Pressurestat defect ?

Question

hi, on my astoria argenta automatic 2 head, the security reset on the pressure had tripped after we moved the machine. now a have problems to set the pressurestat. what is the best settings start at 1bar and stop at 2bar ? it seems very hard to set the pressurestat, Is it possible that it's defect ? Or the security reset swich is defect ?Thanks for the advice