Fault
Cause / Measure
Fan does not
No mains voltage.
switch on.
Check whether the mains
fuse has failed. Switch on if
necessary.
Impeller blocked.
Fan does not
switch on.
Should only be carried
out by a trained
electrician: Remove
cover [6]. Unlock internal
grille [5.1] or internal
shutter [5.2] using locking
hooks (see arrow) and
remove. Check impeller
and clean if necessary.
Fan does not
Overrun time
switch off.
(max. 25 minutes).
Wait for the overrun time
and reduce if necessary,
see Chapter 8.5.
Motor's thermal
Motor too hot.
overload
protection
cooled. Cool-down time can
switches the
be up to 10 minutes. Unit
fan off.
switches back on automa-
tically after cooling.
Lamella do not
Lamella very dirty or
open or close
blocked.
for K units.
Clean lamella.
Check whether there
is anything between the
lamella. Remove if
necessary.
Wait until the motor has
12. Dismantling
Danger to life from electric
shock
Dismantling may only be
DANGER
undertaken by an electrician.
Switch off mains fuse before
removing.
Danger of burning due to
contact with bimetal (K units).
Bimetal [5.3] is very hot after
CAUTION
fan is switched off. Do not
touch.
up to 10 minutes.
Unlock covers (see arrow) and remove.
Remove electronics cover [4] (3 latches).
Remove power cable.
Remove fan.
13. Disposal
Do not dispose of in domestic
i
waste.
The unit contains in part material that
can be recycled and in part
substances that should not end up as
domestic waste.
Dispose of the unit once it has reached the
end of its working life according to the
regulations valid where you are.
GB
Cool-down time can be
19