When your well pump suddenly stops running, the problem often isn't the pump itself—it's the pressure switch. This small, inexpensive component tells your pump when to turn on and off based on water pressure in your system. Because it's a mechanical switch with electrical contacts, it's prone to wear, corrosion, and contamination. The good news is that pressure switch problems are usually quick and affordable to fix.
Understanding the Click
A healthy pressure switch makes a distinct click when the pressure drops to the cut-in point (typically 30-40 PSI) and another click when pressure reaches the cut-out point (typically 50-60 PSI). If you hear rapid, repeated clicking—often called chattering—this indicates the switch is struggling to maintain contact. The cause is usually burnt or corroded contact points, a failing pressure sensor, or low voltage from the control box.
Burnt Contacts and Electrical Issues
The electrical contacts inside a pressure switch can burn or pit over time, especially if the switch has been chattering or if the pump motor draws higher-than-normal amperage. Burnt contacts create resistance, which generates heat and further damage. If you open the switch cover and see blackened, scorched, or pitted metal contacts, the switch needs replacement. Never attempt to sand or file burnt contacts—this is a temporary fix that creates uneven contact surfaces and will fail again soon.
When the Pump Won't Start at All
If your pressure switch isn't clicking and the pump won't start, test the switch with a multimeter. With the power on, check for voltage across the load contacts when the pressure is below the cut-in point. If there's no voltage, the switch has failed. If there is voltage but the pump doesn't run, the problem is likely the pump motor, control box, or wiring between the switch and pump. Our technicians carry pressure switches for all common well systems and can replace yours on the spot.
For pressure switch diagnosis and replacement across North Houston, call 77 Water Well Inc. at (281) 456-4556.