WilTec 50588, Operation Manual, Page: 6 / 7

© by WilTec Wildanger Technik GmbH Item 50588 and others Page 6
http://www.WilTec.de
http://www.aoyue.eu 09 2021 -1
http://www.teichtip.de
Cleaning
The heating oil pump must be cleaned only by using mild cleaning agents as well as a damp cloth and
soapy water. Damage caused by inappropriate cleaning agents is not covered by warranty.
Maintenance
Attention! Before every maintenance work the pump must be switched off, pull out the plug from
the power socket.
•
The pump is maintenance free. However, for a long operation life, we recommend regular
checking and servicing.
•
After long non-operation periods, check if the rotor turns properly.
Troubleshooting
Engine does not run
Causes Solutions
No supply power (voltage). Check voltage.
Pump impeller blocked
– thermo controller has
is deactivated pump
Disassemble and clean pump.
Engine not running Consult a professional electrician.
Pump does not suck in
Cause Corrections of malfunctions
Suction valve not inside the pumped medium Bring the 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 untight Clean suction valve.
Suction strainer/valve blocked Clean suction strainer.
Max. suction lift exceeded Check suction lift.
Insufficient flow rate
Cause Corrections of malfunctions
Suction lift too high Check suction lift.
Suction strainer is dirty Clean suction strainer.
Level of pumped medium drops rapidly Place suction valve more deeply.
Pump capacity reduced because of harmful
substances Clean pump and replace wearing parts.
Thermo switch shuts down pump
Cause Corrections of malfunctions
Engine overloaded
– excessive friction through
foreign particles
Disassemble and clean pump, prevent suction
of foreign particles (filter).
Attention! The pump must not run dry.