On Jun 18, 11:40 am, mustang wrote:
We recently lost water pressure from our submersible well. Upon
inspection I found the pressure control switch to be completely
blackened by soot. I assumed a bad switch, so I replaced it. The new
switch cut in fine, but at cutout the switch started arcing rapidly,
followed by a big flash and bang. So that's what happened to the old
switch! Pressure settings are correct, bladder pressure is correct,
tank has been drained, etc., but very rapid cycling at cutout pressure
remains. Any ideas? Bad controller, low water, leak in pipe?

If the air pressure is correct, 1-2 psi less than cut-in setting, with
no water in the tank, then you have serious blockage between the
switch and pump, or an electrical problem.

Do you have any filter or shut off valve before the pressure tank/
switch?

Do you have a control box for the pump, usually on the wall and the
electric line from the switch goes to it and then on to the well/pump?

Are absolutely sure the pressure tank is totally empty of water after
draining it? Wobble it, it should be light and no water above the
bladder sloshing around. You don't get water or water vapor out of it
when you spritz some air out of it?

If no to all that, then call a pump guy, well driller or only a
plumber that can service and pull a submersible pump (most don't/
can't).

Gary
Quality Water Associates