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Faults - Causes - Remedies
Faults Causes Remedies
Pump does not start
- Mains voltage is not applied
- Float switch (
6) does not
switch
- Check mains voltage
- Bring oat switch into higher
position
Pumps has no dis-
charge
- Base (
4) inlet grating
blocked
- Reduces pump performance,
through severely contami-
nated water and additions in
the water which produce a
grinding effect
- Backow stop (
10) is
incorrectly tted or faulty
- Use a water jet to clean the
base inlet grating
- Clean pumps and replace
sealing ring (
13) as nec-
essary
- Check the backow stop’s
connection. Change it if
necessary (see “Maintenance
and Cleaning”)
Pump does not switch
off
- Float switch cannot drop - Set up pumps correctly on the
pit base
Flow rate insufcient
- Base (
4) inlet grating
blocked
- Reduces pump performance,
through severely contami-
nated water and additions in
the water which produce a
grinding effect
- Backow stop (
10) is
incorrectly tted or faulty
- Backow stop (
10) re-
duces pump performance
- Use a water jet to clean the
base inlet grating
- Clean pumps and replace
sealing ring (
13) as nec-
essary
- Check the backow stop’s
connection. Change it if
necessary (see “Maintenance
and Cleaning”)
- Remove the backow stop
from the angle adapter (
11) (see “Start-up”)
Pump switches off
after a short period
- Motor contactor disconnects
the pumps because of water
pollution that is too severe.
- Water temperature too high,
motor contactor breaks
- Pull out power plug and
clean the pump as well as
shaft
- Note maximum water tem-
perature of 35°C!
37


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