Submersible pumps, timers, control boxes, etc.

The first thing to check with a voltmeter, is the voltage at the meter. Next check voltage at the control box or timer. If no control box , check voltage where cable goes down to pump. If voltage at cable at top of well, check for open/ short on conductors at top of well, likely one or the other, if not check at motor on pump when pulled. Check pump for open/ short or for resistance/impedance. Likely open or short. If in doubt apply voltage to pump. If runs, check cable from pump to top and connections at pump. Voltage normally 230 vac. Occasionally, 115 vac. Timers problems, check voltage at timer. Check switch & motor voltage. Likely find discrepancy in one of previous items. Where a pressure tank exists, it is a 20/40 or 30/50---pressure (psi) on/off. Check pressure in tank --should be around the " cut on " pressure 18 or 28. Most problems are with pressure switch contacts ( replace PS ). Always check voltage at PS first.