WilTec 51548, Operation Manual, Page: 7 / 8

© by WilTec Wildanger Technik GmbH Seite 7
http://www.WilTec.de
http://www.aoyue.eu November 2019 Version 2
http://www.teichtip.de
Service notes
Even though this pump is a low-maintenance device, we advise to perform periodic maintenances in
order to prolong the longevity of the pump.
Attention! The pump has to be disconnected from the power supply before any kind of maintenance
work is performed.
Before the pump is being stored or left unused for longer periods of time, it has to be rinsed with water
and then emptied completely and stored within a dry environment.
In case of risk of frost, the pump has to be emptied completely in order to avoid that it or its parts are
damaged.
Check the flawless functionality of the rotor by turning the device on for a few seconds after longer
periods of idleness.
In case of the pump being blocked, connect the pressure line to the water line and remove the suction
hose. Then open the water line and repeatedly start the pump for approximately 2 seconds. In most
cases this should suffice in order remove clogging.
Troubleshooting
The motor does not start
Causes Solutions
Line voltage is missing Check the power supply
Pump impeller jams
– Thermal controller has shut down
Dismantle the pump and clean it
Pump does not suck water in
Causes Solutions
Suction valve is not inside the water Place the suction valve inside the water
No water inside the pump station Fill water into the pump intake nozzle
Air inside the suction line Check the suction line for leakages
Suction valve leaks Clean the suction valve
Suction strainer is clogged Clean the suction strainer
Max. suction head is exceeded Check the suction head
Insufficient flow rate
Causes Solutions
Suction head is too high Check the suction head
Suction strainer is soiled Clean the suction strainer
Water level decreases rapidly Put the suction valve deeper into the water
Pump capacity is reduced by pollutants Clean the pump and replace worn parts
Pump is shut down by thermal controller
Causes Solutions
Motor overloads
– High friction due to foreign
matter
Dismantle and clean the pump, prevent the
suction of foreign matter with a filter
Attention!
The pump must not run dry!