ResMed CPAP Won't Turn On: Causes and Fixes for AirSense 10 and 11
Quick Answer
When a ResMed AirSense 10 or 11 will not power on at all, the most likely cause is a failed or disconnected power supply, not the CPAP device itself. The external 24V DC power brick has a known failure mode where the internal capacitors degrade after 3-5 years, especially in humid environments.
When a ResMed AirSense 10 or 11 will not power on at all, the most likely cause is a failed or disconnected power supply, not the CPAP device itself. The external 24V DC power brick has a known failure mode where the internal capacitors degrade after 3-5 years, especially in humid environments. Before assuming the CPAP is dead, check the wall outlet with another device, inspect both ends of the power cord for loose connections, and look for the small green LED on the power supply brick itself. If the power supply LED is off, the brick has failed and a replacement costs $30-50. If the power supply LED is on but the device still does not respond, the internal power board may have failed, which requires DME service.
What Does the WONT-TURN-ON Code Mean?
A ResMed CPAP that will not turn on is usually caused by a failed power supply brick, not the device itself. Check the outlet, power cord, and power supply LED before contacting your DME.
Most Likely Causes
Based on aggregated repair data, here is the probability breakdown for this error code:
Symptoms You May Notice
- No response when Start/Stop button is pressed
- Screen is completely dark
- No fan noise or air movement
- No indicator lights on the device
- Power supply brick feels cold (normally slightly warm)
Can you reset a Resmed cpap to clear the WONT-TURN-ON code?
If the device has no power, a menu-based reset is not possible. Perform a hard power cycle by unplugging the power supply from both the wall and the device for 60 seconds, then reconnecting. If the device does eventually power on: AirSense 10 - Settings > Device > Reset Device. AirSense 11 - My Device > Factory Reset.
Tools Required for Diagnosis
Diagnostic Checklist
Follow these steps in order. We start with the easiest external fixes before opening up the machine.
Test the wall outlet
Test the wall outlet. Plug a phone charger or lamp into the same outlet to verify it has power. If the outlet is dead, check your circuit breaker panel for a tripped breaker or press the reset button on nearby GFCI outlets.
Inspect the power supply brick (the box in the middle of the
With confirmed power reaching the device
If the device remains dead with a confirmed good power supply
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 Unit (24V DC, 90W)N/A · $0–$0 | N/A | $0 – $0 |
| ResMed AirSense 10 Power CordN/A · $0–$0 | N/A | $0 – $0 |
Repair vs. Replace Calculator
Frequently Asked Questions
Can I use a third-party power supply for my ResMed CPAP?
My CPAP died in the middle of the night - what should I do?
Does a power surge void my ResMed warranty?
Related Resmed Cpap Error Codes
Models Known to Experience WONT-TURN-ON 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, AirCurve 10 VAuto, AirCurve 10 ST
Last verified for technical accuracy on March 15, 2026