CPAP therapy is an important part of many people’s sleep-apnea care. A machine, mask, tube, humidifier, filter, and power supply all need regular attention. When something changes, a few safe checks can help you identify whether it is a simple setup issue or a reason to stop using the device and contact your equipment provider.
Important: This guide is general education, not medical advice. Follow the instructions for your exact device and do not change prescribed pressure settings unless your sleep clinician tells you to. If you depend on your device and cannot use it safely, contact your healthcare provider for an individual plan.
1. The CPAP Machine Will Not Turn On
What you may notice: The device will not start, or the screen stays dark.
Safe checks:
- Test the wall outlet with another device you know is working.
- Confirm that the power supply and machine connector are firmly seated.
- Inspect the cord and power supply for visible damage. Do not use a wet, frayed, or damaged cable.
- Use only a compatible power supply recommended for your device.
If the device still does not start, contact the manufacturer, seller, or a qualified service provider. Do not open the machine housing or attempt internal repairs.
2. Unusual Noise During Use
What you may notice: A whistling, hissing, rattling, or other sound that is not normal for your setup.
Possible external causes: A hissing sound can be caused by a mask leak, a loose tube connection, a poorly seated humidifier chamber, or a damaged tube. Check that the mask cushion is fitted correctly and that each connection is secure. Inspect the tubing for splits, kinks, or moisture. Clean or replace the air filter according to your device instructions.
A mechanical or unfamiliar noise from the machine itself should be treated cautiously. If the sound continues after basic external checks, stop using the device and seek professional support.
3. Pressure Feels Different Than Usual
What you may notice: Airflow feels weaker or stronger than normal, or your therapy experience changes suddenly.
Safe checks:
- Look for mask, tube, or humidifier-chamber leaks.
- Make sure the tube is not sharply bent or blocked.
- Check whether the air filter needs cleaning or replacement under the manufacturer’s schedule.
- Confirm that the device is placed on a stable, level surface with vents unobstructed.
Do not try to recalibrate the device yourself or alter the prescribed settings. If the problem remains, contact your sleep clinic or equipment provider for a professional check.
4. Data or SD Card Problems
What you may notice: The device cannot read an SD card, therapy data is missing, or displayed data looks unusual.
Remove and reinsert the card gently, making sure it is fully seated. If the problem continues, use a compatible replacement only if your device instructions allow it, and ask your provider for help. A missing SD card does not always mean therapy has stopped recording—many devices store data internally—but the correct answer depends on the model.
Everyday Care That Helps Prevent Problems
- Clean as directed: Wash removable mask, tube, and humidifier components only as specified in your manufacturer’s instructions. Mild soap and water are commonly recommended for removable parts; never immerse the powered machine in water.
- Maintain filters: Clean or replace filters on the schedule recommended for your exact machine.
- Avoid sharp bends: Keep tubing routed so airflow is not restricted and the tube is not crushed or damaged.
- Keep the device dry: Store it in a clean, dry, well-ventilated place away from excess heat and humidity.
- Use approved cleaning methods: Follow the device manufacturer’s guidance. Do not assume that ozone or UV cleaning products are compatible with your CPAP equipment.
Stop Using the Device and Get Help When
Unplug the machine and contact your provider or manufacturer promptly if you notice water inside the device, a burning smell, smoke, overheating, an electrical-shock sensation, significant drop damage, a major change in performance, or persistent unusual sounds. Do not reconnect a device or power cord that is wet or visibly damaged.
A Final Note
Routine inspection and care can make CPAP therapy more dependable and comfortable. When in doubt, keep the user manual close by and contact your sleep clinician, device manufacturer, or equipment provider rather than attempting an internal repair.
Helpful safety resources: FDA guidance on signs of CPAP device problems and FDA guidance on CPAP cleaning products.
