Troubleshoot: Water Well Pump Does Not Start

Описание: Now we will talk about what to do in the event that the motor does not start:

1. Check for blown fuses and tripped breakers, depending on your home power system, check for blown fuses or tripped breakers to ensure power is getting to the system.

2. Check your power source, be sure to check that power is getting to through to the system, it is recommended that you check voltage at the pressure switch and also the control box, basically you want to check that power is getting all the way through the system and any components that power is running through. I usually will start by checking voltage at the pump control panel and work my way from there. Your voltage needs to be +/- 10% of motor rating. If you find that your voltage is too high/low at the breaker panel you may need contact the power company.

3. Pressure Switch, check your settings on the pressure switch and examine for defects and wear. You may need to readjust the settings, or replace the switch. If you are in a situation where you have hard water, or sediment in the water system the pressure tube can also become clogged so check this as well. Checking the voltage on both sides of the switch is advised, if the contacts are weak the voltage drop may not allow the pump to run. If you encounter this problem and the contacts appear black it may be possible to clean with a wire brush. Make sure the power is off if you attempt this. Otherwise replace the switch.
How to Adjust a Pressure Switch Video:    • How To Adjust a Pressure Switch  
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4. The control box may have malfunctioned, your previous voltage checks may have already led you to this conclusion, but if you would like detailed instructions on troubleshooting your control box we are adding those videos later in this series. But generally speaking, a visual inspection of the components is recommended as often times parts that fail will appear burnt. It is possible to replace individual components inside the panel but the components are expensive so if the box is over 10 years old replacement is recommended.
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5. Another area where problems are common is defective wiring, the most likely spots for this to be a problem is the splice from the motor to submersible cable, the splice at the top of the well that transitions to UF or THHN, then as the wire is spliced once again as it enters the home. If these connections were not sealed properly originally or if improper methods were used corrosion and loose connections can cause severe voltage drop which would cause the motor not to operate. Improperly sealed connections can also cause the motor to trip the breaker if the line shorts.

6. Finally, if everything else seems good, it may be time to replace the pump. Fortunately there are a number of checks that you can perform to determine if the pump or wiring down the well is bad and needs to be pulled from the well. We will go over these troubleshooting methods in part 4 of this troubleshooting series. It is possible for poor connections down the well to cause the motor to appear bad so if you do end up pulling the well check the motor again to be sure it is the pump and motor, not the wiring connection. Replacement of the pump and motor or wire may be necessary, I advise you strongly consider replacing the pump end along with the motor if the pump is older than 5 years and the motor has failed.


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We are a distributor of pumps, packaged pumping systems, on-site wastewater treatment equipment, on-site wastewater treatment systems, and custom electrical control panels for water and wastewater applications, water well supplies, drilling supplies, and water treatment equipment.