Spare Parts; Fault: The Unit Does Not Run Smoothly And Is Noisy; Further Steps For Troubleshooting - Wilo Sub TWU 3 Série Notice De Montage Et De Mise En Service

• Replace defective parts
5 Intermittent operation (cycles)
• Check the control panel
9.0.4 Fault: The unit runs, but not at the stated operating
levels
1 Intake blocked
• Clean the intake, slider, intake port or intake strainer
2 Slider in the discharge pipe closed
• Open the slider and constantly monitor the power
consumption
3 Impeller blocked or obstructed
• Switch off the unit, secure it against being switched
on again and free the impeller
4 Incorrect direction of rotation
• Replace two phases on the mains supply
5 Air in the system
• Check the pipelines, pressure shroud and/or hydrau-
lics, and bleed if necessary
6 Unit is pumping against excessive pressure
• Check the slider in the discharge pipe and open it
completely if necessary, use a different impeller or
contact the factory
7 Signs of wear
• Replace worn parts
• Check for solids in the pumped liquid
8 Defective hose or pipeline
• Replace defective parts
9 Inadmissible levels of gas in the pumped liquid
• Contact the factory
10 Two-phase operation
• Have a specialist inspect the connection and correct
it as necessary
11 Excessive decrease in the water table during operation
• Check the supply and capacity of the system, and
inspect the level control settings and functionality

9.0.5 Fault: The unit does not run smoothly and is noisy

1 Unit is running in an inadmissible operation range
• Check the operational data of the unit and correct if
necessary and/or adjust the operating conditions
2 The intake port, strainer and/or impeller is blocked
• Clean the intake port, strainer and/or impeller
3 The impeller is impeded
• Switch off the unit, secure it against being switched
on again and free the impeller
4 Inadmissible levels of gas in the pumped liquid
• Contact the factory
5 Two-phase operation
• Have a specialist inspect the connection and correct
it as necessary
6 Incorrect direction of rotation
• Replace two phases on the mains supply
7 Signs of wear
• Replace worn parts
8 Defective motor bearing
• Contact the factory
9 The unit is installed under mechanical strain
• Check the installation, use rubber spacers if neces-
sary

9.0.6 Further steps for troubleshooting

If the points listed here do not rectify the fault, con-
tact our customer service. They can help you as follows:
• Telephone or written support from customer service
Installation and operating instructions Wilo-Sub TWU 3..., TWU 3-...-P&P
• On-site support from customer service
• Inspection or repair of the unit at the factory
Please note that you may be charged for some ser-
vices provided by our customer support. For more
details, please contact customer service.

10 Spare parts

Spare parts can be ordered from the manufacturer's
customer service. To avoid queries and incorrect orders,
the serial and/or article number must always be sup-
plied.
Technical changes reserved!
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