INSTALLATION
Troubleshooting
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ENGLISH
f Disconnect the 6-core common cable for the pressure sensor
and temperature sensor. Four cores of the cable are connect-
ed to the pressure sensor connection. Two cores of the cable
are connected to the temperature sensor connection.
f Remove the supply air fan from the appliance.
D0000065184
1
2
1 Connection for the fan control cable
2 Connection for the fan power cable
f At the front of the exhaust air fan, disconnect the 3-core
power cable and the 4-core control cable.
f At the back of the exhaust air fan, disconnect the 6-core com-
mon cable for the pressure sensor and temperature sensor.
Four cores of the cable are connected to the pressure sensor
connection. Two cores of the cable are connected to the tem-
perature sensor connection.
f Remove the exhaust air fan from the appliance.
f Clean the fans with a soft brush.
Refitting the components
f Push the fan units back into the appliance.
f Turn the eccentric bolts under the fan units clockwise by
300°. The slot at the front of the eccentric bolts must be
horizontal.
f Reconnect the fan cables.
f Slide the heat exchanger back into the appliance.
f To ensure that the support bar pushes the partition under the
heat exchanger, tighten the wing screw until finger-tight. The
top three gaskets must be in contact with the heat exchanger
and become slightly deformed.
f Fit the inner front panel which ensures the appliance is air-
tight. Secure the inner front panel with seven screws.
f Hook the front panel into the hooks provided at the front of
the appliance.
f Secure the front panel with the screws at the top.
f Push the filter drawer into the appliance. The clean side of
the filters must face down.
f Hook the fascia into the appliance.
Checking the condensate drain
Note
The appliance will only function correctly if the conden-
sate drain is working and is filled.
f Check the condensate drain at regular intervals – at
least once every six months.
Cleaning the air ducts
Air ducts must be checked at regular intervals and cleaned if nec-
essary. Disconnect the air ducts from the appliance or carry out in-
spection and cleaning through the extract air and supply air vents.
15. Troubleshooting
WARNING Electrocution
Disconnect the power supply by unplugging the appli-
ance from the mains before carrying out work inside
the appliance.
WARNING Electrocution
The power cable must only be replaced (for example if
damaged) by a qualified contractor authorised by the
manufacturer, using an original spare part.
Fault (Exxx)
xxx Fault Effect Remedy
--- No fault
present
1
Short circuit
Supply air
temperature
sensor
No control to the comfort
temperature required for
passive houses of at least
16.5°C in the supply air
Isolate the appliance from the
power supply. Check the sensor
cable. Unplug connector X7 from
the electronic assembly. Test the
sensor.
2
Lead break
Supply air
temperature
sensor
No control to the comfort
temperature required for
passive houses of at least
16.5°C in the supply air
Isolate the appliance from the
power supply. Check the sensor
cable. Unplug connector X7 from
the electronic assembly. Test the
sensor.
3
Short circuit
Exhaust air
temperature
sensor
No effect
Isolate the appliance from the
power supply. Check the sensor
cable. Unplug connector X8 from
the electronic assembly. Test the
sensor.
4
Lead break
Exhaust air
temperature
sensor
No effect
Isolate the appliance from the
power supply. Check the sensor
cable. Unplug connector X8 from
the electronic assembly. Test the
sensor.
5
No differen-
tial pressure
sensor Sup-
ply air
To avoid build-up of
negative pressure in the
rooms, the appliance
switches off both fans.
Isolate the appliance from the
power supply. Check the sensor
cable. Check the pressure hoses
for contamination and damage. If
necessary, replace the sensor and
the hose.
6
No differen-
tial pressure
sensor Ex-
haust air
The unit switches off
the exhaust air fan. The
supply air fan remains in
operation.
Isolate the appliance from the
power supply. Check the sensor
cable. Check the pressure hoses
for contamination and damage. If
necessary, replace the sensor and
the hose.
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