47
2VV.
Creating innovative solutions for you and your business since 1995.
9. FAULTS REMOVAL
Description
Unit's behaviour
Likely problem
Solution
50 - Inlet filter clogged >
80%
Unit is working
Clogged filter
Filter change recommended
51 - Exhaust filter clogged
> 80%
Unit is ventilating
Clogged filter
Filter change recommended
70 - Anti-freeze protection
of the water heat exchanger Unit is ventilating
The anti-freeze protection
of the water heat exchanger
is active
The automatic protection of the water
exchanger has been activated in order to
prevent damages due to low air tempera
-
ture. 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 ventilating
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
72 - Water heater - waiting
for supply air temperature
Unit is ventilating
The unit controls the tem
-
perature of the air flowing
through the exchanger
The automatic process that assess the
temperature of the air flowing through the
exchanger to activate the next steps is in
progress
73 - WCO detects tempe
-
rature of the water supply
(cold / hot)
Unit is ventilating
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
73 - Pre-freecooling active
Unit is ventilating
Temperature evaluation for
freecooling mode in pro
-
gress
Preparation for freecooling mode in pro
-
gress. It evaluates the temperature and
the conditions necessary to activate this
mode.
74 – Flow reduction, mi
-
nimum temperature in the
duct not reached
Unit operates in a
restricted mode
The unit is trying to reach
the set values of the cha
-
nnel's minimum
The temperature of the air flowing into the
inlet branch of the building has not been
reached. The performance of the unit is
being automatically corrected to reach
this minimum level. Automatic process
75 - Passive house protec
-
tion
Unit is not working
The unit is operating in
order to meet the Passive
house specifications
The temperature of the air flowing into the
inlet branch of the building is not within
the Passive House specifications. The
performance of the unit is being automa
-
tically corrected to reach this minimum
level. Automatic process
36 - B module 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 da
-
maged If necessary, replace module B
76 - Heat pump defrost
Unit operates in a
restricted mode
The unit is waiting until the
heat pump defrosts.
The heat pump is reporting that it is
defrosting. The unit is operating in
defrost-waiting mode Automatic process
37 - Condensate pan over
-
flow
Unit is not working
The level sensor has detec
-
ted an extremely high level
of water in the condenser's
pan
Check that the level sensor is connected
correctly or check that it is operating co
-
rrectly, or whether the condensate drain
is not clogged, preventing the condensate
from draining correctly.
