I installed a Pumptrol FSG2J21 pressure switch on my well pump and successfully adjusted the CutIn pressure to 40 pounds and the CutOut pressure at 60 pounds. My holding tank pressure is at 38 pounds.
Here's the problem: When it reaches 60 pounds and shuts off, there is a quick decrease in pressure from 60 pounds to 56 1/2 pounds on my pressure guage. No water is running in the house and it "holds" at 56 pounds until someone uses water.
What is happening please? And how can I fix it? Thank you.
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