Amica FH 664 620 E Notice D'utilisation page 12

Indication to clean the aluminium filters
If the indication appears on the display, you need to clean the alu-
minium filters.
Once the filters are cleaned you can clear the indication. To do this,
touch and hold for approximately 3 seconds. The symbol will be
shown on the display and the appliance will operate normally.
Note: To clear the indication, the appliance must not operate.
If you want to continue to use the appliance while the indication is
not cleared, touch and fan speed will be displayed temporarily and
then will be displayed again. The fan will continue to operate.
Note: The
indication will be displayed after approximately 60 hours
of fan operation.
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