HYDROO VDROO Series, Installation, Operation And Maintenance Manual

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Fault Cause Remedy Observations
1. Motor does not
run when started.
a) Supply failure.
a) Check the power
supply.
b) Fuses are blown. b) Replace fuses.
c) Motor overloaded. c) Check the system.
d) Main contacts in motor-protective
circuit breaker are not making contact
or the coil is faulty.
d) Replace contacts
or magnetic oil.
e) Control circuit is defective.
e) Repair the control
circuit.
f) Motor is defective. f) Replace the motor.
2. Motor-protective
circuit breaker trips
immediately when
power supply is
switched on.
a) Fuses are blown. a) Replacefuses.
In case d) and e),
the user should
not dismantle the
pump himself
b) Contacts in motor-protective circuit
breaker are faulty.
b) Check the motor-
protective circuit
breaker.
c) Cable connection is loose or faulty.
c) Fasten or replace
the cable connection.
d) Motor winding is defective. d) Replace the motor.
e) Pump mechanically blocked.
e) Remove the
mechanical blocking
of the pump.
3. Motor-protective
circuit breaker trips
out occasionally.
a) Motor-protective circuit breaker
setting is too low.
a) Set the motor-
protective circuit
breaker correctly.
b) Defects regular power supply.
b) Check power
supply.
c) Low voltage at peak times. c) Add regulator.
Fault Cause Remedy Observations
4. Motor-protective
circuit breaker has
not tripped but the
pump does not run.
a) Motor-protective circuit breaker does
not do contact or motor winding is
defective.
a) Replace the motor-
protective circuit
breaker.
b) Defective control circuit.
b) Check the control
circuit.
5. The pumped
fluid does not flow
regularly.
a) Suction pipe too small.
a) Lengthen intake
pipe.
b) Not enough water at the suction inlet
b) Improve system
and increase the water
which reaches the
pump.
c) Lower fluid level.
c) Try to increase fluid
level.
d) Low pump suction compared to the
water temperature. Leak in the pipe
and flow.
d) Improve the system
and try to increase the
suction pressure.
e) Suction pipe partially blocked by
impurities.
e) Check and remove
impurities.
6. Pump runs but
discharges no
water.
a) Suction pipe/pump blocked by
impurities.
a) Check and clean
suction pipe.
b) Foot or non-return valve blocked by
impurities.
b) Check and clean
the foot or non-return
valve.
c) Leakage in suction pipe.
c) Check and repair
suction pipe.
d) Air in suction or pump.
d) Refill with fluid and
extract air.
7. Pump runs in the
opposite direction
when switched off.
a) Leakage in the suction pipe.
a) Check and repair
the suction pipe.
b) Foot or non-return valves are closed.
b) Check and repair
food or check valves.
c) Foot or non-returnvalves blocked in
open position or partially open.
c) Check and repair
the food valve.
d) There is air in the suction pipe.
d) Check, repair s
uction pipe and bleed
the air.