Last updated: October 2026
A failing well pressure switch shows up as a pump that won't turn on, won't turn off, or clicks and chatters on and off. The switch reads system pressure and tells the pump when to start and stop — commonly at settings like 30/50 or 40/60 psi. When its contacts burn, its sensing tube clogs or it's set wrong, the pump behaves erratically. Because a pressure switch is a low-cost part we carry on the truck, it's one of the best-case answers to a "no water" call.
What Does a Pressure Switch Do?
It sits near the pressure tank. When pressure drops to the cut-in setting, it closes and starts the pump. When pressure reaches cut-out, it opens and stops the pump. If the switch fails, the pump either never gets the signal or never gets told to stop.
What Are the Signs of a Bad Pressure Switch?
- No water and the pump isn't running, though the breaker is on.
- Pump won't shut off even when pressure is normal.
- Chattering or rapid clicking at the switch.
- Pressure outside the normal range on the gauge.
Some of these overlap with other problems — read why won't my well pump shut off?
Why Do Pressure Switches Fail?
Burned or pitted contacts from years of cycling, insects or debris inside the housing, a clogged sensing tube from sediment or minerals, and freezing. A waterlogged pressure tank also wears switches out faster by making the pump cycle constantly.
Can You Replace a Pressure Switch Yourself?
We don't recommend it. The switch carries line voltage — often 240 volts — and the settings need to match your pump and tank. Texas also requires well work to be done by a licensed contractor; Legacy Water Well is TDLR-licensed (#60520KP). Verify any contractor on TDLR's water well program page.
Frequently Asked Questions
How long does a pressure switch last?
It depends on how often the pump cycles and on water quality. Frequent cycling from a bad tank shortens its life.
Can a pressure switch be adjusted instead of replaced?
Sometimes, if the switch is healthy and just set wrong. We test it before deciding.
Do you fix this same day?
Usually, yes — switches are stocked on our trucks. See well pump repair.
No water or a chattering switch? Call 817-374-2548 or get your free quote. Serving Springtown, Decatur and all of North Texas.