Troubleshooting Chart

Symptom

Possible Cause(s)

Corrective Action

Pump won’t

1.

Blown fuse or open circuit breaker

1.

Replace fuse or close circuit breaker. See wire size chart for

start or run

 

 

 

proper break/fuse size

at full speed

2.

Power supply in OFF position

2.

Turn power on

 

 

3.

Incorrect voltage at motor (check volt-

3.

Low voltage

 

 

age with motor running)

 

a. Voltage must be within ± 10% of motor rated voltage.

 

 

 

 

 

 

 

 

Check incoming voltage. Contact power company

 

 

 

 

b. Make certain that voltage of motor matches voltage of

 

 

 

 

power supply. See motor name plate and motor wiring

 

 

 

 

diagrams

 

 

 

 

c. Check wire size from main switch to pump. See wire

 

 

 

 

size chart for correct wire size

 

4.

Loose, broken or incorrect wiring

4.

Rewire any incorrect circuits. Tighten connections, replace

 

 

 

 

defective wires

 

5.

Defective motor

5.

Replace motor

 

6.

Pump hydraulic components clogged/

6.

Replace worn parts or entire pump. Clean parts if required

 

 

worn/damaged

 

 

 

 

 

 

 

Pump oper-

1.

Manual or solenoid valves plumbed

1.

a Check all valves on pump inlet and discharge sides of

ates, but

 

into system restricting flow

 

system to be sure they are opened properly to allow

delivers little

 

 

 

flow to and from the pump

or no water

 

 

 

b. Bleed trapped air in pump which keeps water from

 

 

 

 

 

 

 

 

reaching the pump. (Normally

 

 

 

 

due to closed valve in discharge plumbing)

 

2.

In-line filter restricting flow

2.

Check all in-line filters to be sure they are not plugged or

 

 

 

 

restricted

 

3.

Low line voltage

3.

See low line voltage corrective action (above)

 

4.

Inadequate water supply to booster

4.

Check pressure on inlet side of booster to be sure positive

 

 

pump

 

pressure is maintained to the booster pump

 

5.

Undersized piping

5.

Replace undersized piping

 

6.

Leak on inlet side of system

6.

Make sure connections are tight. Repair leaks as necessary

 

7.

Inadequate, defective or plugged foot

7.

Clean, repair or replace as needed

 

 

valve and/or strainer

 

 

 

8.

Worn or defective pump parts or

8.

Replace worn parts or entire plugged impeller Clean parts if

 

 

pump.

 

 

 

9.

Suction lift too great

9.

Pump should be operated under

 

 

 

 

flooded suction only

 

10.

Pump not primed

10.

Prime pump - Make certain inlet pipe is drawn up tight and

 

 

 

 

pump and pipe are full of water

 

11.

Incorrect rotation, motor running

11.

Reverse motor rotation can occur on three phase units. To

 

 

backwards

 

correct, interchange any two incoming power leads.

 

 

 

 

 

Excessive

1.

Pump not secured to firm foundation

1.

Secure properly

noise while

2.

Piping not supported

2.

Make necessary adjustments

pump in

3.

Restricted inlet line

3.

Clean or correct

 

 

4.

Cavitation (noise like marbles in pump)

4.

a. Reduce speed on direct drive

 

 

 

 

b. Increase inlet pipe size

 

 

 

 

c. Too viscous (material being pumped too thick

 

5.

Worn motor bearings

5.

Replace bearings or motor

 

 

 

 

 

Pump leaks

1.

Worn mechanical seal (leaks at shaft)

1.

Replace shaft (rotary) seal

 

2.

Worn o-ring seals

2.

Replace o-ring seals, located inside both ends of the stainless

 

 

 

 

steel shell

11

FLINT & WALLING, INC. • 95 North Oak St. • Kendallville, IN 46755 • www.flintandwalling.com