On Tuesday, 17 December 2019 14:46:27 UTC, Graham. wrote:
Help me out here. I thought I knew how a door interlock works and I
suppose the PTC thermistor could overheat and cause a fire, but I
can't see how the load of the main heating element influences it.
Does anyone know what the actual mode of faliure is?

https://www.bbc.co.uk/news/business-50811686
https://youtu.be/O9zfue1NzGU

Door interlock interrupts power to, among other things, the main heating element. So if it has deteriorating contacts, it will burn.


NT