My refrigerator water line keeps making a sound like it was pumping water to fill the ice tray every few minutes. However, the ice maker was full of ice. I also noticed the same sound every few minutes at the hot water heater. So, I went to the well house and noted the water pipe going from the tank to the house would vibrate as if the pump was running every few minutes. It only lasts about 7 secs.
The contact switch was open, so no current was activating the pump. And the pressure never changed at the pressure gague.
I turned off the water cutoff valve between the tank and the house and the apparent "pumping" activity at the pipe stopped and did not start back again until I opened the water valve again.
What would cause such a thing and how can I get this to stop?