The ResMed AirSense 10 and 11 have a SmartStart/SmartStop feature that automatically starts therapy when you breathe into the mask and stops it when you remove the mask. This feature is the number one cause of unexpected shutoffs - if the mask shifts during sleep and the device loses the breathing signal for a few seconds, SmartStop triggers and powers down therapy.
These shutoffs are almost always a communication breakdown between the machine and your mask. If the device can't feel your breath because of a seal leak or a software setting, it assumes you're done for the night. Worst part? It usually leaves no error code. Just a silent machine and you waking up exhausted wondering what happened. Left unchecked, you're going stretches of the night with zero therapy, which defeats the whole point.
ResmedCpapSeverity: moderate85% DIY Success
Time to Fix
2–15 min
Difficulty
beginner
Parts Cost
$20 – $85
Tools Needed
Soft dry cloth, myAir app (iOS or Android) for reviewing sleep session data
What Does the KEEPS-OFF Code Mean?
Before you assume the motor's shot, look at the power path first. ResMed units are surprisingly sensitive to voltage drops, and a loose wall plug or a worn DC barrel connector can cause the unit to reset mid-therapy. I always start with the physical connections before I even open the clinical menus. Good news is that most of the time this gets fixed in under 20 minutes without any special tools.
Most Likely Causes
Based on aggregated repair data, here is the probability breakdown for this error code:
SmartStop feature triggering on mask movement40%
High mask leak causing loss of breathing signal24%
Power supply with intermittent connection14%
Device overheating from blocked air intake12%
EPR set too high making exhalation undetectable10%
Symptoms You May Notice
You wake up with your mask still on your face but the machine is completely silent and the display is dark, no error message, it just shut off sometime in the night.
The myAir app shows 4 or 5 separate therapy sessions in one night instead of a single continuous one, which means the machine restarted multiple times while you were asleep.
Your AHI score has gotten worse lately because you're going unprotected for chunks of the night and the apnea events aren't being treated.
Machine starts fine when you put the mask on but goes dark somewhere between 1am and 3am on a pretty consistent schedule.
Your partner says your snoring came back or they heard you gasping, even though you're supposedly using the machine all night.
Can you reset a Resmed cpap to clear the KEEPS-OFF code?
For a simple glitch, unplug the power cord from the back of the unit and the wall for 60 seconds. This drains the capacitors and clears the logic board. If you perform a factory reset via the Settings menu, keep your prescription settings handy. A full reset wipes your pressure range and humidity levels back to the factory defaults.
Tools Required for Diagnosis
Soft dry clothmyAir app (iOS or Android) for reviewing sleep session dataReplacement ResMed standard air intake filter (disposable foam type)Phone camera for photographing current settings before any reset
Diagnostic Checklist
Follow these steps in order. We start with the easiest external fixes before opening up the machine.
Replacement Parts
If your diagnostic testing proves the component has failed, you will need a replacement. We recommend OEM parts over aftermarket for water-handling components.
Part Name
OEM Number
Estimated Price
ResMed AirSense 10 Power Supply UnitN/A · $45–$85
N/A
$45 – $85
ResMed mask cushion (model-specific)N/A · $20–$55
N/A
$20 – $55
Frequently Asked Questions
What is SmartStop and should I keep it on?
SmartStop kills the airflow automatically when it thinks you've removed your mask. The idea is decent enough, you don't have to reach for the button at 3am. But it's way too sensitive. A beard, a silk pillowcase, sleeping on your side with the mask slightly compressed against the pillow, any of these can fool it into shutting off while you're still asleep. I tell basically everyone to disable it. The risk of it cutting your therapy short is way worse than the minor inconvenience of pressing the stop button when you actually wake up. Settings, Mask and Comfort, SmartStop, Off. Done.
Can a CPAP overheat and shut itself off?
Absolutely. These motors are high-speed turbines and they generate a serious amount of heat. If your intake filter is clogged or the machine is sitting on carpet or pushed flush against the wall, it can't cool itself down. There's a thermal protection cutout inside that trips to prevent motor damage. If you notice a faint hot plastic smell or the machine feels warm to the touch after it shuts off, that's exactly what's happening. Clean the filter, move the unit to a hard surface with clearance on all sides, and you'll probably never see it again.
My CPAP shuts off at the same time every night. Why?
When it's predictably consistent like that, I look at external factors first. Check if a lamp or heater on a timer shares that circuit, a power surge at that moment could be resetting the unit. Also check your Ramp settings. If your ramp period is long and starting pressure is very low, the machine sometimes struggles to detect your breathing in that initial phase. And if it's happening right when you'd normally roll over in your first deep sleep cycle, it's almost certainly SmartStop triggering on a mask shift. Disable SmartStop first and see if that pattern breaks.
Will doing a factory reset mess up my prescription settings?
Yes, a full factory reset wipes your pressure range, EPR settings, humidity levels, and ramp settings back to factory defaults. Before you do it, write down all your current settings or take a photo of each settings screen. Your pressure prescription should be in your paperwork from your sleep clinic. A simple power cycle, where you unplug the unit for 60 seconds, does NOT wipe settings and is always the safe first step for clearing a glitch. Only do a full factory reset if a tech or your sleep doc tells you to specifically.
Can I use an extension cord with my CPAP?
You can, but use a decent one. A cheap thin extension cord creates resistance in the line and can cause small voltage drops that the ResMed power supply doesn't handle well, especially the older 65W brick on the AirSense 10. Use a heavy-duty 3-prong extension cord rated for at least 10 amps and keep it as short as possible. A surge protector is actually a smart idea too, I've seen machines fried by lightning strikes on unprotected circuits. Just don't daisy-chain extension cords. One cord, straight to a wall outlet or a quality power strip.