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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
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 exchan-
ger 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 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
temperature 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
progress
Preparation for freecooling mode in
progress. It evaluates the temperature
and the conditions necessary to activate
this mode.
74 – Flow reduction,
minimum
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
protection
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
automatically 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
damaged 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 pro-
cess
37 - Condensate pan
overflow
Unit is not working
The level sensor has de-
tected an extremely high
level of water in the con-
denser's pan
Check that the level sensor is connected
correctly or check that it is operating
correctly, or whether the condensate
drain is not clogged, preventing the
condensate from draining correctly.
