English (GB)
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8. Fault finding the product
DANGER
Electric shock
Death or serious personal injury
- Before you remove the terminal box
cover and before you remove or
dismantle the pump, make sure that the
power supply has been switched off and
that it cannot be accidentally switched
on.
Faults Causes
A: The pump delivers no liquid.
B: The pump does not deliver enough liquid.
C: The pump does not create enough pressure.
D: The pump loses liquid after running for a short time.
E: The pump consumes too much power.
F: The motor is overloaded.
G: Vibrations.
H: Cavitation noise.
I: The pump bearings are overheated.
J: The pump operates for a short time and then stops. K: Reference numbers to remedies.
ABCDEFGH I J K
●●
The pump is not primed, lack of priming
liquid, incomplete priming.
1
● Loss of priming liquid. 2
● ● ● ● The suction lift or static lift is too high. 3
●●
The outlet pressure is too high
(measured at the outlet port).
4
● ● ● The speed is too low. 5
● ● Wrong direction of rotation. 6
● ● The impeller is completely clogged. 7
● The inlet pipe is partially blocked. 8
● ● ● ● ● Air leak in the inlet pipe or flange. 9
●● ●
Air leak in the stuffing box. The flushing
pipe may be blocked.
10
●●● ●
Cavitation; insufficient NPSH (depending
on installation).
11
● ● ● The impeller or wear rings are worn. 12
● ● Defective packing rings. 13
●
The non-return valve is too small or
partially obstructed. The cross section of
the non-return valve port must be at
least as large as the cross section of the
inlet pipe.
14
●● ●
The inlet pipe is not immersed deeply
enough.
15
●
The impeller diameter is too small. This
is the most probable cause, if none of
the above causes apply.
16
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