After reading Swordriff his link about the maintenance guide and how to disassembly the nozzle I saw the note about the warranty issue's from the dealer. I decided to get in contact with my dealer first. She told me that there is no warranty on wear and tear parts. So if I disassembly the print head carefully it wont be a problem from the warranty if suddenly the headed bed will fail.
I followed this guide for removing the nozzle, thank you swordriff:
http://support.3dverkstan.se/article/25-removing-the-ultimaker-2-nozzle
When I disassembled the print head, I found the nozzle and it looked like it survived the apocalypse. In the red circle is I most likely my problem. I disassembled to nozzle with care and no outraged force was used
http://i.imgur.com/cMKwkEJ.jpg
I didn't feel cleaning up this mess, so maybe a new nozzle was more likely. But I changed my mind when I saw the price of a new nozzle. I found a ultrasonic cleaner in the office so I tried to clean up the metal parts in this machine. They are still bathing now.
http://i.imgur.com/qCo7bPI.jpg
The thermocouple still needs to be replaced. I contacted my dealer with my new issue and they send me a new thermocouple for free, thank you makerpoint.nl for this good service. I hope that I will receive my new sensor soon!
I'll keep you up to date!