Airsense 10 suddenly shut down

Was woken up early this morning by not being able to breathe. Looked over and my Airsense 10 was off. It was completely dark and unresponsive. I looked outside - blue skies, calm, no sign of any bad weather. I unplugged it and plugged it back in about 5 times, on the fifth time the machine suddenly came back on and resumed blowing as if nothing had happened. It transmitted my sleep data normally later on.

The machine is plugged into a surge protector which also has my alarm clock and a power alarm plugged into it to wake me up in case the power goes off. Both were on and acting normally.

Bought this machine new in late 2020.

Anybody ever have this happen? Just a hiccup in the power from the wall which upset the machine? Or could it be going bad already? Power did not go off for any length of time or my power alarm would have gone off and it is quite loud.

In other news my last email from Philips regarding the recall on my System 1 was in January, so that "backup machine" is still sitting there waiting to be fixed or replaced.

Do you have SmartStart off or on?

Have you checked the leak rate at the end of the night?

tisket wrote: ↑

Sat Jul 23, 2022 9:48 am

I unplugged it and plugged it back in about 5 times, on the fifth time the machine suddenly came back on and resumed blowing as if nothing had happened.

Was the mask on your face when you tried the repeated plugging in and it took about 5 tries or was the mask off your face?

• Unplug and leave unplugged for a couple minutes.
• Check all cable connections are firmly seated:
  • DC at back of CPAP
  • AC at Power Brick
  • AC at outlet
  • Surge protector to wall.
• Check all hose and mask fittings are seated tight
• Check OSCAR graphs for large leak immediately before power down
• Consider turning off SmartStart, but this is the component that will restart it, should there be a power fail

ResMed's have a two year warranty so you should still be covered.

SmartStart is off. Mask was off my face when I was plugging and unplugging things. (Machine was totally dark, and not responding to controls, and there was no air blowing, so not sure how it would even know whether the mask was on.) Also tried unplugging and replugging the DC plug at the back of the unit with no effect.

Other items in the surge suppressor strip are working fine so I don't think there can be any issue with the strip being plugged securely into the wall. I will check the brick connections although as I say the machine came back on just from being unplugged and replugged into the power strip enough times so if it was a loose brick I would not expect that to work.

The OSCAR stuff looks pretty weird. Incident happened around 7:10 but there are other weird readings around 5:45. Mouth was taped so if the machine stopped then it seems unlikely I would have slept through it.

Getting a message I can't upload an attachment because the board attachment quote has been reached. I will try using imgur.

How old is this machine?

The leak wasn't big enough or prolonged enough IMHO to blame the leak for the turning off of the machine.
With SmartStart turned off and there was a big enough leak the machine might not sense the human on the other end...I don't see blaming leak. It was really the only non alarming or worry potential cause that I could think of and I don't see blaming leaks.

Then the repeated multiple plugging back in needed to get it started again....that's worrisome as well.

Do you have a back up machine handy? I would be worried that at some point in the future it simply won't restart.
It could possibly be that the connecting pins need cleaning at the machine to power supply connection.
If you have a back up same machine you might try a different power supply on the off chance that the power supply itself was the problem.

Bought this machine new in late 2020. So less than two years old.

Yeah it didn't just stop blowing, it was DARK. Screen was dark, top button was dark, pressing buttons and twiddling knobs did nothing. It acted like it had no power at all until finally it resumed blowing at full strength after the fifth plugin.

I have two backup machines, the System 1 (still waiting for the foam repair) and a still-in-box Airsense 10 I bought as a spare when the Philips incident happened and I wanted to grab a machine before the prices went through the roof. This is also serving as a spare for my girlfriend who has been trying to get a new bipap machine for a year through Medicare and the usual terrible local DME.

It always makes me nervous when a machine doesn't work like it is supposed to and I can't find something to blame the problem on.
I tend to lose faith in all aspects of the machine....even though maybe it really is working fine.

There is a known problem with the machine pins at the connection to power supply losing connection ability.
Some people have had good results cleaning those pins and it seems to fix the problem. Others not so much.

The acbio.com cpap machine fixing people are now licensed to fix ResMed machines and I would imagine also do warranty repair. You might give them a call and see what they think while you still have warranty available.

tisket wrote: ↑

Sat Jul 23, 2022 11:34 am

Bought this machine new in late 2020. So less than two years old.

yup, sounds like your set while you get this machine done under warranty.

let us know how it goes!

That break at 5:45, looks exactly like a short removal of power.

