Alarm code Category Display text Description/cause Fault correction
18 I SET
Part of the program setup lost.
Can be due to long-term power
outage or lightning strike.
The unit will continue to run on
standard setup
Reset alarm.
Program week program as
required.
Contact service if the unit is
running unsatisfactorily or as
before, as any sub-programs can
be lost. (sub-programs are only
accessible by service)
19
I FILTER
Filter sensor set for X days for
check/replacement of filter (30,
90, 180, 360 days). Standard
setup is 90 days
Clean/replace filter.
Reset alarm.
21 I SET TIME
Occurs in the event of power
outage
Week timer settings must be
checked and set if required.
Reset alarm.
22 I T AIR
Target heating of intake air not
possible (only applies if comfort
heater fitted). Comfort heater and
unit cannot raise the temperature
to target.
Set lower target intake
temperature.
Reset alarm.
71 W EXCH DEF
Max. defrosting time exceeded for
counterflow exchanger. Can be
because the unit has been exposed
to low temperatures
Contact service if cancellation of
alarm does not help. Note current
operating temperatures from the
SHOW DATA menu as an aid to
service
91 I OPT IO Option PCB missing Contact service
92 PRESET
Error when entering or loading
installer's settings
Contact service
10
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