How do I disconnect the washing machine?

If the washer keeps filling up without overflowing onto the floor , then you have the drain hose too deep into the drain and it is siphoning, pull the drain hose back up from being so deep and have it only about 10 inches into the drain, tie it into place with a shoestring or wire tie.
Now if your problem is that the washer is overflowing onto the floor, then there is a clear rubber hose that has been disconnected from the washer, this is the diaphragm hose. Have a technician reattach it. It shuts the water off and starts the machine when its gets enough water, but it wont if the hose is disconnected. Mr Burk

if you have to shut off the water supply valve of the residence (water keeps flowing after turning off the washing machine or unplugging the washer), the failed component is definitely a stuck open water inlet valve (fill valve) of the appliance. If the water stopped by pushing the timer or unplugging the machine, another internal electrical control related problem exists, such as a faulty timer assembly or controller board, or a pressure system failure (water level detection/monitoring system) - failed pressure switch (rare), clogged air hose or tub air dome (common in GE top-load washers), disconnected air hose (common in frigidaire top load washers & GE/Frigidaire/Kenmore stacked washer/dryer combo units).

While a simple repair can be done by yourself for a failed inlet valve, usually for $25-$50 in parts/shipping (go to searspartsdirect.com or appliancepartspros.com to look up a replacement fill-valve using your washing machine model number), the water damage potentially caused by the flooding is more important to address.

I recommend contacting your insurance company if there's a bunch of water that flooded your home - the water can cause delayed warping of flooring or cause mold to grow in/beneath your carpets and walls if the water was not immediately noticed and cleaned up (within first few minutes of flooding) - they send out water remediation specialists to dry (if possible), or to repair the damage to your home.

F27 OVERFLOW CONDITION
If the overflow contact on the pressure switch is closed for more than 60 seconds, an Overflow Condition occurs. In an
overflow condition, the door remains locked and the drain pump runs constantly, even if PAUSE/CANCEL is pressed twice and the display is cleared. Turn off hot and cold water faucets and unplug the unit before servicing.
1. Check the drain hose and make sure it is not plugged or kinked.
2. Unplug washer or disconnect power.
3. Check wire harness connections to the drain pump, pressure switch, water inlet value, and Central Control Unit (CCU).
4. Check/clean drain pump filter of foreign objects.
5. Check for drain pump failure.
6. Check the inlet valve for proper shut off.
7. Check the pressure switch for proper operation.

you probably disconnected the pressure switch or pressure hose when you moved.   i would start with those..

A quick test to split up your possible trouble makers:
Let the washing machine fill with water and when the washer is about 1/2 full of water unplug the washers power cord from the wall outlet. If the water keeps flowing into the washing machine with the power cord pulled the fill valve ( where the hot and cold hoses are attached to your washer ) has mechanically stuck open and will have to be replaced. If the water shuts off when you remove it's power cord from the wall outlet, try plugging the washer in and out a couple more times and if the water stops each time the fill valve indicates as being good = on to the next trouble makers.
The water level control is responsible for shutting off the power to the fill valve and redirects the power to the timer to start the washing machine running once the correct water level has occurred. The WLC itself could be bad. The WLC uses a hose that the water level pushes air into to tell the WLC what the water level is inside the washing machine...the hose could be pinched, fallen off of the tub spout, has a pin hole, clogged up with calcium or soap curd and the WLC cannot "sense" or "tell" what is happening inside the washer.

This is a fill valve gone out

It looks like that water level sensor needs to be replaced. Basked should never be filled with water. I suggest you to unplug the washer from the wall, turn off the water line to it. Don't try anything with it on your own. It can be very dangerous! Call the repair man.

you need a plumber to come clean out the drain in the wall

keeps filling with water