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17 Watchdog warning Fault in the ventilation unit software Contact service.
18 Content of database
changed
Parts of the program setting have been
lost.
This may be due to a prolonged power cut
or a lightning strike.
The unit will continue to operate with
standard settings.
Reset alarm.
Contact service if the unit does not operate
to your satisfaction/ as before, as some
subprogrames may have been lost. (Sub-
program is only available for service).
19 Change filter The filter monitor has been set at X amount
of days for check-up/change of filter.
Clean/change filter.
Reset alarm.
20 Errors in legionella
treatment
Legionella treatment has not been per-
formed within the time limit or number of
trials.
In case of repeated alarms contact service.
21 Check date and time Is displayed during power cuts. Set the date and time.
Reset alarm.
22 Error supply air
temperature
The desired heating of the supply air is not
possible.
(applies only with after heating element)
Set a lower supply air temperature.
Reset alarm.
23 Domestic hot water
temperature error
Domestic hot water heating not possible. Contact service.
27-
58
Error on the tem-
perature sensor
One of the temperature sensors has either
short circuited, been disconnected or is
defective.
Register which sensor, Tx, is faulty and con-
tact service.
70 Anode Error The hot water tank anode is either torn or
not connected properly.
Contact service.
71 Error de-icing heat
exchanger
Max. de-icing time exceeded for counter-
flow heat exchanger.
This may be due to the unit being exposed
to very low temperatures.
If resetting the alarm does not help, con-
tact service. Register the current operating
temperatures from the “SHOW DATA” menu
in order to ease the service process.
72 Abnormal low evap-
orator temperature
Abnormal evaporator temperature (T6) is
due to insufficient air flow.
Change filters, check outdoor air intake is
not stopped.
In case of constant fault contact service.
73 High pressure alarm The airflow over the surfaces is to low Make sure that air is blown into the house.
Make sure the filters are clean.
Check that the outdoor air intakes is not
blocked.
Reset alarm.
Contact service if the above does not solve
the problem.
74 Low pressure alarm The airflow over the surfaces in cooling
mode is to low.
Make sure that air is blown into the house.
Make sure the filters are clean.
Check that the outdoor air intakes is not
blocked.
Reset alarm.
Contact service if the above does not solve
the problem.
91 Missing expansion
PCB
Expansion PCB is missing. Contact service.
92 Backup error Error writing or reading installer settings Contact service.
96 Error in damper test Damper (open / closed) not fulfilled. Reset alarm.
If it does not help contact service.
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