Appendix; Further Steps For Troubleshooting; Spare Parts - Wilo Sub TWU 3 HS Serie Einbau- Und Betriebsanleitung

APPENDIX

9.2.5. Fault: The unit does not run smoothly and is
noisy
1. Unit is operating in an inadmissible range
• Check the operational data of the unit and
correct if necessary and/or adjust the operating
conditions
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. Inadmissible levels of gas in the fluid
• Contact the manufacturer
5. Incorrect direction of rotation
• Change the direction of rotation via the menu.
6. Signs of wear
• Replace worn parts
7. Defective motor bearing
• Contact the manufacturer
8. Unit is installed under tension
• Check installation, use expansion joints if
necessary
9.2.6. Fault: Automatic control of the system not
working
1. Taps are closed, unit continues to run or starts up
again immediately
• Difference between Pmax and Pmin too small,
adjust "Delta P" value in the operating param-
eters
2. Unit constantly switches on and off
• Leakage in the system; check pipework and
remedy leakage
3. Unit does not shut down
• Leakage in the system; check pipework and
remedy leakage
• Non-return valve on the pressure port does not
close properly; switch off unit, secure it against
being switched back on, clean non-return valve

9.2.7. Further steps for troubleshooting

If the points listed here do not rectify the fault,
contact customer service. They can help you as
follows:
• 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
services provided by our customer service.
For more details, please contact customer service.
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
must always be supplied.
Subject to change without prior notice!
Installation and operating instructions Wilo-Sub TWU 3/High Speed
English
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