32
OIC 12en Edition 08/2016
Operating Instructions
Possible faults
Troubleshooting
Troubleshooting
Possible faults
Faults can have different causes. The following tables list the symptoms of a fault, the possible causes
and measures for troubleshooting.
Troubleshooting
Fault
Cause/Remedy
□
No pump suction
1, 2, 3, 4, 5, 6, 7, 8, 32
□
Delivery rate too low
2, 3, 4, 9, 10, 11, 12, 13, 14
□
Pump runs noisily
2, 3, 4, 6, 10, 12, 16, 17, 18, 19, 20
□
Motor overload
9, 10, 13, 20, 21
□
Uneven delivery rate
2, 3, 4, 6, 10, 12
□
Shaft seal leaks
15, 22, 23, 24, 25, 26, 27
□
Pump has got stuck
28, 29, 30, 31
No.
Cause
Remedy
1
Pump suction line closed
► Check shut-off devices in the suction line and open
them, if necessary.
2
Suction valve or line obstructed
► Check the suction valve and line for clear passage.
3
Suction line or shaft seal leaks
► Check suction line or shaft seal for leaks. Pay
particular attention to leakage at valves and
connection points. If necessary, replace parts.
4
Suction head too high
► Reduce difference of level
- or -
► Reduce pipe length
- or -
► Increase pipe diameter
- or -
► Heat the liquid to reduce viscosity
- or -
► Install filter with greater mesh width. Ensure that
the permissible mesh width is not exceeded, see
"Protecting the pump against soiling", page 15.
5
Level of liquid in the intake container
too low
► Supplement the liquid.
6
Soiling of the filters/strainers
► Clean the filter/strainer.
7
Pump suction capacity reduced by
inadequate wetting
► Fill pump with liquid.
8
Incorrect pump direction of rotation
► Carry out the electrical connection so that the
direction of pump rotation matches that of the arrow
on the flange cover, see "Connecting the motor",
page 17.
9
Differential pressure too high
► Check the system and reduce the differential
pressure.
10
Viscosity of the liquid too high
► Increase the temperature of the liquid
- or -
► Reduce the rotation speed.