How do you test a capacitor on a well pump?

Turn a multimeter to the “Ohm” setting. Touch the multimeter’s probes on the capacitor’s terminals and watch the meter’s reading. The meter should reach infinite, fall back slightly, then reach infinite again. If it does not, then replace the capacitor.

How do you test a well pump with a multimeter?


What causes well pump capacitor to fail?

Overheating is a primary cause of a failed start capacitor. Start capacitors are not designed to dissipate the heat associated with continuous operation; they are designed to stay in the circuit only momentarily while the motor is starting. If a start capacitor stays in the circuit too long, it will overheat and fail.

What happens if capacitor fails in water pump?

If a run capacitor fails, the motor can display a variety of problems including not starting, overheating, and vibrating. A bad run capacitor deprives the motor of the full voltage it needs to operate correctly.

How can you tell if a capacitor is bad?

How to debug a well pump that is not working (Bad Capacitor)

Can a water pump work without a capacitor?

The motor will run fine without the capacitor. However, the problem comes if the motor stops and tries to restart. Say for instance you have a power blip for a second or two. The pump will shut down and not be able to restart, therefore ruining the motor.

How can I tell if my well pump is bad?

How To Tell If Your Well Pump is Going Bad

  1. 1) Decrease in Water Pressure.
  2. 2) Air Spitting From the Faucet.
  3. 3) Pumping Sand or Sediment.
  4. 4) Water Quality Change.
  5. 5) Water Pump Cycles On and Off Constantly.
  6. 6) Loud or Unusual Noises.
  7. 7) High Electric Bills.

How do I test a capacitor with a multimeter?

To test the capacitor with a multimeter, set the meter to read in the high ohms range, somewhere above 10k and 1m ohms. Touch the meter leads to the corresponding leads on the capacitor, red to positive and black to negative. The meter should start at zero and then moving slowly toward infinity.

How do you test a well pump motor?

How to Troubleshoot Submersible Motors with Your Ohmmeter

How long does a well pump capacitor last?

Answer: A well pump capacitor can last for about 30 years or so. But it’ll require routine maintenance. You also need to replace some of its parts every 3 years.

How long does a pump capacitor last?

Think – A pool pump capacitor generally has a lifetime rating of around 5,000 starts. While 5,000 sounds like a large number, it can go by very fast. So think about when you got your pump, give it a rough estimate. If you only use your pump once a day, 5,000 start is approximately 10-13 years.

How long does a well capacitor last?

Like with everything in life, a capacitor has a lifespan as well. In general, you can expect most AC capacitors to last about 20 years. This is a fairly long lifespan, which is why most heating and AC repair companies will take a look at the capacitor last. They expect the capacitor to last for quite some time.

Does a well pump have a capacitor?

Your well pump might not be able to start at times due to a faulty capacitor. This is quite similar to when the AC doesn’t turn on because of a blown capacitor. If you keep trying to turn on your well pump, it will worsen the situation.

Can a motor run without a capacitor?

Answer: There are three common types of single-phase motors named capacitor motor, shaded pole motor and split phase motors. Shaded pole and split phase single-phase motors do not require a capacitor to run.

What is the difference between a run capacitor and a start capacitor?

The start capacitor creates a current to voltage lag in the separate start windings of the motor. The current builds up slowly, and the armature has an opportunity to begin rotating with the field of current. A run capacitor uses the charge in the dielectric to boost the current which provides power to the motor.

What happens when a motor capacitor goes bad?

A bad motor capacitor may cause starting problems or could shut off the motor while running. Motor capacitors store electrical energy for the motor to use. The higher the capacitance of the capacitor the more energy it can store.

How do you test a capacitor on a water pump motor?


  1. Adjust the multimeter tool to measure Ohms.
  2. Hold either the black or red multimeter lead against either of the capacitor leads.
  3. Monitor the resistance measurement on the multimeter tool.
  4. Identify failed capacitors.

Why does a pump need a capacitor?

The purpose of the start capacitor is to cause the voltage applied to the start winding to be out of phase with the voltage coming from the power source. This phase change gives the motor increased torque when starting.

What does a well pump capacitor do?

Control box capacitors play an integral role in your submersible well pump system. They are responsible for starting up or running the motor. Over time, the well pump capacitors wear out, lose capacitance, and need replacing.

How do you fix a water pump that is not pumping water?

Check the breaker or fuse box.

Inspect your breaker box and see if the breaker has tripped, and if it has, then reset it and you should restore power to the pump. If the breaker trips again, then there is an electrical or mechanical issue with the water pump, which will require a professional plumber.

How do I reset my well water pump?

Hold the reset lever in the start position until the pressure builds up and the gauge reads over 40 PSI; then let it return to the AUTO position. The pump should now run on its own and continue until the pressure reaches the cut out setting, (usually between 50 – 60 PSI), and then shut off.

How do you diagnose a well problem?

Diagnosing Pump and Well Problems

  1. Common Symptoms.
  2. No water. The most basic problem, of course, is no water in the house.
  3. Sputtering water.
  4. Cloudy or muddy water.
  5. High utility bills.
  6. Poor tasting (or smelling) water.
  7. Pressure switch problems.
  8. Pulling and Replacing a Pump.

How do you check if the capacitor is working or not?

How to Test a Capacitor with a Multimeter and LCR Meter

How many ohms should a capacitor have?

A normal capacitor would have a resistance reading up somewhere in between these 2 extremes, say, anywhere in the tens of thousands or hundreds of thousands of ohms. But not 0Ω or several MΩ. This is a simple but effective method for finding out if a capacitor is defective or not.

How do you test a capacitor with a cheap multimeter?

How to measure capacitance

  1. Use your digital multimeter (DMM) to ensure all power to the circuit is OFF.
  2. Visually inspect the capacitor.
  3. Turn the dial to the Capacitance Measurement mode.
  4. For a correct measurement, the capacitor will need to be removed from the circuit.
  5. Connect the test leads to the capacitor terminals.

Is there a reset button on my well pump?

Well Pump Restart. (This is how you turn the water back on)

How do you troubleshoot a deep well pump?

Start by checking that the well switch located near your pressure tank hasn’t been switched off. Then check the well’s double-pole circuit breaker to see that it hasn’t tripped. If it has, reset it. A breaker that keeps tripping likely means a problem with the well pump, and you’ll need to call a pro for that.

How many ohms should a well pump have?

According to the manual the MAIN winding should have a reading of between 3.0 and 3.6 ohms between the YELLOW and BLACK wires, which are the main winding readings. The START windings are the reading between the YELLOW and RED wires. The range should be between 10.7 and 13.1 ohms.

Hi, I'm Nam Sun-Hi. My first name means: "One with a joyful demeanor." I'm a Korean student and author at I spend all my time either writing or studying. I love learning new things, and I think that's why I enjoy writing so much - it's a way of learning more about the world around me.