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11 - TROUBLESHOOTING
FAULT OR INCONVENIENT
No flow
Insufficient flow rate
Outlet pressure too low
Vibrations or high noise
The engine will not start
The thermal switch intervenes
High absorption
Pag 31 / 48
G.M.P. S.p.A. Via Sale 119/121 – 25064 Gussago (BS) Italy
PROBABLE REASONS
Wrong di
rection
of rotation
Pump not filled with t
he fluid
Presence of air in the pump or in
ipe
the suction p
line
ine
Suction pipel
not enough
immersed
Suction head too raised
Impeller or suction line clogged
Low engine speed
Head of the pumping plant too
hight
See previous points causes
Cavitation functioning. NPSHa
insufficient
Losses from the seals
Demaged impeller
Foot valve too slim
See previous points causes
Outlet line ostructions
See previous points causes
Pump, motor or base not
properly secured
Excessive weight of the pipes
Damaged bearings
Incorrect pump / motor
alignment
Lack of tension
Condenser faulty
The rotating part is blocked
Line cable interrupted
Too high voltage
Grounded or short-circuited cable
The winding is grounded
The rotating part is blocked
Excessive liquid density
Incorrect pump / motor
alignment
Excessive engine speed
Wear or mechanical blocking
Functioning out of performance
curves.
The head is lower than the
minimum head allowed
REMEDY ACTIONS
Verify the rotation of the motor.
Fill the pump and the suction pipe with the fluid
Verify the possible losses of the pipeline. Breathe the
pump in order to get out the air
Increase the immersion of the tube below the liquid
level.
Low the level of the pump
Check suction filter, check impeller and remove
obstructions.
Check the motor rotation speed. For motors powered
by inverter, check the feed frequency.
Check the outlet valves holes. Make a calculation of the
pumping plant and compare it with the one of the
pump. Use a pump with higher head
Icrease the pumping plant NPSHa, reducing the
suction losses, or approaching the pump to the fluid
that has to be aspirated.
Replace the seals
Replace the impeller
REpalce the foot valve
Remove the ostructions
Check the tightening of the fixing screws
Support the piping
REplace the bearings
Check the alignment of the elastic joint
Check power line
Replace the capacitor
Check and remove obstruction
Repair or replace the cable
Check voltage
Repair or replace the cable
Check and if necessary rewind
Check and remove obstruction
Check the density. If necessary, contact the
manufacturer.
Check alignment of the elastic joint
Check the corrispondence between motor speed and
pump.
Check and replace worn parts if necessary (bearings,
impeller, etc.)
Act on the outlet regulation valve to increase the head
and low the flow rate.
File: FiGMP001_Rev.6 Data_01-2023
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