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Hello and welcome to just answer my name is ***** ***** I will be the one to assist you. What it sounds like is happening to me is your compressor is low on refrigerant and is going to need to be charged which has to be done by a certified tech onsite.
When these things get low they over heat and come off and on as well as not keeping things as cool because there just isn't enough freon to keep it running like it should.
I will open this up to other experts. I would hate for something to go wrong and mess up the whole system hopefully someone will be along shortly.
You are going to need a Tech to come out and adjust the settings on the pressure switch. If all was good before the screws were adjusted then that is your problem.