2VV.
Creating innovative solutions for you and your business since 1995.
Description
Unit's behaviour
Likely problem
Solution
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
temperature of intake
air
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 tempera-
ture
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
73/78 - Pre-freecooling
active
Unit is ventilating
Temperature evaluation
for freecooling mode in
progress
Preparation for freecooling mode in prog-
ress. It evaluates the temperature and
the conditions necessary to activate this
mode.
74 – Flow reduction,
minimum temperature
in
the canal not reached
Unit operates in a
restricted mode
The unit is trying to reach
the set values of the chan-
nel'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
76 – Water pump
defrosting
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 de-
frost-waiting mode Automatic process
PLEASE NOTE!
• After a power outage, the unit will return to the state it was before the outage. The unit always remembers its operational
status and settings.
If you are unable to determine or remove a defect, and/or if access to device is required, contact an authorised service!
Electric heater overheated:
In case of overheating, the safety thermostat disconnects the electric heater After eliminating the cause of the problem
the preheat has to be reset manually with the safety thermostat located on the electric heater.
Its location is indicated with a RESET label found in every unit under the cover of the electric heater.
CAUTION!
If an overheating of the electric heating is announced three times in a row, the unit will automatically shut-off and the cause
of the failure will have to be removed before turning the unit
on again with the main switch.
