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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.