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SECTION 13: Troubleshooting
13.1 Pump And Motor Problem Analysis
Problem
Possible Cause
Check And Restore
Pump Won’t Start.
Novoltage (check
with voltmeter).
Typically will be no
startup noise.
1. Main power supply off.
Locked pump.
1. Check for sand in system.
2. Blown fuse or tripped circuit breaker.
3. Wiring damage, loose connection.
4. Burnt contactor points.
2. Crooked well (submersible)
Overloads Trip.
Low or high voltage.
1. Check with voltmeter. (±10% of nameplate voltage). Request
power company correct problem.
2. Determine if wire size is correct for voltage and amperage.
High ambient
temperature or direct
sunlight.
1. Improve cooling for motor and controls.
Incorrect pump sizing –
mismatched motor.
1. Check pump (gpm) make sure near B.E.P. - “Best Efficiency
Point”.
2. Use ambient compensated overloads.
2. Recheck pump and motor model numbers prior to installation.
Keep a written record.
High cycling rate.
1. Pressure control equipment malfunction.
2. Hole in piping system.
3. Pressure/storage tank failure.
Fuses Blow or
Breaker Trips.
Damaged motor control.
Check components per troubleshooting.
Short or Ground.
1. Fuses give superior protection and should be used in preference
to circuit breakers when possible.
2. Inspect wiring for visible signs of heat damage (discoloration,
damage to insulation).
Low or No Water
Production.
Improper sizing.
Consult manufacturer’s information / sizing chart for proper size
and replace as required.
No rotation.
1. Motor not turning (see “Pump won’t start” above.
Troubleshooting
3. Disconnect power and check with ohmmeter or megohmmeter
to ground.
2. Broken shaft coupling. Ammeter will show “low” amps.
Restriction in piping.
1. Check valve sticking.
2. Check valve installed backward.
3. Broken check valve poppet or flapper lodged in piping system
downstream.
Plugged inlet.
1. Intake screen encrusted with minerals.
2. Insufficient clearance between pump and well casing for high
capacity pump. Calculate intake velocity and limit to less than
5 feet per second.
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