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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 customer services.
Possible cause
Pump chocked up
Loose terminals
Defect fuses
Faulty motor
Tripped overload relay
Incorrectly set trip relay
Thermal overload are influ-
enced 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 mo-
tor/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 thrmal insulation
check motor and fan cover for dirt/dust accumulation and
clean if necessary; check ambient temperature and if
necessary, ensure an ambient temperature
forced ventilation.
check direction of rotation, if necessary
slowly open isolating valve
correct wrong terminal bridging (Y in lieu )
check and correct flange leakages, eventually vent pipe
section
raise inlet pressure, ensure minimum required inlet pres-
sure at suction port, check and if necessary clean suc-
tion-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 lantern and pumphousing.
Clean it, if necessary.
ENGLISH
Remedy
40 °C by
21
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