https://www.how-to-repair.com/help/how-a-washing-machine-door-lock-or-interlock-works/
Washing machine door locks really only get 3 major faults
The points between live and common fail in some way.
The NTC heater or bi-metal strip fail.
The plastic gets to hot and distorts inside the lock causing it to jam.
Washing machines must have some way in which you can lock the door closing mechanism when the machine is started up and then unlock them with a certain delay (normally two minutes) after the current has switched off via the program or on/off switch, in order to ensure that the door cannot be opened while some of the components are still rotating initially (in particular the motor and the drum of the spin-dryer).
When you shut the door, the latch on the door pushes inside the door lock onto a sliding bar which moves over and activates an electrical part inside which locks the door shut. At the same time, power is passed through the interlock on to the rest of the machine. The actual latching shut of the door is a simple spring-loaded mechanism where the latch just slips into the door catch and the door stays closed. Locking the door is a separate process.
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