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2VV.
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9. FAULTS REMOVAL
Description
Unit's behaviour
Likely problem
Solution
25 – Room temperature
sensor failure
(T_Room)
Unit is working
Room temperature sensor
failure
Check that the sensor is correctly co-
nnected to the electronics or test it
measuring its resistance (the resistance
value at +20°C is around 10kW)
26 - Failure in the pressure
sensor of the exhaust
filter
Unit is working
Pressure sensor failure
Check the supply point for mechanical
damage or whether it is clogged by dirt,
or whether the supply hoses are free.
The pressure sensor will likely need to
be replaced
27 - Failure in the pressure
sensor of the inlet
filter
Unit is working
Pressure sensor failure
Check the supply point for mechanical
damage or whether it is clogged by dirt,
or whether the supply hoses are free.
The pressure sensor will likely need to
be replaced
28 - Failure in the pressure
sensor of the inlet fan
Unit is not working
correctly
Pressure sensor failure
Check the supply point for mechanical
damage or whether it is clogged by dirt,
or whether the supply hoses are free.
The pressure sensor will likely need to
be replaced
29 - Failure in the pressure
sensor of the exhaust
fan
Unit is not working
correctly
Pressure sensor failure
Check the supply point for mechanical
damage or whether it is clogged by dirt,
or whether the supply hoses are free.
The pressure sensor will likely need to
be replaced
30 - Failure in the pressure
sensor of the VAV
supply channel
Unit is not working
correctly
Pressure sensor failure
Check the supply point for mechanical
damage or whether it is clogged by dirt,
or whether the supply hoses are free.
The pressure sensor will likely need to
be replaced
31 - Failure in the pressure
sensor of the VAV C4
exhaust channel
Unit is not working
correctly
Pressure sensor failure
Check the supply point for mechanical
damage or whether it is clogged by dirt,
or whether the supply hoses are free.
The pressure sensor will likely need to
be replaced
32 - Air quality sensor
failure
Unit is working
Defective air quality sensor Check that the quality sensor is conne-
cted correctly or check that it is opera-
ting correctly (output signal value)
33 - Failure in the
recirculation relative
humidity sensor
Unit is working
Defective relative humidity
sensor
Check that the humidity sensor is co-
nnected correctly or check that it is
operating correctly (output signal value)
34 - Failure in the sensor of
external temperature
from BMS
Unit is working
Defective sensor in BMS or
incorrectly received data
Check that the address and values of
the sensor in the BMS system are co-
rrect. Check that the sensor in the BMS
system is working.
35 - Failure in the REK
antifreeze protection
relative humidity
sensor
The unit is ventila-
ting the permission
to use preheating
Defective relative humidity
sensor
The communication cable to the rela-
tive humidity sensor is damaged or dis-
connected. The humidity has exceeded
the permitted limit and the sensor may
temporarily measure incorrect values.
Check the connection of the sensor. Set
its address Check that it is not flooded.
Replace if necessary.
