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9.1.5 Fault: The unit does not run smoothly and is
noisy
1.
Unit is operating in an impermissible range
• Check the operational data of the unit and correct
if necessary and/or change the operating condi-
tions
2.
Suction port, suction strainer and/or impeller
clogged
• Clean the suction port, suction strainer and/or
impeller
3.
Impeller stiff
• Switch off the unit, secure it against being
switched back on again and free the impeller
4.
Impermissible gas content in the fluid
• Consult the plant
5.
2-phase operation
• Have a specialist inspect the connection and
correct it as necessary
6.
Incorrect direction of rotation
• Replace 2 phases of the mains supply
7.
Signs of wear
• Replace worn parts
8.
Defective motor bearing
• Consult the plant
9.
Unit is installed under tension
• Check installation, use expansion joints if
necessary
9.1.6 Further steps for troubleshooting
If the points listed here do not rectify the fault,
please contact customer service. Customer ser-
vice can provide the following assistance:
• Telephone or written support from customer
service
• On-site support from Wilo Customer Service
• Inspection or repair of the unit at the factory
Please note that you may be charged for some
services provided by our customer service! Cus-
tomer service can provide more precise informa-
tion on this.
10 Appendix
10.1 Spare parts
Spare parts can be ordered from the manufactur-
er's customer service. To avoid return queries and
incorrect orders, the serial and/or article number
should always be supplied.
Subject to change without prior notice!
20
APPENDIX
WILO SE 12-2017 DIN A4
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