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Resetting a Pressure Switch
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Low pressure cutoff switches are very common additions to residential pumping systems. These switches require manual resetting, and knowing how to do this can save the homeowner a service call. Below is the guide to resetting a Square-D low pressure cutoff switch.
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How To Reset a Square D FSG-2-M4 switch (or equivalent)


Low Pressure cut off switches or M-4 switches are an inexpensive
way to help protect your water well pump from running dry. However
they are not fool proof. One of the most common over the phone repairs
we do is how to reset this switch. Some of the causes of the switch
being tripped are:

  • Pressure dropped due to home using too much water at one time
  • Pressure dropped due to power outage
  • Pressure dropped due to water line breakage
  • Pressure dropped due to low water in well


Basically, any time your pressure drops 10 psi below the cut-in pressure,
the switch will trip. To reset the switch you must hold the lever (see
figure B) on the side of the switch up at about a 30 degree angle to
restart the pump. If the switch makes an audible "click" the lever is too
far. Hold the switch in the on position until the pressure builds back
up high enough to reset. The pressure can be read on the pressure gauge
usually mounted next to the pressure switch (see figure c).



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Site maintained by Jason G. Fegel. Created by John O'Brien on 1/12/01, updated 07/01/04