[Solved] Steambox Karcher SC 1.020 - you can not unscrew the water filler

I found little on the electrode on this subject and unfortunately but stupidity. People want to unscrew. I think it works in such a way that if the pressure inside the water tank prevails then unscrewing is impossible because the lock works.
You can heat the remaining water, then turn off the heat and press the button on the handle to release the steam until the pressure goes down. During this time, the tank cap is unlocked and can be rotated but not twisted. As soon as the steam cleaner has cooled down a little, it will not be possible to rotate the tank cap again.
Does anyone of you have any knowledge how to solve this problem?

Or the blockade broke or the thread was stoned when the last time the cork was unscrewed?
You can cut the cork until you see the cap nut under the socket wrench 27.
If you decide to disarm the cork yourself, I can give you some photo instruction and if not, you can send it to the workshop.

The post proved to be helpful.
On the basis of what the professional advised me from these matters, I took the pliers and unscrewed, it was long unscrewed. I did not damage the cork.
Thank you for your help.