S9 turning off in the middle of the night....

[Davidwnc]

A friend (well, for full disclosure: my ex) has a new S9 Autoset. Knowing I have one, he called after the first couple of nights and told me that it shut off a couple times in the middle of the night. Once he started breathing again it turned on again. I loaned him my loaner (the same model and almost the exact same settings) and he said it was happening with that one too. This has only ever happened to me once or twice (so I thought it was an anomaly) - is this normal (and if so, why?) and what can be done to stop it (I mean other than turning off the auto shutoff option)? Does this happen to anybody else?

[englandsf]

With two machines doing the same thing I'd suspect the outlet or wiring. Maybe test with an extension from another outlet?

[Pugsy]

What pressure is being use and which mask?
Check to make sure no big leak is happening when it has shut off?

[fdw]

A friend (well, for full disclosure: my ex) has a new S9 Autoset. Knowing I have one, he called after the first couple of nights and told me that it shut off a couple times in the middle of the night. Once he started breathing again it turned on again. I loaned him my loaner (the same model and almost the exact same settings) and he said it was happening with that one too. This has only ever happened to me once or twice (so I thought it was an anomaly) - is this normal (and if so, why?) and what can be done to stop it (I mean other than turning off the auto shutoff option)? Does this happen to anybody else?

I had the same thing happen to me. I didn't realize what was happening until I started investigating.

My CPAP machine is connected to a Uninterrupted Power Supply (UPS) and if the electrical power is interrupted or goes off the UPS will keep the CPAP running but will BEEP which alerts me of a electrical power failure or interruption.
My problem was the battery in my UPS was dead and on one particular night the electrical power was going on and off about every 30 minutes for several hours (due to high winds), but would only be off for 10 - 15 seconds. So I was never alerted by the UPS BEEP of a problem and the CPAP machine would shut down and reboot every 30 minutes of so. The UPS was replaced and I test it when ever I think about it, by unplugging the power for a few seconds to make sure the BEEP is working.

Murphy's Law is still in effect today......Your problem is NOT the S9's (both), it's the power supply, grounding problem, current problem, power brick problem, or operator error. If it works fine in your house...go back to the beginning of this sentence and start over.

Please let us know what solves your problem

[Nick Danger]

I suspect those who pointed out a possible electrical issue are probably right. However, does he have Smartstart turned on? If so, has he tried turning that off?

[Pugsy]

I suspect those who pointed out a possible electrical issue are probably right. However, does he have Smartstart turned on? If so, has he tried turning that off?

I agree but wanted to rule out the machine's issue with low pressures and some masks which can cause the machine to turn off on its own when SmartStart is enabled and certain other conditions are going on.

[Nite Ranger]

I had the same problem with my s9 shutting off at times until i disabled the smart start as previously mentioned, Its been 3-4 weeks now without incident { it was happening several times a week }

[Davidwnc]

Well, it's not an electricity problem - he switched sides of the bed with his partner, and they moved machines, but not the cords, and it still happened (no problems with his partner's machine on either side...)

He uses some sort of nasal mask (I'll have to find out which) and I'll have him look at the data for any big leaks.
Thanks for the help.

[Pugsy]

He uses some sort of nasal mask (I'll have to find out which) and I'll have him look at the data for any big leaks.

Also...find out what pressures he is using....if low pressures and a nasal mask (especially a nasal pillow mask) Smart Sense doesn't work right and can have trouble starting and staying running because it is difficult for the machine to sense breathing at the lower pressures (like 7 cm and below).

[Davidwnc]

Sorry for the delay in getting back....
His pressure settings are: min 14 max 18

[archangle]

Definitely turn off SmartStart.

My own S9 recently started shutting down in the middle of the night due to mouth leaks. Turning off SmartStart fixed it.

It would wake me up feeling strangled, but would start blowing again before I woke up enough to figure out what happened. Check SleepyHead and see if you can see leaks before the outages.

ResMed needs to wake up and separate the auto start and stop function like Respironics does.

[Krelvin]

ResMed needs to wake up and separate the auto start and stop function like Respironics does.

Or turn on Leak Alert so you know you are leaking... A great way to really screw up your sleep.

[chunkyfrog]

Some users of the smallest nasal pillows may not be able to use this feature.

[archangle]

ResMed needs to wake up and separate the auto start and stop function like Respironics does.

Or turn on Leak Alert so you know you are leaking... A great way to really screw up your sleep.

I don't think the "regular" ResMed S9 or A10 units have a leak alert or any kind of beeper at all. There are some "-A" units like the S9 CS-A model that have an extra section with a loud alarm in it.

[Davidwnc]

Knowing him, I think that turning off the auto on/off will work better than the leak alarm (if he even had it.) I guess it is the simplest fix.