Whistling usually means sound is leaking out and getting picked up again by the microphone.
- Make sure the hearing aid is inserted properly.
- Try a larger eartip for a better seal.
- Check for earwax buildup.
- Keep hands, hats, or pillows from pressing against the hearing aid.
Need more help? Contact Ceretone Support at (866) 283-4262 or support@ceretone.com.