answer


I went back and rechecked. If the fan mode is selected, you can only set the fan at one of the three speeds. If you leave it in the fan mode, the dehumidifier will not come on.

Once the fan speed is selected, it will run at that speed in the dehumidifier mode. The fan will keep running, even when the dehumidifier (compressor) shuts down.

The only way to get it to turn off is to use the clock setting, which either selects how long it stands-by before starting , or how long it will run before going back to stand-by. DeLonghi calls it "stand-by," we would call it "off." DeLonghi calls unplugged "off."

I've never turned mine to stand-by, because it will never get my entire house down to 30% humidity (I have it where my air handler returns air to the basement). I live in the greater DC Metro area, where 75% humidity is considered extremely dry.

Apparently the normal mode of operation is fan on unless awaiting a clock start, or encountering a clock shut-down; either condition puts it into the "stand-by" mode.

Sep 02, 2008 | DeLonghi DE500 Dehumidifier

1 Answer

DE 500P - Fan will not shut off

If you have the fan icon selected, it is supposed to run continuously. If you use the mode button (not the fan button) to change to relative humidity (the water drop icon), the fan should only run with the dehumidifier.

Feb 19, 2008 | DeLonghi DE500 Dehumidifier

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