Resmed 11 humidity pot runs out of water

Here are some picture of the ResMed 11 tank:
(1) overflowing when attempting to fill it to its advertised 380 ml capacity
(2) when filled to a more realistic 325 ml capacity

This tank tapers downward at the hinge side. It is visibly lower from its side view. There are also 3 slots in the tank rim at the hinge side.
Both of these "features" make it impossible to fill the tank to the MAX line.

Overflow when filling with 380 ml





Filled to 325 ml

Please don't use the name resident 11 anymore because there are so many misconceptions between doctors and the people who work in the dme's and the people who work at the doctor's offices who send the information to the dmes and nobody knows what the hell's going on. If it's an ass 10 to 11 say that's what it is or use AS11. And when the aircraft 11 is actually released please call that the AC 11. Can you imagine my doctor's office didn't know but I was using and wanted to CPAP and one's a bypass. They ordered the CPAP because I said I only want the air curve 11 and if it's not there I'll wait.

The only people that know everything that's going on are the people on this website. And for those of you who are new here catch your lucky stars you found this place because it will really help you in the long run because she really do have to get the machine working right with the right masks and you have to be sleeping possibly in the right position cuz you want to get those ahas apnea events as low as possible.

Alan, I had to read your post a few times to understand what you’re trying say.
It seems you are saying be precise about what ResMed 11 model we are discussing with your example being Airsense vs Aircurve.
Ironically you have “resident” and “ass” and “aircraft” and “bypass” in your explanation.

It appears, however, that ResMed 11 is appropriate umbrella term for this tank discussion since all these ResMed 11 models use the same tank according to a CPAP supplier.

* ResMed AirSense 11 AutoSet
* ResMed AirSense 11 CPAP
* ResMed AirSense 11 Elite
* ResMed AirCurve 11 VAuto
* ResMed AirCurve 11 ASV

pjdaly wrote: ↑

Tue Apr 02, 2024 5:05 pm

I live near the ocean and it's a very wet environment here.

Do you need as much humidity as you are using? Did you ever try lower (manual) settings to see if your nasal passages get dry?

pjdaly wrote: ↑

Tue Apr 02, 2024 5:05 pm

changing my max pressure from 20 to 17 which ... had the effect of increasing CA events.

That's counterintuitive. I will guess the CAs were while you were awake. This is normal.

Was your pressure going above 17 before the changes were made? Do you have a history of central or mixed apnea?

Yes, my mouth gets dry on automatic. I would like to turn the humidity up a little, not down.

The only change that started the running out of water was changing from a DreamStation One to a ResMed 11 Autoset. The mask was the same.

One very noticeable difference between the ResMed and the Phillips is the ResMes makes a lot of noise when running at or near maximum pressure 20 and that would make me wake up 2 to 4 times a night. Both machines were set to start at 10 with a max of 20.

The Fisher-Paykel Simplus mask can handle this pressure without leaking at but over 19 just bumping the mask will make it burp. This is rare though, because I sleep lying flat out on my back like a corpse and don’t move and the only thing touching the mask would be a blanket pulled up high If I’m cold.

I would turn the ResMed off and on to make it start over again at 10… then some time later it would ramp back up at 19 plus. Sometimes my wife would wake up first. At times I would wake up from the turbine noise and realize I’m not breathing without any feeling of suffocating or need to breathe which was very surreal.

The Phillips pressure was set at 10 start 20 max the 5 years I had it and I slept through the night with it.

I have mostly CA events with one or two 2 OA events. The doctor remarked that high pressure can exacerbate CA but after max was lowered from 20 to 17 and the adaptive mode selected, the CA count went up. [EDIT: I just looked at OSCAR and APAP mode has always been selected from first use, not when pressure was changed].
I’m not a doctor but my gut feel is the reason I stop breathing is connected to my Parkinson’s which I’ve had for 16 years. I think the ResMed must be trying to make me breathe by ramping up pressure to the set maximum. The water tank now last about 7.25 hours rather than 6

I didn’t pay attention to what the Phillips was doing except looking at the AHI because I slept through the night with it and it didn’t run out of water. I didn’t use OSCAR to look at details until I got the ResMed because it was only then that I started having noise and out of water problems.

