WilTec 50753 - Page 6

© by WilTec Wildanger Technik GmbH Item 50753, 50757, 50758, 50760 Page 6
http://www.WilTec.de
http://www.aoyue.eu 09 2021-1
http://www.teichtip.de
Attention! Before every maintenance, the pump must be switched off; to do so, disconnect the
pump from the power supply.
• Before a long period of non-use, the pump must be rinsed thoroughly with water, completely
emptied, and stored in a dry environment.
• In case of frost danger, the pump must be completely emptied.
• After long non-operation periods, check if a proper turning of the rotor takes place; to do so,
shortly switch the pump on and off.
• In case the pump is blocked, connect the pressure line to the water line and remove the suction
hose. Open the water line. Switch on the pump for several times for approx. 2 s. Thus, block-
ages can be cleared in most cases.
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.
Pump does not suck in
Cause
Solution
Suction valve not in the pumped medium
Bring suction valve in the pumped medium.
Pump room without water
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.
Water level drops rapidly
Place the suction valve more deeply.
Pump efficiency reduced due to harmful sub-
stances
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.