My brother lives in a far province in Russia. He has been using his CPAP for 2 years and it worked fine. But recently it started behaving weirdly despite the fact that no changes has been done to any settings whatsoever.
A cycle starts OK but then the machine rises the pressure and keeps it high though breathing stays the same. He performed 'mask test' and it ran OK, so no leaks, I assume.
I wonder if there is any way to do a factory reset of the machine or any diagnostic procedure? Service is not available at that area, so a tip or advice are highly appreciated!