@jay_s_uk
The testpart is that big that the cooling fan did not even start yet.
It will turn on beginning at layer 2
M303 T0 220 i will try. I believe it was M303 H1 220 I've tried!
Ok and the socks I have and will put it on again!
I will report again.
Thanks a lot
Hi there
Today I've tried all the suggestions you gave...but no changes at all 
But you wouldn't believe what I found!
Jens55 wrote about the cable issue. So finally I tried another file to print, a much smaller part as the other
which I first had that issue.
All printing went well. PID on H1 worked just perfect.
As a conclusion I believe there is a problem with the heater cable within the nice cable drag chain.
Most probably the cable is somewhere broken or overstretched, whatever!
So tomorrow evening I change this cable and give it another trial.
Stand by.
Anyway guys thanks a lot for your help. One way or the other, I've lerned a lot.
Regards Martin
Hi
Today I replaced this faulty cable and everything works fine!
It is unbelievable but a fact!
Thanks to all of you guys for the support.
Have a great time!
Regards Martin