en Faults, causes and remedies
92 WILO SE 2019-10
⇒ See “Fault: Mechanical seal leakage, sealing chamber control reports a fault
and switches the pump off”.
Fault: Pump starts up, motor protection trips after short period
1. Motor protection switch set incorrectly.
⇒ Have the adjustment of the trigger checked and corrected by a qualified elec-
trician.
2. Increased power consumption due to major voltage drop.
⇒ Have the voltage of individual phases checked by a qualified electrician. Con-
tact the electricity distribution network.
3. There are only two phases at the connection.
⇒ Have the connection checked and corrected by a qualified electrician.
4. Excessive differences in voltage between the phases.
⇒ Have the voltage of individual phases checked by a qualified electrician. Con-
tact the electricity distribution network.
5. Incorrect direction of rotation.
⇒ Have the connection corrected by a qualified electrician.
6. Increased power consumption through jammed hydraulics.
⇒ Clean the hydraulics and check the inlet.
7. The density of the fluid is too high.
⇒ Contact customer service.
Fault: Pump runs, there is no volume flow
1. There is no fluid.
⇒ Check the inlet, open all gate valves.
2. Inlet clogged.
⇒ Check the inlet and remove clogging.
3. Hydraulics jammed.
⇒ Clean the hydraulics.
4. Pipe system on the pressure side or pressure hose clogged.
⇒ Remove clogging and replace the damaged components if necessary.
5. Intermittent operation.
⇒ Check the switching system.
Fault: Pump starts, duty point is not reached
1. Inlet clogged.
⇒ Check the inlet and remove clogging.
2. Slide valves on the pressure side closed.
⇒ Completely open all gate valves.
3. Hydraulics jammed.
⇒ Clean the hydraulics.
4. Incorrect direction of rotation.
⇒ Have the connection corrected by a qualified electrician.
5. Air cushion in the pipe system.
⇒ Vent the pipe system.
⇒ If air cushions occur frequently: Locate and prevent the air intake, if required
install ventilation systems at specified locations.
6. Pump pumping against excessive pressure.
⇒ Open all gate valves on the pressure side completely.
7. Signs of wear on the hydraulics.
⇒ Have the components (impeller, suction port, pump housing) checked and re-
placed by customer service.
8. Pipe system on the pressure side or pressure hose clogged.
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