Troubleshooting
8 Troubleshooting
8.1 Pump malfunctions
If malfunctions occur which are not specified in the following
table or cannot be traced back to the specified causes, please
consult the manufa cturer.
Possible malfunctions are identified by a number in t he follow-
ing table. This numb er identifies the respective ca use and rem-
edy in the troubleshooting list.
Malfunction
Number
Pump not pumping 1
Pumpingrateinsuffici ent
2
Pumping rate excessive 3
No pump suction 4
Pump running roughly
5
Pump jammed 6
Pump leaking
7
Excessive motor power uptake 8
Tab. 9 Malfunction/number assignment
Malfunction number
1234
5
6
7
8
Cause
Remedy
X
–––––––
Transpo rt screw plugs s till in place Remove the transport screw plugs.
Dismount the pump and insp ect it for
dry-running damage.
X
–––––––
Supply/suction pipe closed by fitting
Open the fitting.
X
–––
X
–––
Supply/suction pipe not bled properly or not
filled up completely
Fill up the pump and/or pipe completely
and bleed them.
X
–––
X
–––
Formation of air pockets in the supply or
suction pipe
Install the fitting for bleeding.
Correct the piping layout.
X
–––
X
–––
Pressure pipe blocked
Clean the pressure pipe.
X
––
XX
–––
Pump running in t he wrong sense of rotation Swap any two phases on the motor
(→ 5.6.3 Checking the sense of rotation,
Page 17).
X
––
X
–
X
––
Pump very dirty Dismount and clean the pump.
XX
–
XX
–––
Supply/suction pipe, pump or suction
strainer bl ocked or encrusted
Clean the supply/suc tion pipe , pump or
suction strainer.
Clean the
suction strainer.
XX
–
XX
–––
Air is sucked in
Seal the source of malfunction.
XX
–
XX
–––
Excessive amount of gas: Pump is
cavitating
Check the cable gland.
Clean/enlarge the filter.
Enlarge the supply/suction pipe
cross-section.
626.0005 GB – 550 041 BA-2014.01 SPF s eries 25
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