Maytag dishwasher MDB-3 fills, runs a few seconds, then stops.

Door Lock Motor and Switch Assembly

The door lock secures the washer door shut during operation. Once the washer door is closed, the washer can begin operating. If the washer door is not latched shut, the door switch will prevent the washer from operating. If the door lock is defective, the washer will not spin or start. The door lock can fail either mechanically or electrically. Inspect the door lock for damage. If the door lock is damaged or does not latch properly, replace it. To determine if the door lock has failed electrically, consult your washer’s wiring diagram and use a multimeter to test each of the door lock switches for continuity. If one of the switches does not have continuity, replace the switch.