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14 Installation and operating instructions • Medana PE3 • Ed.02/2023-04
9 Maintenance All maintenance work must be carried out by authorised and qualified personnel.
WARNING
Risk of electric shock
Danger from electrical current must be eliminated. Before carrying out
electrical work, the pump must be de-energised (switched off) and pro-
tected against unauthorised restarting. It is recommended to disconnect
the plug.
•No special maintenance required during operation
•Keep the pump clean
•If the pump is deactivated for a long period and there is no risk of freezing, it is best not
to drain the pump.
In the event of prolonged absence, be sure to cut off the mains water supply and protect
the installation from freezing.
10 Faults, causes and remedies WARNING
Risk of electric shock
Danger from electrical current must be eliminated.
Before carrying out electrical work, the pump must be de-energised
(switched off) and protected against unauthorised restarting.
It is recommended to disconnect the plug.
Faults Causes Remedies
Motor does not start Thermal protector If the motor is overheated, it doesn’t operate.
Then, wait till getting cold (usually take about
20~30 min.)
Faulty cord connection Insert the power plug securely
Cord disconnected or damaged Replace the cord
Trouble in the motor Repair or replace the motor
The voltage of the power supply to the pump is
too low
Check the voltage of the power supply and con-
sult with the local power supplier
The pump is running but there is no
output flow
Water level in well is lower than standard level Check the water level in well
Trouble in check valve Take off the check valve case and then, clean the
valve, valve seat and valve hole
Air drawn into suction pipe Check for leaks in the entire pipe up to the pump
and seal when any leaks found
Air drawn into pump from mechanical seal Replace the mechanical seal
Thermal protector for the motor
works too often
The voltage of the power supply to the pump is
too low or high
Check the voltage of the power supply and con-
sult with the local power supplier
Impeller is contact with other parts Repair the defects
Short or open circuit of the capacitor Repair or replace the capacitor
Water does not come out at the
first few minutes after switch on
Air drawn into suction pipe Check for leaks in the entire pipe or replace the
defective piping (to prevent air leaking)
The pump starts though no water is
being used
Water leaks at piping or pump Repair piping, pump parts and faucets etc.
Water leaks at mechanical seal Replace the mechanical seal
Trouble in check valve Take off the check valve case and then, clean the
valve, valve seat & valve hole
Defacement or transformation of the impeller Replace the impeller
If you cannot remedy the fault, please contact Wilo customer service.