Hi Sven,
You can read into this topic, i think it should give you some help:
If you are unsure, you can post some pictures of your signal cabe (the red yellow black wires).
Are your thermocouple and cartridge heater not interfering with eachother at the hot end?
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Daid 306
It indicates you have a problem with the temperature sensor. Double check if the yellow and red wire on top of the head are screwed in tightly, and the 3 point cable connection is firmly attached.
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