[Solved] The hydrophore does not turn off, it works all the time at the same pressure

I have the same problem!
It is a small hydrophore on the plot. 20 l
It pumps up to 2 atm without any intervention and does not turn off.
I had to turn off the power.
Where should I look for the cause?

Moderated By krzysiek7:

3.1.19. Do not send messages on archival topics if this is another question, in particular other than the questioning person. Out of respect for the questioner, create your own topic. You can only add a solution to the problem.
I separated from the topic: https://www.elektroda.pl/rtvforum/topic2739175.html

Thanks for advice! It was the pressure switch's fault.
Nobody touched it before.
I adjusted the relay spring.
She made a larger hole on the hook.
(the hydrophore is already several years old)
So a little bend of the tab solved the problem.