13
10. Fault Finding Chart
Before maintenance or repair disconnect the pump
from the power supply to avoid accidental starting of the
pump!
Fault Cause Remedy
Motor does not start.
Fuses blow or motor
starter trips out imme-
diately.
Caution:
Do
not start again!
•
Supply failure; short-
circuit; earth-leakage;
fault in cable or motor
winding
•
Have the cable and
motor motor
checked and re-
paired by a qualified
electrician
•
Fuses blow due to use
of wrong type of fuse
•
Install fuses of the
correct type
•
Impeller blocked by
impurities
•
Clean the impeller
•
Level switch out of
adjustment or defec-
tive
•
Check the level
switch
Pump operates, but
motor starter trips out
after a short while
•
Low setting of thermal
relay in motor starter
•
Set the relay in ac-
cordance with the
specifications on the
pump label
•
Increased current
consumption due to
large voltage drop
•
Measure the voltage
between two motor
phases. Tolerance:
± 10% (± 5% for ex-
plosion-proof
pumps)
•
Impeller blocked by
impurities. Increased
current consumption
in all three phases
•
Clean the impeller
Pump operates at be-
low-standard
•
Impeller blocked by
impurities
•
Clean the impeller
performance and power
consumption
•
Wrong direction of
rotation (only 3 Ph-
pumps)
•
Check the direction
of rotation and pos-
sibly interchange
two phases (see
section 6.5.)
Pump operates, but
gives no liquid
•
Discharge valve
closed or blocked
•
Check the dis-
charge valve and
possibly open
and/or clean
•
Non-return valve
blocked
•
Clean non-return
valve
•
Air in pump
•
Vent the pump
Pump starts and stops
running in short periods
•
Float switch has
changed his position
or is defect
•
Proof the position of
the float switch or
replace the float
switch
WEEE Notice
The Directive on Waste Electrical and Electronic Equip-
ment (WEEE), which entered into force as European law
on 13th February 2003, resulted in a major change in the
treatment of electrical equipment at end-of-life.
The purpose of this Directive is, as a first priority, the pre-
vention of WEEE, and in addition, to promote the reuse,
recycling and other forms of recovery of such wastes so
as to reduce disposal.
The WEEE logo on the product or on its box indicates that
this product must not be disposed of or dumped with your
other household waste. You are liable to dispose of all
your electronic or electrical waste equipment by relocating
over to the specified collection point for recycling of such
hazardous waste. Isolated collection and proper recovery
of your electronic and electrical waste equipment at the
time of disposal will allow us to help conserving natural
resources. Moreover, proper recycling of the electronic
and electrical waste equipment will ensure safety of hu-
man health and environment. For more information about
electronic and electrical waste equipment disposal, recov-
ery, and collection points, please contact your local city
centre, household waste disposal service, shop from
where you purchased the equipment, or manufacturer of
the equipment.
