13 Fault rectification
14
Change the air filter when the following condition
applies:
• ER-A: Bar indicator is filled completely (red).
• ER-AK, ER-AH, ER-AB: LED on the lower side
of the housing flashes red.
ER-A
1. Change air filter.
2. Remove used TimeStrip.
3. Stick on a new TimeStrip.
4. Press activation button.
ð
The red dye in the interior of the bar is re-
leased. The bar indicator first fills slightly.
Within the next 6 months, the bar indicator will
rise to the upper edge (indicator value 6).
ER-A, ER-AH, ER-AB
1. Change air filter.
2. Press <RESET> button for 2 seconds.
ð
The filter change interval is reset. The LED
flashes briefly 1x.
12.3 Filter change, second room
19 Protective grille
20 Filter mat
21 Adapter
Filter change interval every 6 months, de-
pending on the degree of soiling.
1. Pull the protective grille forwards.
2. Take out filter mat and replace it.
3. Insert new filter mat into protective grille, then
press protective grille into correct position on
adapter until it audibly engages.
Filter mats ZRF: Pack of 5, filter class G2 in
accordance with EN 779, art. no. 0093.0923
13 Fault rectification
Fault finding and repairs only permissible
when carried out by qualified electricians.
Fault
Cause → Measure
Fan performance inad-
equate.
Dirty filter. → Replace
filter.
Locking hook not en-
gaged. → Engage fan
insert correctly.
Incorrect duct diameter.
→ Check diameter of
the main duct.
Supply air cross section
is too small. → Increase
the supply air cross
section.
No fan overrun.
Connect the fan as per
the wiring diagram.
Fan doesn’t start up.
Check whether the fan
insert is correctly inser-
ted.
Fan is too loud.
Dirty filter. → Replace
filter.
Fan insert incorrectly in-
stalled. → Fit fan insert
correctly.
The main duct is dimen-
sioned too small.
Re-calculate pressure
losses.
Additional consumers
connected to terminal 4.
Damage to the unit if
connected incorrectly.
Do not connect addi-
tional consumers to ter-
minal 4.
The unit may only be
connected according to
the wiring diagrams
(Wiring diagram).
If the fault persists or reoccurs: Disconnect the
unit completely from the power supply. Let a qual-
ified electrician determine the cause of the fault
and eliminate it. If you have any question relating
to troubleshooting: Service: +49 7720 6940.
14 Spare parts
Spare parts may only be sourced from and
fitted by a specialist installer.