Troubleshooting
9-2 WILO EMU 3.0
Fault: Machine runs but
does not pump
Fault: The machine runs,
but not at the stated op-
erating levels
Impeller/propeller impeded by adhesive mate-
rial, blockages and/or solid matter, increased
current consumption
Switch off the machine, secure it against
being switched on again and free the impeller/
propeller or clean the suction port
The pumped fluid is too dense Contact the manufacturer
Cause Remedy
Table 9-2: The motor starts, but the motor protection switch triggers shortly after start-up
Cause Remedy
No pumped fluid Open the container intake or sliders
Intake blocked
Clean the intake, slider, suction port or intake
strainer
Impeller/propeller blocked or obstructed
Switch off the machine, secure it against
being switched on again and free the impeller/
propeller
Defective hose or piping Replace defective parts
Intermittent operation Check the control panel
Table 9-3: Machine runs but does not pump
Cause Remedy
Intake blocked
Clean the intake, slider, suction port or intake
strainer
Slide in the discharge line closed Fully open the slide
Impeller/propeller blocked or obstructed
Switch off the machine, secure it against
being switched on again and free the impeller/
propeller
Incorrect direction of rotation Replace 2 phases on the mains supply
Air in the system
Check the pipes, pressure shroud and/or pump
unit, and bleed if necessary
Machine pumping against excessive pressure
Check the slide in the discharge line, if neces-
sary open it completely, use a different impel-
ler or contact the factory
Signs of wear Replace worn parts
Defective hose or piping Replace defective parts
Inadmissible levels of gas in the pumped liquid Contact the factory
Two-phase operation
Have a specialist inspect the connection and
correct it as necessary
Table 9-4: The machine runs, but not at the stated operating levels
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