A20M Heating failed, printer halted, please reset

[tnoyer]

Hi there,

I just had my printer a month ago and managed to print everything i've wanted so far.
I am now struggling with printing. I have not changed any settings, I still use Cura to slice with the exact same settings.
When I start the print, the printer goes to the right temperature and start printing.
It always stops approx. 1 minute after it started. When I look at the temperature on the screen while it is printing, the numbers keep changing randomly: it goes like 200-115-195-117-199... The bed temperature is ok though.
Then it just stops and says "heating failed, printer halter, please reset".

Could someone help me figuring out where does the issue come from ? I am very new to this and feel a bit desperate.

Thank you very much

[JBJ97277]

Bonjour j'ai presque le même problème à la différence que moi l'impression a commencé correctement et au bout de 12h elle c'est coupé a 2hde la fin et m'affiche le même défaut mais m'a température de tête indique -14°