I am going to measure the capacity of sister’s ResMed 10 to see if it’s more than the ResMed 11’s 325 ml capacity and maybe ask my doctor to get one for me to try.

Alternatively I might resurrect my (recalled) Phillips but I have to fix the latch on the water tank which broke and causes the cover to sometimes pop open during the night. I already took the foam out of it but it may be noisy without it.

pjdaly wrote: ↑

Thu Apr 04, 2024 10:58 am

Yes, my mouth gets dry on automatic. I would like to turn the humidity up a little, not down.

The only change that started the running out of water was changing from a DreamStation One to a ResMed 11 Autoset. The mask was the same.

One very noticeable difference between the ResMed and the Phillips is the ResMes makes a lot of noise when running at or near maximum pressure 20 and that would make me wake up 2 to 4 times a night. Both machines were set to start at 10 with a max of 20.
(snip)

You should note several things. At this high a pressure you should be running a bi-level machine. You should just bump your min pressure up to 16 and set EPR 3, the machine is waiting for you to have problems before helping you. You may have had Flex turned on for your Respironics, same as EPR. Higher pressures strip your O2 away in favor of CO2... so you need pressure support (PS) or expiratory relief (EPR) to help flush it out. The range you're seeing takes you from where EPR3 would cause CA's (10cm) to where you need EPR (20cm). If the machine sees CA's it will not respond with pressure... it raises pressure due to OA's, H's, FL's, and Snore. Flat on your back you're having mega FL's I bet.

Flat on your back is the worst position for OSA. I've decided to go to higher pressures using a bi-level machine to help my shoulders, the arms go to sleep with side-sleeping. If you don't like the pressures going that high I suggest you get off your back. If you can't get off your back I suggest an Aircurve 10... not the 11. with 17 over 21 PS4 I can sleep supine if I want. I do some mandibular advancement before bed, the jaw stays somewhat forward all night.

You should be aware that a recently found problem with the Airsense 11 Autoset (you have one right?) is that the hose can very easily be unlocked where it is leaking air... this is probably what you're hearing. This will bleed the water away quickly. It can also fry the heating system. Everyone with an 11 should read my thread on the problems Uncle Nick Dunn has uncovered.

pjdaly wrote: ↑

Thu Apr 04, 2024 10:58 am

Yes, my mouth gets dry on automatic. I would like to turn the humidity up a little, not down.

CPAP humidifiers are designed to keep the nasal passages and throat from drying. They usually do a poor job of preventing mouth dryness in people who mouth-breathe.

In some people, turning the humidity up can cause a bit of nasal congestion which results in more mouth-breathing.

vandownbytheriver,

I just noticed the doctor lowered my pressure a second time on 20 Dec 2023 from [10 start, 17 max] to [7 start, 15 max].
The Philips was always at [10, 20] for the 5 years I had it. Don't know what the Flex setting was.

The Airsense 11 Autoset pressure history is:
[10, 20) on 3 March 2023 (when I got it, same as the Philips)
[10, 17] on 14 Aug 2023 (made the tank last about 7.25 vs 6 hours)
[7, 15] on 20 Dec 2023 (tank still last about 7.25 hours)

Re running a bi-level machine and bumping min pressure to 16:
I have been letting the doctor choose machines and pressures. This would be me taking over my apnea treatment from my doctor and that would be awkward and more importantly I'm not qualified to do that. And I suppose that would mean I'd have to buy the machines and supplies on my dime rather than medical insurance as I do now (with no copay).

Re: "it raises pressure due to OA's, H's, FL's, and Snore. Flat on your back you're having mega FL's I bet"
I have very few OA's... sometimes none and the CA's are multiples of the OA's.
My April 2 Events were: 12 CA, 22 H, 2 OA, 12 RERA
Snore graph was empty that day. I looked at some other days and the Snore graph has something like 2 to 4 ticks.
I assume "FL" is "Flow Limit??" Don't know how to interpret FL... for April 2 it seems most of time under .33 and 10 or so spikes under .67.

Re sleeping on back:
I have to sleep on my back for another medical reason and I'm lucky in that regard that I naturally can and do.
Some people can't and some people toss and turn but I don't move.
In fact I started on sleep therapy after my wife noticed me not breathing while asleep.

