Here is another photo. It seems to be the sensor cable indeed. There is a black mark on the heater cartridge and it looks fine.
Here another view:
I don't think it's come from the PCB connection, the cable looks damaged before this unmounting and the temperature got down during the cleaning when I was holding the nozzle with pliers.
Thank you for you answer!
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swordriff 119
I would check PCB connection of heater cable. It is attached with screws, or "clips" if your UM2 is very new.
The heater cable is to the right in the photo.
That being said, the sensor cable looks "rotten" too, but hard to tell in photo.
The heater should have ca 23-24 ohm, The temp sensor ca 105-110 at "room" temp.
Try it, to rule them out, or in.
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