Troubleshooting Chart - HP Pressure Booster Pumps 0306 Operating Instructions And Parts Manual

Troubleshooting Chart

Symptom Possible Cause(s)
Pump won't 1. Blown fuse or open circuit breaker
start or run
at full speed
2. Power supply in OFF position
3. Incorrect voltage at motor (check volt-
age with motor running)
4. Loose, broken or incorrect wiring
5. Defective motor
6. Pump hydraulic components clogged/
worn/damaged
Pump oper- 1. Manual or solenoid valves plumbed
ates, but into system restricting flow
delivers little
or no water
2. In-line filter restricting flow
3. Low line voltage
4. Inadequate water supply to booster
pump
5. Undersized piping
6. Leak on inlet side of system
7. Inadequate, defective or plugged foot
valve and/or strainer
8. Worn or defective pump parts or
pump.
9. Suction lift too great
10. Pump not primed
11. Incorrect rotation, motor running
backwards
Excessive 1. Pump not secured to firm foundation
noise while
2. Piping not supported
pump in
3. Restricted inlet line
4. Cavitation (noise like marbles in pump)
5. Worn motor bearings
Pump leaks 1. Worn mechanical seal (leaks at shaft)
2. Worn o-ring seals
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Corrective Action
1. Replace fuse or close circuit breaker. See wire size chart for
proper break/fuse size
2. Turn power on
3. Low voltage
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. Rewire any incorrect circuits. Tighten connections, replace
defective wires
5. Replace motor
6. Replace worn parts or entire pump. Clean parts if required
1. a Check all valves on pump inlet and discharge sides of
system to be sure they are opened properly to allow
flow to and from the pump
b. Bleed trapped air in pump which keeps water from
reaching the pump. (Normally
due to closed valve in discharge plumbing)
2. Check all in-line filters to be sure they are not plugged or
restricted
3. See low line voltage corrective action (above)
4. Check pressure on inlet side of booster to be sure positive
pressure is maintained to the booster pump
5. Replace undersized piping
6. Make sure connections are tight. Repair leaks as necessary
7. Clean, repair or replace as needed
8. Replace worn parts or entire plugged impeller Clean parts if
9. Pump should be operated under
flooded suction only
10. Prime pump - Make certain inlet pipe is drawn up tight and
pump and pipe are full of water
11. Reverse motor rotation can occur on three phase units. To
correct, interchange any two incoming power leads.
1. Secure properly
2. Make necessary adjustments
3. Clean or correct
4. a. Reduce speed on direct drive
b. Increase inlet pipe size
c. Too viscous (material being pumped too thick
5. Replace bearings or motor
1. Replace shaft (rotary) seal
2. Replace o-ring seals, located inside both ends of the stainless
steel shell
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