No Depression means problems with air flow through combustion chamber - the translation to English from Italian sometimes leaves a bit to be desired
From PPLcangotoh's statements, he is expecting to go more than two days without cleaning and these stoves do require specific maintenance cleaning to burn efficiently. From the manual, this alarm is triggered by the following conditions: "Combustion chamber dirty, Door open, Flue blocked, Vacuum switch malfunctioning"
PPLcangotoh what is your cleaning routine for burn pot and ash? Daily/ every other day? Internal exhaust pathways and venting? 1000 hrs as stated in the manual? I have cheated it to the 1200 hrs waiting on better temps without any alarms. Rule out cleaning issues first...if you haven't already.