Use a non-contact voltage tester to confirm that the power is indeed off at the switch housing before you proceed. For homes relying on a well system, this often points to the heart of the operation: the well pump and its integral control component, the pressure switch.
Pressure Switch Testing Guide Well Pump
Additionally, you should relieve the system pressure by opening a faucet inside the house until the pump stops and no more water flows. Most modern pressure switches feature a small nut and bolt configuration that allows you to adjust the cut-in and cut-out pressures.
Locate the main power supply for the well pump circuit—usually a dedicated breaker in your electrical panel—and turn it off. Inconsistent or absent readings point to a faulty internal mechanism.
Pressure Switch Testing Guide Well Pump
When you close the faucet and pressure reaches the upper limit, it instructs the pump to stop. Because it handles this constant electrical cycling, it is prone to wear, misadjustment, or failure, making it a primary suspect when the system malfunctions.
More About How to check pressure switch on well pump
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