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Power alerts and a blank screen on a CPAP machine

Most power messages mean the machine is getting the wrong power supply, too little voltage, or none. The makers’ steps are about the plug, the power supply and the battery; none of them involves the therapy settings.

Therapy settings: This page explains what a CPAP machine’s screen or light is telling you, in the maker’s words. It is not medical advice: ask your equipment provider or clinician about your therapy settings, and do not change your pressure or any prescribed setting because of anything here.

Philips Respironics

Everything else Philips Respironics’s machines show: Philips Respironics CPAP icons and messages.

React Health

  1. React Health Luna G3 Words on the screen

    Power Failure!!!

    An audible alert that sounds 6 seconds after the machine loses power while it is delivering air. It does not sound if power is lost in standby, and nothing is shown on the screen during a power failure.

    The alert table gives no step. React Health notes that when power comes back the machine returns to the state it was in before the interruption.

    Source: Luna G3 APAP / Luna G3 CPAP User Manual (React Health, V1.7, issue date February 29, 2024), checked 2026-09-29.

  2. React Health Luna G3 Words on the screen

    Low Input Voltage!!

    The voltage from the power adaptor is lower than 22 V; an audible alert sounds.

    The alert table gives no step. Its troubleshooting table says to make sure the power cord, power adapter and machine are connected properly, and to contact your home care provider if no cause can be found.

    Source: Luna G3 APAP / Luna G3 CPAP User Manual (React Health, V1.7, issue date February 29, 2024), checked 2026-09-29.

Everything else React Health’s machines show: React Health CPAP icons and messages.

ResMed

  1. ResMed AirSense 10 Something the machine does

    Screen is black

    Either the screen backlight has turned itself off (it does so after a short time), or the power is not connected. If power is interrupted during therapy, the machine restarts therapy by itself when power returns.

    What ResMed says to do

    1. Press Home or the dial to turn the screen back on.
    2. If it stays black, connect the power supply and make sure the plug is fully inserted.

    Source: AirSense 10 user guide (AirSense 10 AutoSet, AutoSet for Her, Elite and CPAP, with HumidAir) (ResMed, 378947/1, 2021-02), checked 2026-09-29.

Everything else ResMed’s machines show: ResMed CPAP icons and messages.

Fisher & Paykel Healthcare

  1. Fisher & Paykel Healthcare SleepStyle Something the machine does

    Therapy won’t start and the screen is blank

    The power cord may not be connected correctly, or there may have been a storm, power cut or power surge.

    What Fisher & Paykel Healthcare says to do

    1. Push the power cord connector firmly into the power supply and into the back of the device.
    2. Check your circuit breaker or fuse and reset it if needed.
    3. If the screen still does not come on, return the device to your healthcare provider.

    Source: F&P SleepStyle Use and Care Guide (SleepStyle Auto, SleepStyle CPAP) (Fisher & Paykel Healthcare, Use and Care Guide, English section A), checked 2026-09-29.

Everything else Fisher & Paykel Healthcare’s machines show: Fisher & Paykel Healthcare CPAP icons and messages.

Other things a CPAP machine shows

Sources

Each maker’s own user guide only, read on the date shown. Nothing here comes from third-party CPAP forums or “error code” sites.

Find any icon, message or light on your machine →