ResMed CPAP Error 6: Mask Leak Error on AirSense 10
Quick Answer
ResMed CPAP Error 6 is a common issue that can usually be fixed at home. Most commonly caused by mask shifted during sleep breaking the seal. Also check cushion partially unseated from the mask frame. Start with a power reset (unplug for 2 minutes). If the problem returns, follow the diagnostic steps below from most likely to least likely cause.
ResMed Error 6 is a mask-interface leak code on the AirSense 10 that is triggered by the device's continuous flow monitoring detecting unintended air loss at the mask. The AirSense 10's algorithm distinguishes between the expected intentional vent flow built into ResMed mask designs and unintended leaks - Error 6 fires when unintended loss is detected at a level that compromises therapy. This is distinct from Error 21 (sustained large leak above 24 L/min) and more commonly reflects an acute seal failure: a mask that slipped during sleep, a cushion that is partially unseated, or headgear that became loose. Because the AirSense 10 uses AutoSet algorithms to modulate pressure, an uncorrected leak also causes the device to ramp pressure upward trying to compensate, which can cause discomfort. Fixing the seal at the mask level is the primary resolution path.
What Does the 6 Code Mean?
Error 6 is a mask leak error - the device detected air escaping the mask circuit outside the intended vent. Fix the mask seal to resolve it.
Most Likely Causes
Based on aggregated repair data, here is the probability breakdown for this error code:
Symptoms You May Notice
- Error 6 displayed at end of session or during therapy
- Waking to find mask displaced on face
- Hissing sound from mask edges
- Dry mouth or dry eyes in the morning
- Device pressure felt to increase throughout the night
Can you reset a Resmed cpap to clear the 6 code?
AirSense 10: hold the home button for 5 seconds, navigate to Settings > Device > Reset Device. AirSense 11: Settings > My Options > Device Options > Reset.
Tools Required for Diagnosis
Diagnostic Checklist
Follow these steps in order. We start with the easiest external fixes before opening up the machine.
Perform a seated mask fit check before the next therapy session
Perform a seated mask fit check before the next therapy session. Put the mask on as normal and start therapy. Check the leak indicator. Adjust the top headgear strap to stabilize the mask on your nose bridge, and the lower strap to hold the chin cup if your mask has one. The mask should seal without you pressing it to your face.
Remove the cushion from the frame and check that it clicks fully
Manage your hose routing to reduce mask pull
Perform a device restart (unplug 30 seconds and replug)
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 |
|---|---|---|
| Replacement mask cushion for your specific AirFit mask modelN/A · $0–$0 | N/A | $0 – $0 |
| Replacement headgear strapsN/A · $0–$0 | N/A | $0 – $0 |
| CPAP hose management clip or CPAP pillow with hose channelN/A · $0–$0 | N/A | $0 – $0 |
Repair vs. Replace Calculator
Frequently Asked Questions
What is the difference between Error 6 and Error 21?
My mask fits fine when I put it on but I get Error 6 in the morning. Why?
How do I know if my mask cushion needs replacing?
Related Resmed Cpap Error Codes
Models Known to Experience 6 Errors
This repair applies to most Resmed cpaps with this error code. Common model numbers include:
AirSense 10 AutoSet, AirSense 10 CPAP, AirSense 10 Elite, AirSense 10 For Her, AirSense 11 AutoSet
Last verified for technical accuracy on March 15, 2026