EN - 49
9.3 Malfunctions of the CO
2
RF Sensor
Fault
Problem
Solution
After pressing the confirmation
button, the CO
2
LED displays
the CO
2
level. The three LEDs on
the right blink alternately green
and red.
■
The CO
2
Sensor is not yet
paired with a ventilation unit.
■
The installation has not been
completed correctly.
Pair the CO
2
Sensor to the
ventilation unit. Refer to section
4 for the correct installation.
The CO
2
LED flashes red 3
times.
The selected ventilation mode
flashes 3 times. The original
mode is then displayed
continuously.
The CO
2
Sensor is temporarily
disconnected from the
ventilation unit.
1. Remove objects that
may block wireless
communication.
2. Try operating the ventilation
mode again.
The CO
2
LED flashes red
continuously.
CO
2
level is too high.
The sensor tries to increase
ventilation, but there is no
communication.
1. Remove objects that
may block wireless
communication.
2. Ensure sufficient air quality
by opening windows and
doors.
In case of recurring malfunctions, please contact your local Zehnder representative.
9.4 Malfunctions of the CO
2
0-10V Sensor
There are no known malfunctions of the CO
2
010V Sensor. If this does not work, please
contact your local Zehnder representative.
9.5 Unsafe situations
Situation
Safety
Action
Support
The CO
2
Sensor got
wet.
Do not touch the CO
2
Sensor.
1. Switch off the
electricity.
2. Remove the CO
2
Sensor from the wall.
3. Dry all parts.
In the event of damage
to the CO
2
Sensor,
please contact your
local Zehnder
representative.
