28
29
2VV.
Creating innovative solutions for you and your business since 1995.
ver.3 29-04-20
Description
Unit's behav
-
iour
Likely problem
Solution
26 - Failure in the
pressure sensor of
the exhaust filter.
Unit is venti
-
lating
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 venti
-
lating
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 cor
-
rectly
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 cor
-
rectly
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 cor
-
rectly
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 cor
-
rectly
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 sen
-
sor failure
Unit is venti
-
lating
Defective air quality sen
-
sor
Check that the quality sensor is connected
correctly or check that it is operating correctly
(output signal value)
33 - Failure in
the recirculation
relative humidity
sensor
Unit is venti
-
lating
Defective relative humid
-
ity sensor
Check that the humidity sensor is connected
correctly or check that it is operating correctly
(output signal value)
34 - Failure in the
sensor of external
temperature from
BMS
Unit is venti
-
lating
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 antifreeze
protection relative
humidity sensor
The unit is
ventilating
the permis
-
sion to use
preheating
Defective relative humid
-
ity sensor
The communication cable to the relative humid
-
ity sensor is damaged or disconnected. The
humidity has exceeded the permitted limit and
the sensor may temporarily measure incorrect
values. Check connected sensors. Its address
settings. Set its address Check that it is not
flooded. Replace if necessary.
36 - B moduli error
Unit is not
working
The unit can not control
the peripherals connected
to Module B
Unable to communicate with module B. Check
whether the communication cable between
motherboards A and B is damaged If necessary,
replace module B
37 - Condensate
pan overflow
Unit is not
working
The level sensor has
detected an extremely
high level of water in the
condenser's pan
Check that the level sensor is connected cor
-
rectly or check that it is operating correctly, or
whether the condensate drain is not clogged,
preventing the condensate from draining cor
-
rectly.
50 - Inlet filter
clogged > 80%
Unit is ven-
tilating
Clogged filter
Filter change recommended
51 - Exhaust filter
clogged > 80%
Unit is ven-
tilating
Clogged filter
Filter change recommended
9. TROUBLESHOOTING
