How to Replace a Well Pump Pressure SwitchUpdated: Dec. 01, 2022
Replace a cranky old switch in about an hour
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Replace a faulty pump pressure switch
Photo 1: Shut off the power, then disassemble
Label each wire with tape. Then unscrew the conduit locking ring and pull the wires and conduit out of the switch.
Well Pump Pressure Switch Adjustment
Your well pump gets its marching orders from the switch mounted on the pressure tank. When the switch acts up (and they all do eventually), you’ll see all kinds of strange behavior (pump won’t turn on, turns on erratically or won’t shut off). Replacing the pressure switch is cheap and takes only about an hour. But, if you think it’s your pump that’s acting out then here’s how you can repair your well pump.
Diagnose a cranky switch by rapping on it with a screwdriver handle. If the pump runs (you’ll hear it click) or quits, you’ve nailed the problem. But even if it doesn’t respond, it’s still worth replacing the switch. Replace it with a new one (about $24 at rural home centers and amazon.com).
Switches come in three pressure ranges: 20 to 40, 30 to 50 and 40 to 60 psi. Always replace your switch with one of the same rating (usually printed inside the plastic cover of your old switch). Also buy a new pressure gauge (less than $10) and a 1/4-in. x 6-in. galvanized nipple.
Flip the breaker to the pump switch and check it with a voltage sniffer to make sure it’s off. Then disconnect the wiring (Photo 1).
Close the valve from the pressure tank to the house. Then drain the pressure tank. Next, remove the old switch (Photo 2) and gauge (Photo 3).
Wrap the pipe threads with Teflon tape and reassemble. Install the wiring, close the faucet and repower the pump.
Video: Fixing a Dead Well
Video: Fixing a Well Pressure Tank
Required Tools for this Project
Have the necessary tools for this DIY project lined up before you start—you’ll save time and frustration.
- 4-in-1 screwdriver
- Adjustable wrench
- Non-contact voltage tester
- Pipe wrench