I have a goodnight 420 sp and cannott adjust the settings to lower the pressure. Who knows the procedure as I have too much pressure now. Thanks
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From here:
To get into the clinician's setup mode in a 420 series CPAP machine follow these steps:- make sure the CPAP machine is plugged in
- find the secret button beneath the two "o"s in the word GoodKnight which appears just above the LCD screen
- press the secret button and the Information Access button simultaneously for 2 or 3 seconds.


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