Section 13: Troubleshooting; Pump And Motor Problem Analysis - Pentair Pentek Series Electronic Manual

SECTION 13: Troubleshooting

13.1 Pump And Motor Problem Analysis

Problem Possible Cause
Pump Won't Start. No voltage (check
with voltmeter).
Typically will be no
startup noise.
Locked pump.
Overloads Trip. Low or high voltage.
Hi gh ambient
temperature or direct
sunlight.
In correct pump sizing –
mismatched motor.
High cycling rate.
Damaged motor control.
Fu ses Blow or Short or Ground.
Breaker Trips.
Improper sizing.
Lo w or No Water No rotation.
Production.
Restriction in piping.
Plugged inlet.
Check And Restore
1. Main power supply off.
2. Blown fuse or tripped circuit breaker.
3. Wiring damage, loose connection.
4. Burnt contactor points.
1. Check for sand in system.
2. Crooked well (submersible)
1. Check with voltmeter. (±10% of nameplate voltage). Request
power company correct problem.
2. Determine if wire size is correct for voltage and amperage.
1. Improve cooling for motor and controls.
2. Use ambient compensated overloads.
1. Check pump (gpm) make sure near B.E.P. - "Best Efficiency
Point".
2. Recheck pump and motor model numbers prior to installation.
Keep a written record.
1. Pressure control equipment malfunction.
2. Hole in piping system.
3. Pressure/storage tank failure.
Check components per troubleshooting.
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).
3. Disconnect power and check with ohmmeter or megohmmeter
to ground.
Consult manufacturer's information / sizing chart for proper size
and replace as required.
1. Motor not turning (see "Pump won't start" above.
2. Broken shaft coupling. Ammeter will show "low" amps.
1. Check valve sticking.
2. Check valve installed backward.
3. Broken check valve poppet or flapper lodged in piping system
downstream.
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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