Wont extract water

How humid are the conditions? if dry, will not extract water, can only extract water from humid conditions

did you make sure the dirty water tank is cleaned out and the cap is on?also did u check the clear kinda hour glass shaped thing in the front where the water sucks up at to make sure there is no blockadge?

Give it a good cleaning before you do anything else. If the fins or filter are dirty, you won't get good service from it. Make sure the drain path is open.

check dirty water tank make sure lid is on correctly and that the plunger is not stuck.

Pump mite b blocked-filter on front machine or pump stopped working need to replace pump if filter is clear , to empty water out lay outlet pipe low down on floor and rain out so u can repair

Loud whining noise generaly indicates motor issues, which also provide suction to extract water from carpet.

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my maytag neptune mah3000 keeps shutting off in middle off cycle

There are three things that must be working to extract water. The 'coil' (a finned metal part that allows air passage) if it's filled with dust and obstructions, no air can move...no water. There is a blower motor that mus move the air. If it is seized up an not blowing air...very little or no water. The compressor uses condensation from the air moving across its coils (like the moisture than forms on a cold glass on a humid day) to extract the water from the air. If it's not working then no water.
So, if there is air blowing out of the dehumidifier the blower is working. If the air is room temp the compressor is not working. If it's real hot air, and the humidifier keeps cycling on and off quickly, the coil is dirty. Those are the 3 things that need to be working.

the problem is that you are having an overfill issue. You can fix this by extracting the water from the over fill pan. you will have to take the toe kick off and then take that panel off which should have 3 screws on each side and requires a 20 tork screwdriver to get it off. after that is taking off there is a wiring harness that you will see put your hand right under the wiring harness and feel in the over fill pan if there is water you will have to extract it with a sponge or a turkey baster. when you get the unit put back together then reset your unit by holding the start/stop button for 7 secs and that should fix your issue

I assume you are talking about no spray. Check the rod inside the handle, amke sure it is moving up and down when you squeeze the trigger, If it is, is water coming out the bottom of the tank when you push in the valve, if it does, then the reservior asm. ( the tank sits on it) maybe bad and will have to be replaced. If yours has a foam filter on the lid of the dirty water tank, make sure there is a 1/4 or so gap from the top of the filter to the top of the tank lid.