Ender 3 S1: Nozzle too lowperature error (cause and solution!)

My bed wire is destroyed and the nozzle error still popping up

I got -15 temp error, what should I do for this issue?

Do they do a warranty replacement if you open and diagnose yourself? I would worry they'd accuse you of damaging it by opening the case etc.??

I have this problem with the ender v2 neo..... i dont know what to do. I purchase it 3 weeks ago. Everything worked fine until 1 week ago no the alarm goes off 40 mins up in my prints and destory them everytime. So frustrated

Do you think Is the same thing with the Ender 3 v2?