It is quite common for your hearing aids to whistle if they are turned on but not fitted into your ear. Whistling from a hearing aid during insertion or removal from the ear is quite normal if the hearing aid is switched on
Check that your hearing aid is correctly inserted into your ear
Hearing aids can whistle if there is wax in your ear or in the hearing aid
Clean your hearing aid thoroughly using the equipment provided
“Feedback” is sometimes caused when the volume control is adjusted and your hand reflects the sound back into the instrument’s microphone. This should cease when you move your hand
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