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Maintaining a Water Pump

Expert Plumbing & Drain Team

Water pressure

how-to-replace-a-water-pump-repair-switchWater pressure for water-well installations is maintained by a pressure tank installed in the line between the well pump and the residence.

According to your reliable Concord plumbing specialist, pressure t the tank is regulated by an electric switch that turns the pup on when pressure is low and off when the proper tank pressure is reached.  The pressure switch may require periodic maintenance, which we will provide for the homeowner.

Before performing any maintenance steps on a pressure switch, turn off the power to the switch.  The current required to run a well pump is potentially deadly.  Open your beaker box and look for the breaker marked “well” or “pump”.  It may be a single large amperage (30 amp or more) beaker or two lower amperage breakers in tandem.  If you are not sure which breaker is the right one, turn off the main breaker to the house.  (Do not leave the main power to the house off for periods long enough to defrost frozen foods or reduce the heat long enough to freeze pipes.)

If the following maintenance steps do not return the pump to service, replace the switch.


  1. Time: An hour or so to perform routine maintenance and reset pump pressure switch;
  2. Tools: Screwdrivers, emery cloth, pliers, small open-end wrenches;
  3. Skills: Cleaning electrical contact;
  4. Prep: Shut off power to the pump.
  • Turn off the power to the well and locate the pressure switch.  It is likely to have some kind of plastic or metal cover secured with screws.  Unscrew them and lift off the cover.  Set it aside so it won’t get damaged.  (The easiest thing to do in a cramped well house is to step on a switch cover.)
  • If the pump was not operating, pry back the switch relay contacts and inspect them for pitting or burning.  Clean the contacts and perform any necessary pressure adjustments.

Cleaning the contacts

To clean the pressure switch contacts, slide a length of emery cloth between them and pull the cloth across them several times.  Reverse the cloth and repeat the process on the other side until all the contacts (usually eight or more) are shiny.  Use pliers to unscrew an aerator from the end of a faucet spout and clean all the little parts.  Replace the aerator if it is damaged.

Adjusting the switch

Pressure switches are installed in conjunction with pressure gauges, and the switches are set to turn on at low pressure and off at a higher pressure (typically 20 and 40 psi, respectively).  Adjustment instructions usually can be found on the inside of the switch cover.  Use wrenches to turn the adjustment screws, following the manufacturer’s instructions.

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Absolute Plumbing in Concord, CA

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