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Switches are used everyday and wear and tear will always take place over time, selector switches are single pole switches and can be anything from 3 to 12 position which enable the multifunction capability.
The switches uses a cam that rotates this moves spring load contacts, as the cam rotates form the user turning the selector different connections are made creating different electrical paths.
The ovens wiring are attached to the rear of the selector switches the terminals used are called amp tags these must be tight if they are lose the create heat this can melt and warp the switches and cams.
The body and cam are made of plastic and the electric connections intentionally are made of brass.
Common issues
As with any switches wear and tear can affect the operation of the switches which can cause the switch to not be able to select or hold certain positions and will mean certain functions may no work as intended.
A worm cam can also affect the contact integrity this will cause the contacts to overheat and the switch can melt if left , this can usually be seen during a visual inspection of the switches
You can test the switches by connecting multimeter leads to the terminal of the switch and testing continuity during operation of the switches. Reading should be very low ohms 0.0ohms
Sometimes the internal contacts can weld shut , this is usually caused by failure of the heating element creating a large circuit current at the moment of failure this will usually cause functions to operate without the switch being on after replacing the element , so ensure you test and visually inspect switches with multi meter after fitting new parts if problems occur.
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