Hi,
Thank you all. I really appreciate the support, it is priceless.
I also do habe the manual, and I am not able to find a similar problem on the manual...
The sound is not an alarm sound, does not come from the board (none of the warning lights are on either, the oxy flow is ok too.) The sound is coming from inside the machine, I think it is related to a part within the compressor.
The same sound appears when I disconnect the hose from it and let it run without anything connected to it.
The sound is like when you have a turning wheel and in one point of the cycle the wheel is touching to another piece. Sound is not very loud ( someone who doesn't know wouldn't notice it), but it is there, and I am afraid to use the machine to not to damage it!
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