Well pressure switch

Inspecting the well pressure switch is an important step in troubleshooting well pump issues. The pressure switch controls the on/off cycling of the pump based on water pressure in the system. Here's a guide on how to inspect the well pressure switch:


Materials Needed

  • Screwdriver
  • Multimeter 

1. Turn Off Power:

Before performing any inspection, turn off the power to the well pump system. Locate the circuit breaker that controls the pump and switch it off.



2. Locate the Pressure Switch:

The pressure switch is typically located near the pressure tank. It is connected to the water line, and there are wires leading from it to the pump and power source.


3. Visual Inspection:

Inspect the pressure switch for any visible signs of damage, such as burns, melted plastic, or loose connections.

Check the electrical connections to ensure they are tight and secure.


4. Pressure Adjustment:

Some pressure switches have an adjustment screw or nut that allows you to set the cut-in and cut-out pressure levels. Consult the manufacturer's guidelines for your specific pressure switch.

Use a screwdriver or wrench to adjust the pressure settings if needed. The cut-in pressure is the pressure at which the pump turns on, and the cut-out pressure is the pressure at which it turns off.


5. Testing with a Multimeter:

If you have a multimeter, you can test the continuity of the pressure switch. Set the multimeter to the ohms setting.


6. Disconnect the wires from the pressure switch terminals.

Place the multimeter probes on the terminals. With the pressure switch in the closed position, the multimeter should read continuity (near-zero ohms). When open, it should read infinite resistance.

If the pressure switch does not change state when the pressure changes, it may be faulty and needs replacement.


7. Replace if Necessary:

If you find any signs of damage or if the pressure switch is not functioning correctly, it's advisable to replace it. Purchase a replacement pressure switch that matches the specifications of your well pump system.


8. Restore Power:

After inspecting or replacing the pressure switch, restore power to the well pump system.


9. Monitor Operation:

Observe the system's operation to see if the pressure switch is now functioning correctly. The pump should turn on when the water pressure drops below the cut-in pressure and turn off when it reaches the cut-out pressure.

If you are unsure or uncomfortable with these steps, consider seeking assistance from a professional well pump technician to ensure a proper and safe inspection and replacement process.