Chrisf,
First I think you have the wrong machine listed in your profile. The one you list looks looks like this:
It is an older obsolete machine that does NOT use an SD card to record the data. It uses some kind of proprietary card instead.
I believe that you probably have a
Phillips Resprionics System One Auto with A-Flex or a
PR System One Pro with C-Flex Plus. These machines look like this:
If your machine looks like this, can you look for the word Auto or A-Flex on it to determine whether you really do have a Auto? It makes a difference. Lots of newbies seem to be confused when trying to find their Resprionics machine on the list of equipment for profiles. The problem is that Resprionics has used "REMStar" on all their machines for something like over a decade or more and the System One name is not on the machine, but rather is on the humidifier.
So please update your profile to show the correct machine.
Next, on the System One machines, that (optional) white filter is supposed to be changed once a month. And if you use the machine in a dusty environment it may need to be changed more often. The gray filter should be washed once a week. And dirty filters do affect the machine's performance. I find that I need to change my white filter once every week or two, and I prefer changing it weekly during pollen season when our windows are open much of the time.
I'll post more later.
