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44 WILO SE 07/2014 V4.1
• 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/propeller is
blocked
• Clean the intake port, strainer and/or impeller/pro-
peller
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 Fault: Mechanical shaft seal leak, moisture sensors re-
port a fault or shut down the unit
(Moisture sensor monitoring is optional, and is not
available for all types. For more details, see the order
confirmation or the electrical connection plan.)
1 Condensation build-up due to lengthy storage and/or
temperature fluctuations
• Operate the unit briefly (max.
5 min.) without moisture sensors
2 Expansion tank (optional for polder pumps) is too high
• Install the expansion tank no more than 10 m above
the bottom edge of the intake port
3 Increased leakage when running in new mechanical
shaft seals
• Change the oil
4 Defective moisture sensor cables
• Replace the moisture sensors
5 Mechanical shaft seal is defective
• Replace the mechanical shaft seal and contact the
factory
9.0.7 Further steps for troubleshooting
If the points listed here do not rectify the fault, con-
tact our customer service. They can help you as fol-
lows:
• Telephone or written support from customer service
• 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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