7. TROUBLESHOOTING
FAUL
CHECKS (possible cause)
REMEDY
1. The motor does not
start and makes no
noise.
A. Check the electric connections.
B. Check that the motor is live.
C. Check the protection fuses.
2. The motor does not
start but makes
noise.
A. Ensure that the mains voltage is the
same as the value on the plate.
B. Ensure that the connections have
been made correctly.
C. Check that all the phases are present
on the terminal board. (3~)
D. Look for possible blockages in the
pump or motor.
E. Check the condition of the capacitor.
3. The motor turns
with difficulty.
A. Check the voltage which may be
insufficient.
B. Check whether any moving parts
are scraping against fixed parts.
B. Eliminate the cause of the scraping.
4. The pump does
not deliver.
A. The pump has not been primed
correctly.
B. On three-phase motors, check that
the direction of rotation is correct.
C. The diameter of the intake pipe is
insufficient.
D. Blocked foot valve.
B. If necessary, invert the connection of
two supply wires
C. Replace the pipe with one with a
larger diameter.
D. Clean the foot valve.
5. The pump does
not prime.
A. The intake pipe or the foot valve is
taking in air.
B. The downward slope of the intake
pipe favours the formation of air
pockets.
A. Eliminate the phenomenon and prime
again.
B. Correct the inclination of the intake
pipe.
6. The pump supplies
insufficient flow.
A. Blocked foot valve.
B. The impeller is worn or blocked.
C. The diameter of the intake pipe is
insufficient.
D. On three-phase motors, check that
the direction of rotation is correct.
A. Clean the foot valve.
B. Remove the obstructions or replace
the worn parts.
C. Replace the pipe with one with a
larger diameter.
D. If necessary, invert the connection
of two supply wires.
7. The pump vibrates
and operates noisily.
A. Check that the pump and the pipes
are firmly anchored.
B. There is cavitation in the pump, that
is the demand for water is higher
than it is able to pump.
C. The pump is running above its plate
characteristics.
A. Fix the loose parts more carefully.
B. Reduce the intake height or check for
load losses.
C. It may be useful to limit the flow at
delivery.
B. Correct any errors.
C. If not, restore the missing phase.
D. Remove the blockage.
E. Replace the capacitor.
C.If they are burnt-out, change them.
N.B.If the fault is repeated immediately
this means that the motor is short
circuiting.
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