Re the hose leak found by Uncle Nick:
I saw your post earlier (before your response here) and watched Nick's video. I don't have that issue as I run the hose straight back out of the machine and over the back of the nightstand. I noticed right away that there was no swivel when I got the machine a year ago and thought that was a bad design. So I made sure the hose is never pulled side to side.

pjdaly wrote: ↑

Fri Apr 05, 2024 9:31 pm

vandownbytheriver,
(snip)
Re running a bi-level machine and bumping min pressure to 16:
I have been letting the doctor choose machines and pressures. This would be me taking over my apnea treatment from my doctor and that would be awkward and more importantly I'm not qualified to do that. And I suppose that would mean I'd have to buy the machines and supplies on my dime rather than medical insurance as I do now (with no copay).

Most of us here have 'taken over', as you say. I believe I know more about my condition and best treatment than my doctor... given that (original AHI 104) he suggested a new sleep study (try to sleep without CPAP!) and didn't even suggest Ambien (it would have taken full anesthesia). The result was a 'failed' sleep study, 500$ wasted and a 'new' diagnosis AHI of 24! 14 years and +100lbs later, I'm almost cured! You're here... *we're here*... because our doctors have not been able to fix us up properly... my point is that this condition has to be run from the inside, you're the only one that knows how you're responding... going back and forth to the doctor is expensive for one thing, depending on how that's run.

You *always* have the right to change your pressures etc... you have the prescription for the machine. If you get stuff free that's great! I have to meet a 5000$ deductible/out of pocket before insurance will pay... and the prices to get there are outrageously high... so I just go straight to cpap dot com. Amusingly, when I asked them how long my prescription would last, they told me *forever*... bought a brand-new AS10 C2C for 399$... doctor was irate that a) I hadn't seen him in five years and b) I got a new machine without his consultation. *I* was the one that suggested I get a bi-level titration... my treated AHI was always less than 2... but I didn't like my O2 graphs and breath waveforms, something my doctor did not even try to read... 'that's for the sleep techs!'. Become your own sleep tech... that's what I had to do. At the recent titration I really hit it off with the tech... he could tell I knew WTF. Ended up making a believer out of him regarding mouth-taping... he was skeptical. Hopefully he's watching Jason and Nick videos now... he is a sufferer, that's important... your doctor should be a user too if you can find one... mine is, or claims to be. Anyone know a sleep doctor in the Austin area that knows WTF?

Re: "it raises pressure due to OA's, H's, FL's, and Snore. Flat on your back you're having mega FL's I bet"
I have very few OA's... sometimes none and the CA's are multiples of the OA's.
My April 2 Events were: 12 CA, 22 H, 2 OA, 12 RERA
Snore graph was empty that day. I looked at some other days and the Snore graph has something like 2 to 4 ticks.
I assume "FL" is "Flow Limit??" Don't know how to interpret FL... for April 2 it seems most of time under .33 and 10 or so spikes under .67.

Yes, FL = Flow Limitations. Doesn't sound like your sleep is very restful, sadly. An FL shows the machine thought your breaths were 'flat-topping' or otherwise distorted in a way that demanded more pressure. CA's do not respond well to pressure. Some events fall between CA and OA/H... this is where the sleep tech earns their money... the machine's event count is almost always less than reality.

Re sleeping on back:
I have to sleep on my back for another medical reason and I'm lucky in that regard that I naturally can and do.
Some people can't and some people toss and turn but I don't move.
In fact I started on sleep therapy after my wife noticed me not breathing while asleep.

We don't know if that was obstructive in nature or central (CNS) in nature. Since you require supine sleeping I recommend titration for bi-level. I recently went bi and am enjoying the benefits of it.

Re the hose leak found by Uncle Nick:
I saw your post earlier (before your response here) and watched Nick's video. I don't have that issue as I run the hose straight back out of the machine and over the back of the nightstand. I noticed right away that there was no swivel when I got the machine a year ago and thought that was a bad design. So I made sure the hose is never pulled side to side.

OK... you saw the problem... make sure the little stob is clicked in. I predict lots of AS11's with duct tape on them.

i have same problem. it's frustrating. 8 hours can empty it the tank. i replaced my first reservoir with a second and it is slightly better