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Resmed air sense 10 - smart start

My resmed machine does not turn off when I remove mask; it’s been turning off months with no issue.

This is my second machine where I’ve had problems with auto start/stop. When this happened with my last machine; the air pressure would sometimes increase to max and I could only lower by turning the machine off . The machine would then turn itself on and run for hours unattended. My dealer tried to convince me I left machine on.

The problems always began with the same symptom- machine would not turn off . Resmed referred me to dealer. Dealer had me jump through hoops until warranty up and then had no record of my problems .. that’s just an aside . No one claims to have ever heard of problem.

Does anyone know what the issue might be ?

An airsense 10 is a fixed set pressure with a ramp start pressure. Do you use this ramp feature? If so, how long do you have the ramp set at? If not, then something is wrong with the unit. DME's suppliers will try and drop the ball, but you have to be alot more stern than you are. It seems your machine is malfunctioning. When you say it turns on by itself and runs unattended? When you start to breathe with your mask on, it senses you breathing and turns on. If this is the case and it runs it's attended then.

You are not the first one with this problem. I recall there have been one or two others with the problem, and unfortunately do not recall if there ever was a solution. You could try a search here to see what you find. One possible cause could be having the mask type set wrong for the actual mask you have. For example if you have a nasal pillow mask which uses a lower purge flow, but have the mask set on full face which uses a larger purge flow, then perhaps the machine does not see the flow as high enough when you take the mask off. The other possibility is that your set pressure is very low, and when you remove the mask the flow does not go high enough to shut the mask off. One other possible cause is the way you take your mask off. Do you remove the mask and leave it attached to the machine? If so the flow rate may not go high enough to shut it off. If you disconnect the hose from the mask first before taking the mask off, the flow will likely be higher. I have the ResMed AirSense 10 but I do not use the auto stop feature, only the auto start. I just manually turn the machine off and then remove the mask, as my wife is usually sleeping when I get up and I don't want to disturb her with the big whoosh of air when you let it auto stop. So, I don't even know if my machine would shut off if I just removed the mask first. I know for sure that if the hose disconnects in the night that will shut the machine off if I don't get it reattached in less than about 5 seconds.

You have an option to have the machine turn on when you breathe in the mask... it has to be enabled on the settings on the machine. When you wake up the machine has to be shut off manually with the power switch.

The old topics on this same problem https://myapnea.org/forum/cpap-machine-won-t-shut-off-part-deux

I am wondering if it is because of a software update.

Any of the searching I have done on this shows that it has been a long-standing problem. The sensor probably wears out.