37
Description
Unit's be
-
haviour
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 humidity
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 humidity
sensor
The communication cable to the relative hu-
midity 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.
50 -
Supply
filter
clogged > 80%
Unit is ven-
tilating
Clogged filter
Filter change recommended
.
51 -
Extract
filter
clogged > 80%
Unit is ven-
tilating
Clogged filter
Filter change recommended
.
70 - Anti-freeze
protection of the
water heat ex
-
changer
Unit is venti
-
lating
The anti-freeze protection
of the water heat ex
-
changer is active
The automatic protection of the water exchanger
has been activated in order to prevent damages
due to low air temperature. This is an autono
-
mous function and will be terminated once the
risk of frost
nonexistent
.
71 - Water heater
- waiting for water
temperature
Unit is venti
-
lating
The unit controls the tem-
perature of the liquid in
the exchanger
The automatic process that assess the water
temperature in the exchanger to activate
the next steps is in progress
.
9. TROUBLESHOOTING
