WilTec 50743, Operation Manual, Page: 5 / 6

© by WilTec Wildanger Technik GmbH Item 50743, 50744, 50768, 50769, 50959, 51563, 62134, 62136 Page 5
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Malfunctions of the pump
Engine does not run
Cause Solution
No supply power (voltage) Check voltage.
Pump impeller blocked
– thermo controller has
switched pump off
Dismantle and clean the pump.
Engine does not run Consult a professional electrician.
Pump does not suck in
Cause Solution
Suction valve not in the pumped medium Bring suction valve in the pumped medium.
Pump room without pump medium Fill in pump medium in suction nozzle.
Air in suction line Check if suction line is well sealed.
Suction valve leaking Clean suction valve.
Suction strainer (suction valve) blocked Clean suction strainer.
Max. suction lift exceeded Check suction lift.
Insufficient flow rate
Cause Solution
Suction lift too high Check suction lift.
Suction strainer dirty Clean suction strainer.
Level of pumped medium drops rapidly Place suction valve to a lower level inside the me-
dium.
Pump capacity reduced because of harmful
substances Clean pump and replace worn parts.
Thermo switch switches off pump
Cause Solution
Engine overloaded
– excessive friction due to
foreign particles
Dismantle and clean pump, prevent sucking-in
of foreign particles (filter).
Attention!
The pump must not run dry.