Maytag atlantis mavt834aww stopped in mid cycle and now won't do anything.

water fill valve have a particle of trash or deposit from water.replace water valve and problem solved.

how to unlock or open the sealed door

It is a computer problem. My daughters machine did the same thing and the company came out and replaced the computer board and it fixed the problem.

Bad/worn/broken lid switch look at the back of the lid there is a little lid cam there that hits a switch,if this switch isn't engaging it will do just what you are describing.use a small screw driver to push the button in and see if it starts.

it does sound like a bad motor.
they are rather expensive on that machine,
you would be looking at 300 or so

Your drive motor may be fine. Check the water pump that is located in the back behind the small metal door on the left bottom corner and see if thats where your noise/water is coming from. These extraction pumps have bearings casing that gets mangled and locked up. Look right above the flywheel that the belt rides on in the W-pump.

lid switch assemblie.its the part where if you open the washer lid all stops,its that part.you may buy it on line with you model and ser# or at a local appliance store. God bless ,tom

you may have leaned on lid and damaged the lid switch , so the washer thinks the lid is open all the time unit will fill then stop with lid up.

did you turn th e water back on?

Unfortunately the motor now needs to be replaced. New motors cost around $125-$150 and are fairly tricky to install.