Unexplained shut down of ResMed S9

[fastartcee]

My wife was recently diagnosed with sleep apnea, and we have acquired a ResMed S9, properly set up by a clinician. On her first night everything seemed fine until she awoke about 3 AM. The unit had shut down for some reason, and the sudden change in the air supply woke her. All connections, both air tube and electrical, were okay, and there had not been a power interuption. The air tube had not been twisted or crimped. And there was plenty of water left in the humidifier tank. In the set up of the unit, the "auto on/off" feature of the unit was disabled.

She went back to the sleep clinic to inquire about the problem. The tech had never heard of any similar experiences, but just to be sure he replaced her unit with a brand new one. Last night we tried again, but at about 2 AM the same thing happened: a sudden shut down.

Has anyone had a similar experience? We're stumped. Any advice would be appreciated. Thanks!

[Guest]

there had not been a power interuption.

I don't think it is easy to know that. Maybe a slight fluctuation that affected the S9 but not other equipment, or your home may not get clean power to start with. Put the machine on a UPS and see if it still happens.

[DoriC]

I'm not familiar with your machine but is it possible that there were such large leaks giving no therapy that the machine shuts itself down? Another thought, does your machine have a split night setting that might be turned on in error, if so it should be turned to Off.

[Guest]

Hey, I just got this machine, and the person that set me up told me that she has had a bunch of people that it had shut down automatically on in the middle of the night because the humidifier wasn't latched enough and it popped open a little bit and shut the machine off. She told me after you latch it, give it a little hit to make sure it is completely closed.

Try that and see if that makes any difference.

[nanwilson]

Do you happen to have a kitty in the house.... they have been known to bat at the buttons and turn the machine off .

[Alicia41964]

My wife was recently diagnosed with sleep apnea, and we have acquired a ResMed S9, properly set up by a clinician. On her first night everything seemed fine until she awoke about 3 AM. The unit had shut down for some reason, and the sudden change in the air supply woke her. All connections, both air tube and electrical, were okay, and there had not been a power interuption. The air tube had not been twisted or crimped. And there was plenty of water left in the humidifier tank. In the set up of the unit, the "auto on/off" feature of the unit was disabled.

She went back to the sleep clinic to inquire about the problem. The tech had never heard of any similar experiences, but just to be sure he replaced her unit with a brand new one. Last night we tried again, but at about 2 AM the same thing happened: a sudden shut down.

Has anyone had a similar experience? We're stumped. Any advice would be appreciated. Thanks!

I had the EXACT same thing happen, not once - but twice! Very eerie when you're sleeping. My Resp Therapist/DME swapped out my machine both times for a new one. They said they'd been getting calls about that happening to some clients. FYI - I think Res-Med needs to investigate this one better. Afterall, what's a person to do once the 2 year limited warranty is up?

[Slinky]

INTERESTING. The Resmed S9s aren't the only devices this is happening with!!! The PR SystemOnes are having a similar problem. Only sometimes they even restart themselves and stop themselves multiple times per night. And, yup, they do this when Auto Stop and Start are turned off. PR has been replacing them under warranty.

[TalonNYC]

Mine has exhibited some odd behavior too. Once in a while the metrics for that night will reset to zero, so I'll wake up and see that I got 2 hours of sleep, when I actually went to bed 6 hours before.

Strangeness, but the machine does stay on in my case.

[aucswy]

my guess is that she has a very large leak which makes the machine shut off because it cant sense any backpressure from her breathing efforts.

[dwynne]

my guess is that she has a very large leak which makes the machine shut off because it cant sense any backpressure from her breathing efforts.

My S9 beeps when the leak is large, which makes me up (or wakes up my wife who wakes me up) so I can fix it. Looks like this is an option in the clinician's menu. I would for sure turn that on, you can also turn on "smart start" which is supposed to power up the S9 when it detects the user inhale. Then if it powered itself off, it would turn itself back on?

[Otter]

Hey, I just got this machine, and the person that set me up told me that she has had a bunch of people that it had shut down automatically on in the middle of the night because the humidifier wasn't latched enough and it popped open a little bit and shut the machine off.

There should be an error message if it shuts off because the humidifier lid is open. It will say, "The H5i lid is open," or something like that. In my experience, it doesn't take very long for the machine to shut off is the lid isn't completely closed.

She told me after you latch it, give it a little hit to make sure it is completely closed.

A better way to tell if it's latched is to watch the release when you close the lid. It should move over and all the way back.

my guess is that she has a very large leak which makes the machine shut off because it cant sense any backpressure from her breathing efforts.

I once ran my s9 for four hours without anything to create back pressure. It did not shut off.

I think it comes back on by itself after a brief power outage, but I won't swear to it.

Cats and sleep fumbling with the controls are both possibilities. Do you have a video camera? If so, you can use photographic negatives as infrared filters in front of the lens and a light source.
viewtopic/t66218/viewtopic.php?f=1&t=65101&p=607889

[RUFFSTUFF]

I've had my S9 since mid-March and in the last week twice on separate nights it has just shut off while I'm sleeping. It had never done it before. If it happens again in the near future I'm going to contact my therapist/supplier and see if there is something going on... Weird, for certain. I'm going to download my data to see if I can see anything in the meantime...

[archangle]

Maybe the humidifier is only partly latched and it starts leaking badly and shuts off. Then when the pressure goes away, it seals back up and latches.

Sounds goofy, but might be possible.

[landg1]

Err, I'm not suggesting this is happening with you, but in my case, I believe that I've learned how to turn it off in my sleep. It's rather frustrating, but I think that when it's leaking, I can turn it off and roll over, sometimes without removing the mask!

[dwynne]

Err, I'm not suggesting this is happening with you, but in my case, I believe that I've learned how to turn it off in my sleep. It's rather frustrating, but I think that when it's leaking, I can turn it off and roll over, sometimes without removing the mask!

Good point, I can do that sometimes with the alarm clock and never wake up. If the S9 beeping with a leak or the air noise someone could punch it off w/o waking. I would not think someone new to the box would do that, but you never know.

One night I got all masked up, oximeter taped to finger, pillow fluffed up just right and me in the bed - the S9 would not start. I had to get out (to see the display) to see that the cover to the humidifier was just barely open. I make sure it is firmly latched now,but I think I will try turning smart start on tonight and see if that works. Not going to fix leaving the cover open, however.