Washing machine door lock checking

[tberger]

Is there a way to check if the door lock of the washing machine is damage by connecting two wires in the connector?

The door lock is ZV 446 and it has 3 legs.

Thank you.

 

[fidom]

Usually the 3 wires are:
Live
Switched Live
Neutral

The problem is determining which one is neutral. If you can do that you can bypass the door switch by connecting the 2 live wires together. Sometimes the neutral terminal is labelled "N" but this is rare on modern machines. Sometimes the neutral wire is thinner than the other 2.

 

[tberger]

Thank you very much.

Can you explain what is the function of the wires?
I understand that there are two functions for the switch:
1. To detect if the door is closed.
2. To prevent (with a delay) of opening the door while the machine is working.

How does the connection between Live and Switched live will do a bypass
for the first function?
Is it safe and not going to harm the electronic board?

I found a photo of the switch on the internet and sometimes there is a mark on the connector for the wires: N, C, L.

One more thing is that the colors of the wires are: black, blue, red.

Of course I want to be sure before doing something that may cause damage to the main board.

 

[fidom]

The device contains a small heater and a bi-metal strip, which changes shape when it gets hot and operates a switch plus a locking bar. When the wash cycle is complete the machine turns off power to the small heater but the door stays locked until the bi-metal strip cools down and releases the locking bar. If you suspect the door switch is faulty you can briefly connect the live (L) to the switched live (C) and if the machine starts up like that you know that the fault is narrowed down to the door switching. If you are lucky the machine will then work OK as soon as a new door switch is fitted. If you are less lucky the faulty door switch may have damaged the circuit board. In many such cases this can be repaired by soldering in a wire to replace a burnt copper strip.
If in doubt, just fit a new switch, that sort are not expensive. If you fail to identify the wires correctly and you connect N to L you WILL do damage!