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The keypad is designed with carbon painted pads on the end of the silicone pad. These types of buttons are the least reliable. The conductive material can wear out both with use and exposure to air over time. It would take many years but a new unit that has been sitting in the box for a long time could have button problems right out of the box.
The ButtonWorx™ repair pad is installed without having to remove any screws! Once installed your old keypad (when pressed) will push down on the new button membrane and complete the switch. ButtonWorx™ conductive dots are held just above the circuit board contacts with a very thin spacer. The membrane buttons install by sticking them to the plastic side wall of the button chamber (after temporarily removing the rubber keypad).
ButtonWorx™ material has been tested over 1 million button presses and over a decade. ButtonWorx™ should never wear out under normal circumstances and you should never need to worry about your buttons giving you trouble again.
Attached humidifiers need to be removed before you can easily take the keypad cover plate off. There are several different humidifiers and I am not sure how they all attach.
H4i pulls off while pressing the release button on the bottom

Amazing product!
The button repair for the ResMed S8 devices work so well! They were easy to install and have saved me from an expensive CPAP replacement.
Resurrection
Of the ResMed S8 Elite II
Like another review, my on/off button stopped working, so I just unplugged the unit for on/off. But then the unit got turned off and seemed to be dead. Just happened on this site looking for anything to either confirm it was dead or if there was something that could be done. I just finished the install, the video is great, and the unit is working. Back on travel duty. Thank you very much.
Believe all of the 5 star reviews!
This product is awesome! I was having trouble turning my cpap on/off. I was having to push the button multiple times, actually mashing it down trying each side of the button before it would register. Very frustrating! I thought I was going to need a new cpap machine then I found this. It was so easy to install and it works perfectly just like new. Just 1 little tap of the button works now. Fixed for around $12. What a deal!
Perfect repair
I really appreciate your attention to detail. Your repair pads worked as advertised. Have had a wonky switch for ages. My Cpap was set in the on position with my power cord functioning as a start stop button. No more. Thank you
I can sleep!
For some time I had to ram the button down for about 5 seconds to turn on the machine then the button stopped working altogether so had to unplug every morning & plug in every night. Tonight it just stopped working altogether and couldn’t do anything to start up. 1am I got up, followed the video, 15 minutes later & I now simply press lightly on each button & get instant response. THANK YOU! Took a few weeks for the kit to arrive but from America to Australia that’s to be expected & well worth the wait