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2VV.
Creating innovative solutions for you and your business since 1995.
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 conne
-
cted 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 ex
-
haust 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 fai
-
lure
Unit is working
Defective air quality sensor
Check that the quality sensor is connec
-
ted correctly or check that it is operating
correctly (output signal value)
33 - Failure in the recircula
-
tion relative humidity sensor Unit is working
Defective relative humidity
sensor
Check that the humidity sensor is conne
-
cted 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 correct.
Check that the sensor in the BMS system
is working.
35 - Failure in the REK an
-
tifreeze protection relative
humidity sensor
The unit is ventilating
the permission to
use preheating
Defective relative humidity
sensor
The communication cable to the relative
humidity sensor is damaged or disco
-
nnected. 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.
