Other, pump-specific faults not detectable by
the frequency converter.
English
WILO SE 05/2008
25
9 Spare parts
Spare parts must be ordered from the local
authorised dealer and/or from Wilo after-sales
service. In order to avoid unnecessary inquiries or
incorrect orders, specify at the time of your order
all of the data listed on the name plate.
Subject to technical changes without prior
notice!
Faults
Causes
Elimination
8.1 The pump is
running but does
not pump
anything
8.2 The pump is
vibrating
8.3 The pump does
not provide
sufficient pressure
8.4 The delivery rate
is irregular
a) The pump is not running fast
enough:
b) Interior parts are blocked by foreign
matter:
c) Suction line is blocked:
d) Air intake through suction line:
e) The pump has run empty:
f) The suction pressure is too weak,
cavitation noise is occurring
generally:
a) Poorly mounted to the pedestal:
b) Foreign matter is blocking the
pump:
c) Difficult pump rotation:
a) Insufficient motor speed:
b) The motor is defective:
c) Insufficient pump filling:
d) The drainage screw is not screwed in
all the way:
a) The suction head (Ha) has not been
maintained:
b) The suction line has a smaller circ-
umference than that of the pump:
c) Suction strainer and suction line are
partially blocked:
a) Check correct setting of the nominal values (setpoints)
(matching of the nominal value points).
b) Dismantle pump, replace defective parts, perform
cleaning.
c) Clean the entire pipework.
d) Check the impermeability of the entire pipe up to the
pump and seal.
e) Refill the pump. Check the impermeability of the foot
valve.
f) Excessively large suction pressure losses or excessively
large suction head. (check the Net Positive Suction
Head of the installed pump and of the installation).
a) Check and tighten the nuts on the pedestal bolts.
b) Dismantle and clean the pump.
c) Check whether the pump rotates freely without
encountering abnormal resistance.
a) Check correct setting of the nominal values (setpoints)
(matching of the nominal value points).
b) Have the motor/frequency converter replaced.
c) Open the drain cock of the pump and bleed until there
is a complete absence of bubbles.
d) Check drainage screw and screw in as needed.
a) Consult the installation conditions and recommen-
dations contained in these Installation and operating
instructions.
b) The suction line must have the same diameter as the
suction inlet of the pump.
c) Dismount and clean.
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