English
16 WILO SE 09/2008
10 Faults, causes and remedies
Only have faults remedied by qualified personnel!
Observe safety instructions in 9 Maintentance.
If the fault cannot be remedied, please contact
the trade or your nearest Wilo-After-sales
Service or agent.
11 Spare parts
Spares should be ordered through local trade out-
lets and/or the Wilo-After-sales Service.
To avoid queries and incorrect orders, all the data
on the name plate must be indicated when order-
ing.
Subject to change without prior notice!
Fault Cause Remedy
The pump does not start or stops
during operation
Current supply interrupted Check fuses, cables and electrical
connections.
Motor protection switch has tripped Allow the pump to cool down, it will start
again automatically
Fluid temperature too high Allow to cool down
Pump silted up or blocked Disconnect the pump from the mains and
remove from the shaft.
Remove the suction strainer and rinse the
suction strainer / impeller under running
water
Pump does not switch on/off
Float switch blocked or cannot move freely Check float switch and ensure mobility
Pump does not pump
Air in the installation cannot escape Place the pump at an angle in water briefly
until the air escapes.
Vent the installation / drain if necessary
Check the switch-off level
Water level below the intake port If possible, submerge the pump deeper
(observe the switch-off level)
Pressure pipe / hose diameter too small
(losses too high)
Bigger dimensioning of the pressure pipe /
hose diameters
Non-return valve sticking in the pressure
port
check function
Hose kinked / check valve closed Clear kink in hose / open check valve
Flow rate drops during operation
Suction strainer blocked / impeller blocked Disconnect the pump from the mains and
remove from the shaft.
Remove the suction strainer and rinse the
suction strainer / impeller under running
water.
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