ResMed AirSense Error Codes — What They Mean and How to Reset

Hello. If your ResMed AirSense 10 or AirSense 11 is displaying an error message or will not turn on, this guide walks through the most common problems and their fixes. Error: Red X or Exclamation Mark on Screen. This is the most general alert. It indicates the machine has detected an issue and therapy has stopped. Step 1: Unplug the machine and wait 30 seconds. Plug back in. Many one-time errors clear with a simple power cycle. ResMed AirSense machines do not have a dedicated reset button — unplugging is the reset. Step 2: Check the air filter. A clogged or missing filter triggers a safety alert on some AirSense 11 models. The gray foam filter is located on the back of the machine. Remove it and hold it up to a light — if you cannot see light through it, replace it. Filters are available from your DME provider and should be replaced monthly. Error: High Leak or Therapy Not Effective Alert in myAir App. This is not a machine malfunction — it means your seal was poor last night. Step 3: Review your myAir leak rate. A score above 24 L/min is elevated. Follow the mask leak troubleshooting guide for AirSense machines. Error: Device Will Not Turn On. Step 4: Test the power supply. ResMed uses a DC power brick. The green indicator light on the brick should be lit. If it is not, try a different outlet. If the light on the brick is on but the machine does not respond, the machine may need service. Step 5: Check for water damage. If water entered the machine — from a tipped humidifier chamber — the machine may have shut down as a safety measure. Tilt the machine gently and listen for water. Do not use the machine if water is present — contact your DME provider. Error: Pressure Out of Range or Device Not Working Optimally. Step 6: Contact your prescriber. If the machine is working but you are not sleeping well, your pressure settings may need adjustment. Your DME provider or sleep physician can access your machine's clinical menu to adjust the pressure range. Service Required Message. Step 7: The machine needs professional service. ResMed AirSense machines have a typical lifespan of 5 to 7 years. If your machine is older and showing service errors, your DME provider can help you get a replacement — Medicare covers CPAP replacement under certain conditions. Still need help? Find a CPAP provider near you →