How to Troubleshoot Deep Well Pump Systems

Deep well pump systems are designed for wells more than 25 feet deep. A pipe leading from the impeller housing pushes water to the jet located in the well. The jet creates a vacuum which draws the water up a second pipe to the pump on the surface and then through to the plumbing system. Basic preventive troubleshooting can reveal such problems as defective pressure switches, suction line leaks and clogged impellers.

Deep well pump systems draw water from depths of more than 25 feet.
  1. Disconnect the power to the well pump, and clean the pressure switch contacts if the motor fails to operate. Wipe the contacts clean with an emery cloth. Check the household electrical box for breakers that may have tripped. Reset the breakers, if necessary. Replace blown fuses with others of the same rating. Replace the pressure switch if it is damaged in any way or if the points have become welded together. Check the motor for loose or disconnected wires.
  2. Remove the tubing to the pressure switch, and check it for clogs if the motor will not run. Blow through the tubing to remove clogs. Replace the tubing if it is cracked or damaged.
  3. Check that all the connections on the suction line are secure and free of leaks if the motor operates but delivers no water. Switch off the power, and verify that sufficient water is in the priming hole. Rub soapy water over the suction line connections. If you notice bubbling, replace the connection or lines.
  4. Remove the pump, and clean debris from the intake screen if the pump motor tends to run too long.
  5. Inspect the impeller for clogs. The impeller has rotor blades and pulls water through the pump and into the suction line. Remove the pump housing, and clean out the impeller. Ensure that impeller is securely connected to the shaft. If the shaft is broken, have a service technician replace it.
  6. Provide proper ventilation to the pump if the unit overheats. Temperatures of more than 100 degrees Fahrenheit can cause an overload to trip the power. Move the pump to a cooler location, if necessary.
  7. Check for an air lock in the suction line if the pump operates, but the water delivery is low or slow. Inspect the horizontal piping between the well and the pump. The piping should pitch upward from the well toward the pump. Rearrange the piping to prevent air locks.
  8. Check the volume control and connected tubing for leaks. Tighten the fittings and replace the volume control, if necessary.

Things You Will Need

  • Emery cloth

About the Author

Ross Glyn began writing for film and television in 1986. He wrote and directed the film “After The Rain” as well as the play “Soweto's Burning.” He is a member of the Writers Guild Of America, the Screen Actors Guild and the American Federation of Television and Radio Artists. Ross holds a performer's degree from the London Academy of Music and Dramatic Art.

Photo Credits

  • Water well, Romania image by Oren Sarid from Fotolia.com