5
Replacing and cleaning the filter
cartridge or fabric filter
• Release the container clips, lift off the
vacuuming assembly, and lay it on its side.
• Loosen the bayonet catch holding the cartridge
filter and remove cartridge filter, or pull off the
fabric filter (Illustration D).
• Cleaning can be done with a soft brush or by
holding the filter under running water
(Illustration E). Let it dry out before using it
again for dry vacuuming.
• Place the vacuum assembly onto the container,
and secure with the clips.
Technical specifications
Voltage
240
V
1~50/60
Hz
Mains fuse (slow)
12
A
Container volume, net
18
L
Water intake capacity
8
L
Blower data
P
MAX
1200
W
P
NOM
1000
W
Air flow rate
68
L/sec
Vacuum
180
mbar
Weight
5.5
kg
Class of protection
II
Mains cable
Type H05VV-F2x1
Sound pressure level
74
dB(A)
Specifications subject to change without prior
notice.
NT 251
English
Wet-vacuuming
Never use this cleaner to vacuum explosive
liquids, acids or solvents.
• The paper filter bag must be removed before
using the cleaner for wet-vacuuming.
• The cartridge or fabric filter must remain in the
unit. Let it dry out before using it again for dry
vacuuming.
• If the container is full, the float closes the inlet,
the suction power is reduced, and the suction
motor runs at a higher speed. When this
happens, switch off and unplug the cleaner
from the mains electricity.
• Hold the hose up high to allow any liquid to flow
into the container.
• Cleaning can be continued as soon as the
container has been emptied.
Emptying the container
• Release the container clips, lift off the
vacuuming assembly, and lay it on its side.
• Within a short period of time wet dirt will start to
decay, therefore empty the container after each
use, and rinse it out with clean water.
Problem
Cause
Remedy
Motor (suction turbine) does
not work
No power supply
Check building fuse, mains
cable and socket.
Suction power drops off
gradually
Blocked filter, nozzle, suction
hose or tube
Check, clean
Suction power drops off
suddenly
Full paper filter bag or
container
Switch off unit, and empty
container. Replace filter bag.
Dust is expelled during
vacuuming
Defective or improperly fitted
filter
Check filter fitting; replace
filter if required
Troubleshooting
