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OPERATING AND MAINTENANCE MANUAL
SH SERIES CENTRIFUGAL ELECTRIC PUMP
8. PROBLEM SOLVING
ENG
Caution. Disconnect the pump from the power source BEFORE performing any work,
repair or maintenance on the equipment.
PROBLEMS
The pump does
not run
The pump does
not pump properly
The pump runs
but
no water
The flow reduces
obviously
The motor is over
heating
The pump stops
soon after starting
POSSIBLE REASONS
The voltage is not correct.
Fuse or thermal protector makes the
pump stop running.
Too much high head
Too low water level
Bottom valve not in water
No water
Leakage of inlet pipe
The foot-valve is blocked.
The impeller is corrosive.
The bottom valve is not in the water.
No priming water.
Leakage in suction pipe.
The foot-valve is blocked.
The head is too high.
The water level is too low.
The impeller is serious damage.
Low voltage
or insufficient ventilation in pump
room
Low voltage
or insufficient ventilation in pump
room
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SOLUTION
Check the voltage on the name plate.
Check the fuse or thermal protector.
Check the suitable head.
Check the suction head.
Have the valve in the water.
Fill the pump with water.
Check the suction conditions.
Check the suction height and re-install the pump.
Replace the impeller.
Fill the suction section with water.
Fill the pump with water.
Check the suction conditions.
Clean or replace the foot-valve.
Check the installation height.
Check the suction head and re-install the pump.
Replace the impeller.
Contact the electric power company to supply stable
voltage.
Have good ventilation.
Contact the electric power company to supply stable
voltage.
Have good ventilation.
8
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