I have a ResMed S9 H5i Elite and have noticed that the "Faulty tube - replace tube warning" screen comes on when there is nothing, necessarily, wrong with the tube.
If I plug the tube in, for instance, to change settings and then remove it without having used the machine, this 'replace tube' warning screen comes on. The first time it happened, when I had only had the machine a few months and didn't know any better, off I rushed to the supplier for a new tube. The clinician said there were pinholes around the end of the tube but I couldn't see any; however, I did replace the tube ($100). Since then I have seen that warning screen any number of times and now know to ignore it.
Anyone who has only recently acquired such a machine and is new to this apnea world, I hope will take a very close look at any tube the machine wants replaced. This warning need not always be taken seriously and who wants to be throwing $100 bills around unnecessarily? . . . I don't suppose many of us do! ☺
is it possible that there is a problem with your machine and it should be repaired or replaced? just throwing that out there to think about. YMMV
Are we talking hose? Not sure because even the overpriced hose is $50, maybe a heated hose? Maybe it is not seeing the heater contacts on the hose, that would make more sense to me as to something it could detect. If it is air leak how does it know the difference between the hose, the hose on the mask and or mask leakage? Pinholes sounds made up to me. The mask vents are more than pinholes.
Doc J (despite my nickname I am not a doctor)
Remember to donate to the board if you can, it has helped a lot of people including myself.