How to fix a flooded washing machine drum and replace its water inlet valve

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BEFORE YOU START

Make sure to close the water supply and to unplug the washing machine after activating its pump (see below).
The below intervention can be done with the only use of a screwdriver and multipurpose pliers available at any home.

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What causes the drum of a washing machine to get flooded when not in use?

It's the washing machine water inlet valve that does not close properly and lets the supply water go inside the drum, flood it, and overflow up to the floor. This is the cause of a washing machine drum that is found flooded when not in use, meaning in between washing cycles.
This is not the cause of a washing machine that overflows while in use and which could have any of its water pump filter or drainage pipe or both clogged with debris, pieces of fabric, etc.

1- Context and preparatory works

1- This machine gets flooded when not in use. Its controlled inlet valve is not closing which lets the water flow in and up to the floor.

2- Turn off the water supply then manually activate the pump to get the rid of the water in the drum.

3- Unplug your machine.

2- Reaching and removing the washing machine inlet valve

Everything is below the machine cover which is to be removed prior to any intervention.
Find the two screws that hold it from the back, remove them then slide it to the back or pull it up (depending on machine)

The solenoid valve (electrically controlled valve) is located where the water hose is connected.
Unscrew and remove the hose, and proceed as shown:

1- Unscrew and remove the water supply hose.

2- This is what the solenoid valve looks like.

3- Unplug the connecting wires.

4- Use your pliers to remove the hose clip. This is the hose connecting the valve to the detergent drawer.

5- Pull the hose out. If it is stuck, use a screwdriver to take it out of its connector.

6- Rotate the valve counter clockwise and remove it.

3- Testing the washing machine valve and buying a replacement

Check the filter exists, remove it and blow the valve in both ways.
If it is easy to blow air, its seal got shrunk and the valve needs replacement.
If it is not, some scale could have built up yet it is not advised to attempt cleaning it with vinegar if the machine is more than 7 years old.
You need to buy a new solenoid valve.

Finding an exact match is not always possible. In this case, the new valve mounts using screws instead of rotating it into its opening.

4- Completing the flooded washing machine repair

Insert the new valve in its opening, fit the screws and tighten them, reconnect the drawer's hose, refit its clamp and connect the wires.