I am a long term user of CPAP and have never seen this is failure previously

⟐ Answer accepted agosto 11, 2026 at 0:22 GMT-7

⟐ Answered agosto 09, 2026 at 3:28 GMT-7

⟐ Commented julho 23, 2026 at 9:41 GMT-7

⟐ Answer edited julho 21, 2026 at 10:34 GMT-7

⟐ Answered julho 21, 2026 at 2:40 GMT-7

Do you sell these models?
I have one now and want to get a spare and a second unit.
If so, what do you charge ?

⟐ Answered julho 02, 2026 at 9:23 GMT-7

⟐ Answered maio 26, 2026 at 18:34 GMT-7

I´ve trying to perform several O2 calibrations with a new sensor Max-16HT, however upon correct completion and saving the calibration the O2 sensor alarm message is still displayed on the left corner of the status bar, showing “O2 Sensor.” After that I tried performing a series of VVT’s but the only failure in this test is O2 100% (Failed), everything else is showing the result OK.

Any clues or ideas on what may be happening will be greatly appreciated.

Thanks.

David

⟐ Answer edited abril 25, 2026 at 3:50 GMT-7

⟐ Answered abril 23, 2026 at 0:06 GMT-7

Eventually, the blower stays on and it runs through my sleep cycle like nothing ever happened. This normal state might be reached after 20 restarts. Also, after some random restart count it will stay off, requiring a replug power-up to begin the restart cycle anew, up to three replugs and about 20min being a worst case. Best case it fires up after about 10 restarts. I just realized I've never checked the display before a replug so I'll do that tonight. I checked, it goes blank when it's all beeped out.

All functions, settings, and input buttons work as expected after running, including the humidifier. No leaks or bad gaskets, blower spins freely. About to replace PCA button battery but the old one had good voltage. Contact cleaner used when resetting every jack. Power supply good. Filters clean. I'll be rechecking all of these things one more time plus a picky board inspection, but I don't expect to find a problem at component level.

I can't imagine what kind of consistent, repeatable error could exist with no fault found. It behaves as if some sensor feedback is telling the algorithm that it can't run or start. Considering getting a serial adapter module and downloading the tech software but I have never seen an error code on the display.

Subjectively, 3 things I find interesting are:

1) the restart blower puff seems to gain volume and power up to the running state; if it dwindles or remains lame it's likely restart attempts will stop until a replug

2) dial digit 4 is slightly dim, but lights as expected

3) I checked the button battery voltage in situ, and it crept upwards. I've never seen this before but some reading tells me their may be an intentional capacitor storage, maybe to kick start the blower or something.

I could talk about this all night, given that a new machine will run me $1400CDN.

⟐ Commented fevereiro 22, 2026 at 23:03 GMT-7

⟐ Commented fevereiro 09, 2026 at 11:22 GMT-7

⟐ Commented janeiro 17, 2026 at 23:36 GMT-7

After replacing the motor on s9 machine?