I have been using the new ResMed S9 machine since october 2010. I have had a few issues with the Humidifier. The first problem I had was with the heated ClimateLine tube. Sometimes during the night the unit would just shut down and lock up with an error that said: "Hose failure. Replace hose." When this error message came up the S9 flow generator unit would completely lock up. None of the buttons would function. (Not even the power button.) The only way to get the machine to respond was to unplug the power supply and reset the unit. I attribute this issue to a loose electrical contact in the hose. But in any case it should not make the computer in the S9 flow generator lock up and stop responding to user input. This is a firmware BUG.
The second problem I am having with the Humidifier is that when sunlight hits the humidifier during the daytime (When the unit is shut off.) I get a message that says: "Humidifier failure! Please replace the humidifier unit." Simply pressing the control knob clears this error message. The unit does not lock up. And the humidifier unit works perfectly fine at night. I believe that the sunlight is raising the temperature of the humidifier slightly making the computer think that the heater is still on. But why is is monitoring the humidifier tank while the unit is shut off? This seems like another possible firmware BUG.
Has anyone else seen these same kinds of errors from the S9?