Resmed S9

[Nevilgator]

I have been using my S9 for about 8 yrs with no problems, so decided to buy a used one as a back up.
Appeared to work OK at first, but keeps coming up with error messages, Attention, heated tube fault, replace tube, also Error, Humidifier fault, replace humidifier.
Nothing wrong with both of these as swapped ones from my good machine, still errors,
Went into the clinic area and did a factory reset, worked OK for one night, then started to error again.
Does anyone have clues on a fix?

[jaswilliams]

The humidifier and heated hose connection on an S9 is separate from the main unit and fully interchangeable. Try using the unit from your other machine to see if the fault moves the humidifier units are not too expensive to replace if necessary