RE: Service Required Message
I've not been able to find that code. What model Philips Respironics do you have?
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RE: Service Required Message
I have a PDF service manual for the DreamStation (original white version) which I believe is the machine you have from the image you posted. There are no service codes listed in the service manual similar to the one you have and I sort of think the only means to decode that number might be using the service software which is not available to the public.
In the service manual I did find a section on error messages and the screenshot below is as close as I could find to what you have in the display.
If using the humidifier, is there a chance it tipped in such a way to spill water into the machine?