We have suddenly lost pressure from our system. We still get water its just that if more than on source is on we get no pressue. I don't think the pressure switch is working properly because I can't hear it clicking on and off. We still get wate but no pressue. We were previouslyset at 40-60 and now it looks like we get a pretty constant pressure of about 20 to 30. Do you think its the switch or possibly the tank needs air? I know very little about these things.

Any help would be appreciated!