• There is a break in all graphs
• The pressure trace moved immediately from 8.5 to 8, and then stayed there for a while
• The leak trace moved immediately from 26 to 0

Consider:

• Going through previous nights as looking for abrupt, short therapy breaks
• Setting your ramp to Auto and Ramp Pressure to 7.8 (or ramp 8.0 and min pressure to 8.2). This is *not* for therapy reason but to determine if your machine is having power cycles. You won't notice the the 0.2 difference in pressure, but a pressure of 7.8 will show up on your graphs and the only explanation is a power cycle. AutoRamp does a good job of detecting sleep and switching to therapy mode, and if it doesn't detect sleep, it will also switch to therapy mode should it detect events.
• Should more unexplained power cycles occur, consider swapping the power brick with your spare, to determine if the problem is the machine or brick.

Thanks everyone. Looking back I do see a short break around 4 AM last Monday night. Further in the past I see breaks but they tend to be in the first ten to thirty minutes and might have been me getting up to go to the bathroom or getting some Tums or something if I have been tossing and turning. But the 4 AM one, no way. I never get up in the middle of the night. It was for two minutes or so, surprised I did not wake up.

I have set ramp to Auto and ramp pressure to 7.8. Out of scientific curiosity I plan to try the machine some more nights while getting in touch with ResMed.

Tested the power alarm by turning off the surge suppressor strip, it instantly made a loud noise so I am pretty sure these were not power losses at the wall.

What's odd is that if the power is going off, that the machine is restarting itself when power comes back on, even though Smart Start is off. Is that normal? If you have a machine on and blowing, and pull the plug, then plug it back in minutes later, does it pick up right where it left off? That seems kind of weird. I would expect it to just stay off.

There is a known problem with the machine pins at the connection to power supply losing connection ability

Interesting. This is where the cord from the machine enters the brick? I wonder how they clean them. Probably best not to mess with it if it's under warranty.

tisket wrote: ↑

Sat Jul 23, 2022 6:33 pm

This is where the cord from the machine enters the brick?

No. The pins are in the machine itself so it's right where the power cord plugs into the machine.
It's where the cord coming from the brick plugs into the back of the cpap machine.

tisket wrote: ↑

Sat Jul 23, 2022 6:33 pm

What's odd is that if the power is going off, that the machine is restarting itself when power comes back on, even though Smart Start is off. Is that normal? If you have a machine on and blowing, and pull the plug, then plug it back in minutes later, does it pick up right where it left off? That seems kind of weird. I would expect it to just stay off.

Very odd indeed. If SmartStart is off and the machine loses power or gets unplug it shouldn't start up again until the power button is pushed and when it does it should start at the minimum settings.

I thought this action was strange too; but sleepgeek said that "most cpap machines will come back on" when power is restored without pressing the "on" button.

I tested it and it seems to be that way for the S9. But the S9 still goes through the warm-up procedure of checking for the sd card etc. and then starting blowing right from 0 it seems. it's not instant-on; it takes more than a few seconds. is it possible that medical devices all have to have this feature?

it's DC power at the connection to the machine but if you can find some sort of DC tester, then the next time it happens, you could test to see if you have power (at least some power) at the machine end of the power cord.

more important perhaps is that the power should be 24 volts or within the requirements of the machine, I think. I have read somewhere that the machine will shut down if the voltage is too high or too low but others may have better information on this.

If the machine has lost power either by loss of electricity at the wall unit or at the connector to the machine then when the power is restored by whatever means then the machine will go back into standby mode but it won't or shouldn't blow air and shouldn't "Pick up where it left off" without pushing the "ON" button.

I got the impression that the OP was saying the machine started blowing air and wasn't talking about standby mode.

Perhaps I got the wrong impression.

SmartStart is only for starting the therapy air pressure blowing once it senses a human on the other end or turning the blower off when it doesn't sense the human still being attached. With SmartStart being on the machine won't start blowing air unless the ON button is pushed.

Standby is where the machine has power but isn't blowing therapy air. Air doesn't blow until either SmartStart starts the air blowing or the human pushes the on/off button.
Standby is a normal part of the procedure after someone has lost power. The machine has to reboot all the internal software and it takes a short time once power is restored.

If you have a multimeter, where do you touch the probes to determine voltage on the S9 and AS10, where the adapter electrical cord plugs into the machine? The S9 has 3 pins and a metal cylinder; the AS10 has a center pin and two metal cylinders separated by yellow plastic.

One circuit is supposed to measure 3.75v? I think.