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hot end /nozzle not heating

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Hi there,

I'm facing a tough time with my Creality 10 s PRO.

the hot-end do not heat anymore. Bed is Ok. I got a new hot-end one -> the temp displayed is -19°C, change it today to another one it displays -15°C

I used a multimeter to check whether power id provided. answer is 0 V - (plugged on the two red wires).Therefore I'm thinking that it could come from .... the motherboard?

Is there anything I can check before moving to that expensive option ?

Thx in advance.

A negative temperature displayed means the thermistor is broken. 

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