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.
18 WILO SE 09/2014
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 run-
ning 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 pres-
sure 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 run-
ning water
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