It monitors the water pressure in the system and signals the pump to turn on or off based on pre-set cut-in and cut-out pressures, typically 30/50 or 40/60 PSI. Locate the main power supply for the well pump circuit—usually a dedicated breaker in your electrical panel—and turn it off.
How a Pressure Switch Operates in a Well Pump System
The reading should change from open (no continuity) to closed (continuity) as the switch activates when you manually cycle the pressure. With the power still off, remove the switch cover to access the terminals.
Also, check the small air fill valve on the pressure tank—similar to a tire valve—to ensure the tank is properly charged, as an incorrect air charge places extra stress on the switch. Use a non-contact voltage tester to confirm that the power is indeed off at the switch housing before you proceed.
How a Pressure Switch Operates in a Well Pump System
Few things in a home are as unsettling as a sudden drop in water pressure or the silence of a faucet that should be running. Visually inspect the connection points for any signs of burning or discoloration.
More About How to check pressure switch on well pump
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