Chances are it s the pool pump capacitor.
Well pump motor humming.
The pressure tank and well pump should be wired on the same breaker so if you find a label for well or water pump that should be the power shut off for the pressure tank too.
Don t buy a new pump check to see if your capacitor is causing th.
But if your pump was cycling on and off too much or as your installer says blaming you the victim over use i suspect the original installation was improper.
If the pump motor hums but does not start the motor may be seizing may need replacement or a start run capacitor may need replacement.
If the service area of the sump pump experiences wet conditions and the motor in the sump pump hums but there is no lowering of the water level an air lock may be to blame.
Swimming pool pump won t start pump is humming.
See capacitors for hard starting motors note that some pump motor noise including an unpleasant whine or hum is perfectly normal.
Humming pump suggests the motor was burning up perhaps from over use or there could be a failed motor start capacitor.
Once you re sure the power is off to the pressure tank you can test with a non contact voltage tester follow these steps to perform basic.
Pump motor humming and trouble starting.
Worn bearings in the motor shaft can also cause screeching noises when the pump is running.
This commonly occurs if the sump dries out often with exposure of the base.
If the well pump or control switch makes no noise at all just hums or clicks and when the water pump simply does not run these diagnostic questions may help track down and repair the trouble.
Try turning off the pump and priming it manually.