I found the manual for your model but it is in Russian. And it says that the oxycon may give a signal of "low oxy" if you set it on less than 3 lpm but the machine will work. May be alarm can switch on at 3 - let's check it. Can you go up to, say, 3.5 or 4 (you do not need to light the torch, just open the oxy valve, set to 3.5-4 lpm and let the oxycon work for some time? And what happens if you remove the hose from the oxycon and let it work alone without any attachments (like glasses for water and so on)?
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