18. Fault rectification
41
18. Fault rectification
●
Call on the services of a trained electrician
any time there is a fault.
●
Repairs should only be carried out by a
trained electrician.
DANGER
Danger to life from electric shock.
Prior to accessing the connection
terminals, switch off all supply circuits.
Switch off mains fuse, secure against
being accidentally switched back on and
position a visible warning sign.
Fault
Cause, measure
Fan output
inadequate.
● Dirty filter.
Replace filter.
● Locking hook
not
engaged.
Engage fan insert correctly.
●
Incorrect duct diameter.
Check diameter of the main
duct, refer to diagram in the
catalogue.
● Supply air cross section
is too small.
Increase the supply air
cross section.
VZ, VZ 15,
VZC, GVZC
EC, F, H
and I models:
No fan overrun.
The power on external
conductor L connected to
terminal 1 is interrupted
when the fan is switched off.
Connect the fan as per the
wiring diagram.
VZ, VZ 15,
VZC, GVZC
EC, I models:
Fan starts up
immediately
and stops
immediately if
is switched-off.
Terminals 1 and 3 are
reversed.
Connect the fan as per the
wiring diagram.
Fan doesn’t
start up
Check whether the fan
insert is correctly inserted.
Fault
Cause, measure
Fan is too loud.
● Dirty filter.
Replace filter.
● Fan insert incorrectly
inserted. Insert fan insert
correctly in accordance with
chapter 14.2.
The main duct
is undersized.
Re-calculate pressure
losses.
H model does
not switch from
base load to full
load operation
despite there
being moisture
in the room.
The switch-on point has
been set too high.
Use jumper [S] to set a
lower switch-on point.
H mode no
longer switches
back to base
load operation
or off even after
a long period in
full load
operation.
The switch-off point has
been set too low.
Use jumper [S] to set a
higher switch-on point. The
switch-off point depends on
the corresponding switch-on
point.
Additional
consumers
connected to
terminal 4.
Damage to the unit if
connected incorrectly.
Do not connect additional
consumers to terminal 4.
The unit may only be
connected according to the
wiring diagrams in chap. 22.
GVZC EC:
No start delay /
overrun time
Check jumper positions,
chap. 14.2
If the fault persists or reoccurs:
Disconnect the fan completely from
the mains power supply. Have error
established and rectified by a trained
electrician.
If you have any questions about
troubleshooting: Service:
+49 7720 6940.
