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8 Faults, causes and remedies
Faults
Pump does not start
or fails to run
Pump runs at
reduced capacity
Pump makes noise
If the fault cannot be remedied, please contact your local plumbing and heating specialist or WILO cu-
stomer services.
Possible cause
Pump cocked up
Loose terminals
Defect fuses
Faulty motor
Tripped overload relay
Incorrectly set trip relay
Thermal overload are
influenced by
excessive ambient
temperature
Tripped PTC-relay
incorrect rotation
Discharge valve throttled
too far
Speed too low
Air in suction pipe
insufficient inlet
pressure
Faulty motor bearings
Impeller scratches
switch off power supply, take-off pump head,
remove obstruction; if motor blocked, overhaul/
exchange motor/pump head
tighten all terminals
check fuses, change defect fuses
call service
throttle hydraulic flow rate down to nominal at
discharge side of pump
reset thermal overloads to name plate FLC-value
reposition overload relay or protect by thermal
insulation
check motor and fan cover for dirt/dust accumula-
tion and clean if necessary; check ambiet tempera-
ture and if necessary, ensure and ambient tempera-
ture ≤ 40 °C by forced ventilation.
check direction of rotation, if necessary
slowly open isolating valve
correct wrong terminal bridging (Y in lieu V)
check and correct flange leakages, eventually
vent pipe section
raise inlet pressure, ensure minimum required inlet
pressure at suction port, check and if necessary
clean suction-side isolating valve and strainer
Arrange for pump to be inspected and,
if necessary, to be repaired by Wilo or other
authorized service.
Test the contact between motor and lantern and the
contact between lantern and pumphousing.
Clean it, if necessary.
Controll the fitting surface of the coupling and the
shaft and clean and oil it, if necessary.
ENGLISH
Remedy
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