30
31
2VV.
Creating innovative solutions for you and your business since 1995.
ver.5 5-05-20
9. REMOVING FAULTS
Description
Unit's behavi-
our
Likely problem
Solution
32 - Air quality sensor
failure
Unit is venti-
lating
Defective air qua-
lity sensor
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 sen-
sor of external tempe-
rature from BMS
Unit is venti-
lating
Defective sensor
in BMS or inco-
rrectly received
data
Check that the address and values of the sen-
sor in the BMS system are correct. Check that
the sensor in the BMS system is working.
35 - Failure in the
REK antifreeze pro-
tection relative humi-
dity sensor
The unit is
ventilating
the permi-
ssion to use
preheating
Defective relative
humidity sensor
The communication cable to the relative
humidity sensor is damaged or disconnected.
The humidity has exceeded the permitted
limit and the sensor may temporarily measu-
re incorrect values. Check the connection of
the sensor. 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 peri-
pherals 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 le-
vel of water in the
condenser's pan
Check that the level sensor is connected co-
rrectly or check that it is operating correctly,
or whether the condensate drain is not clo-
gged, preventing the condensate from drai-
ning correctly.
50 - Inlet filter clo-
gged > 80%
Unit is venti-
lating
Clogged filter
Filter change recommended
51 - Exhaust filter
clogged > 80%
Unit is venti-
lating
Clogged filter
Filter change recommended
70 - Anti-freeze pro-
tection of the water
heat exchanger
Unit is venti-
lating
The anti-freeze
protection of the
water heat ex-
changer is active
The automatic protection of the water exchan-
ger has been activated in order to prevent
damages due to low air temperature. This is an
autonomous function and will be terminated
once the risk of frost disappears. f
71 - Water heater
- waiting for water
temperature
Unit is venti-
lating
The unit controls
the temperature
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
72 - Water heater -
waiting for supply air
temperature
Unit is venti-
lating
The unit controls
the temperature
of the air flowing
through the ex-
changer
The automatic process that assess the tempera-
ture of the air flowing through the exchanger
to activate the next steps is in progress
