43 44
Fault
Cause Remedy Observations
a) Motor-protective circuit breaker does not
do contact or motor winding is defective.
d) Low pump suction compared to the water
temperature. Leak in the pipe and flow.
e) Suction pipe partially blocked by impuri-
ties.
a) Suction pipe/pump blocked by impurities.
b) Foot or non-return valve blocked by
impurities.
c) Foot or non-returnvalves blocked in open
position or partially open.
4. Motor-protective circuit
breaker has not tripped
but the pump does not
run.
5. The pumped fluid does
not flow regularly
7. Pump runs in the
opposite direction when
switched off.
6. Pump runs but discharg-
es no water.
b) Improve system and
increase the water which
reaches the pump.
b) Defective control circuit.
a) Suction pipe too small.
b) Not enough water at the suction inlet.
c) Lower fluid level.
c) Leakage in suction pipe.
d) Air in suction or pump.
a) Leakage in the suction pipe.
b) Foot or non-return valves are closed.
d) There is air in the suction pipe.
a) Replace the motor- protec-
tive circuit breaker.
e) Check and remove impuri-
ties.
a) Check and clean suction
pipe.
b) Check and clean the foot
or non-return valve.
c) Check and repair suction
pipe.
d) Refill with fluid and extract
air.
a) Check and repair the suction
pipe.
b) Check and repair food or
check valves.
c) Check and repair the food
valve.
d) Check, repair suction pipe
and bleed the air.
d) Improve the system and
try to increase the suction
pressure.
b) Check the control circuit.
a) Lengthen intake pipe.
c) Try to increase fluid level.
Installation, Operation and Maintenance Manual Installation, Operation and Maintenance Manual
7. TROUBLESHOOTING
Fault
Cause Remedy Observations
a) Leakage in the suction pipe.
c) Refill fluid and extract air.
e) Check and repair the pump.e) Pump mechanically blocked.
d) The ratio between impulsion head of the
system and the impulsion head of the
pump is very low.
8. The pump vibrates and
generates too much noise.
a) Check and repair the suction
pipe.
b) Lengthen or check the inlet
pipe.
d) Improve the system or
choose another pump model.
b) Suction pipe/pump too small or blocked
by impurities.
c) There is air in the suction pipe or in the
pump.
In case e), the users
do not dismantle the
pump by themselves.
● Clients will not be notified when this manual is upgraded but they will be able to download it from Hydroo’s website.
● Pumps are covered by one-year guarantee under normal operating conditions. Wearable parts are not covered by
the guarantee.
● Users will be responsible for any damages caused to the pump due to the dismantling of the pump by themselves
within the warranty period.
● For any further information, please, contact your local distributor.
8. IMPORTANT NOTICE
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