47
INSTALLATION & SERVICE MANUAL FOR PROFESSIONALS
Maintenance and care
: Error list
en
A B C
Error
code
Error
Possible cause
Action
required
Reset
11 R
0
E 11
Supply air tem-
perature < +5 °C
Reduced heat
recovery due to
low extract air
temperature
Low temperatures
pulled out of un-
heated rooms
Ensure all ventilated
rooms are heated
Alternatively, close
the dampers in un-
heated rooms
Perform a
manual reset
by pressing the
alarm button on
the control panel
or by switching
the unit on/off
Firmware version
2.9 and up also
has automatic
restart after 600
seconds
Poorly insulated
ducts in cold
environments
Improve duct insula-
tion
Reduced heat re-
covery due to low
exhaust airflow
Clogged extract
air filter
Change filters
Poor balancing of
airflows
Adjust the system
An extract fan in
the bathroom is
creating negative
pressure in the
house
Remove extract
fan from the bath-
room and connect
extract air
from bathroom to
ventilation system
An extract air fan
in the kitchen is
creating negative
pressure in the
house
Ensure that warm
make-up
air can reach the
cooker hood.
If this is not possible,
open a window/door
while the cooker
hood is running
A cooker fan is
creating negative
pressure in the
house
Contact your chim-
ney/stove supplier
for safety precautions
12 R
2
E 12
Overheating
One of the
internal sensors
is measuring a
temperature >
70 °C.
Overtemperature
caused by fire
inside or outside
the ventilation
system
Check ventilation sys-
tem and surround-
ings for fire
The alarm dis-
play can be reset
by pressing the
alarm button or
by turning the
unit off/on.
However, the
unit cannot be
started until the
alarm conditions
have disap-
peared
Overtemperature
caused by the
combination of a
preheater or af-
terheater and too
low an airflow
Check ventilation sys-
tem and surround-
ings for fire
Check which sensor
is measuring a high
temperature. Check if
the airflow is blocked
and if the filters are
clogged.
Raise the minimum
airflow setting if
necessary
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