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8
WILO SE 03/2009
10 Faults, causes and remedies
If the fault cannot be remedied, please contact
your local sanitary and heating specialist or WILO
customer services.
11 Spare parts
All spare parts must be ordered through your local
specialist and/or Wilo Customer Services.
In order to avoid returns and incorrect orders, please
specify the name plate data for all orders.
WARNING! Electrical shock hazard
Dangers caused by electrical energy must be
excluded.
All electrical work must be performed after the
electrical supply has been switched off and
secured against unauthorized switching.
WARNING! Risk of scalding
At high water temperatures and system pressure
close isolating valves before and after the pump.
First, allow pump to cool down.
FAULTS
PROBABLE CAUSE
REMEDY
10.1 THE PUMP FAILS TO OPERATE
a) No power:
a) Check the fuses, the wiring, and the
connectors.
b) The thermistor tripping device has
tripped out, cutting off power:
b) Eliminate any cause of overloading of
the motor.
10.2 THE PUMP RUNS BUT PROVIDES IN
SUFFICIENT FLOW AND/OR PRES-
SURE
a) Wrong direction of rotation:
a) Check the direction of rotation of the
motor and correct it if necessary.
b) Pipe obstructed by foreign material:
b) Check and clean the pipe.
c) Parts of the pump are obstructed by
foreign material:
c) Have Customer Service examine the
pump.
d) Air in suction pipe:
d) Make the suction pipe airtight.
e) Suction pipe too narrow:
e) Install a larger suction pipe.
f)
The valve is not open far enough:
f)
Open the valve properly.
10.3 THE PUMP DELIVERS UNEVENLY
a) Air in pump:
a) Evacuate the air in the pump; check
that the suction pipe is airtight.
10.4 THE PUMP VIBRATES OR IS NOISY
a) Foreign material in pump:
a) Have Customer Service remove the
foreign material.
b) Pump not properly attached to its
base-plate:
b) Retighten the anchor bolts.
c) Bearing damaged:
c) Call Customer Service.
10.5 THE MOTOR OVERHEATS AND ITS
PROTECTION TRIPS OUT
a) A phase is open-circuit:
a) Check the fuses, the wiring, and the
connectors.
b) The pump is hard to operate: foreign
material in pump:
b) Have Customer Service clean the
pump.
c) The pump is hard to operate: bearing
damaged:
c) Have Customer Service repair the
pump.
d) Ambient temperature too high:
d) Provide cooling.
