nozzle not heating

  • H i there
    i've got a Creality 10S PRO for some reasons the nozzle do not longer heat I changed it twice.
    On the display it says the temp is -19°C and sometimes -15°C doesn't make sens.
    Checked on the new brand hot end (I bought and got today) the voltage : it was 0V therefore I think the problem is coming from elsewhere. The bed Temp is OK.
    Anything I can check before moving to change all the electronics ? or may be move to another brand ?
    Help appreciated

    Thx in advance.

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