Step 1: Perform a master reset
This is the first thing a person should try. Unplug the washing machine, and leave it this way for about 1 minute. Plug the machine back in, and close the machine door six times in 12 seconds to send a message to the computer to reset everything. It may not work on all washing machines, so consult the repair guide to see if it will work for this particular machine.
Step 2: Fix the lid switch
If the lid switch has become defective, it is necessary to remove it from the machine. Consult the machine's repair guide to see where it is located and how to take it out. See if the switch works when it is used to open and close the machine door. If it does not, the lid switch needs to be replaced.
Step 3: Check the water level control if the machine isn't spinning
Open the control panel, and look for the water level valve. If the plastic tube attached to it appears clogged, vinegar can clear it up. If the switch itself appears corroded, it may be necessary to replace it.
If none of these solutions work, consult the user's guide that accompanied the machine. Parts may need to replaced, or a repairman may need to be called.