Double check that power is running to your well and that there isnt a short. Google the switch manufacturer and see if you can get instructions for adjusting the pressure at which the pump shuts off.
Joe O 39 Neill On Twitter Pressure Switch Turns It On And Off
Well pump pressure switch sticking. Allow the pump to fully cycle by opening a nearby water faucet. If the pump is not creating enough pressure to signal the switch to turn off it is possible the pump could need to be replaced. If you are getting voltage to and from the control box and the pump is silent its time to pull the pump. Pressure switch not turning off. Be wery wery careful not to touch any live parts with the wrench. Adjust the switch for a pressure a bit below the highest pressure the pump can produce.
Check the well tank pressure gauge to see if it is at least 40. Verify that your pump is creating enough pressure to signal the pressure switch to turn off. Do not touch any part of the switch while it is energized. Check the water pump breaker in your electrical box to make sure the breaker hasnt tripped. If the switch opens and closes it may have been temporarily stuck due to debris. The only thing you can really do without pulling the pump is to make sure you are getting voltage between the pressure switch and control box and from the control box to the pump.
You can go to the well and listen for the whir of the pump. Here are a couple things to check. The contacts for the pressure switch for my well stick which causes us to lose water pressure i usually replace the switch once a year because of this but i just replaced the switch four weeks ago. Thats usually a symptom of short cycling or an electrical problem. If the switch fails to close when the pressure drops the internal spring is bad. If it has tripped you will.
What causes the contacts to stick.
Gallery of Well Pump Pressure Switch Sticking
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