Bernafon Acriva, Инструкция по эксплуатации

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Common Problems and Solutions
Hearing aid whistles or squeals
Check that the earpiece is inserted correctly. If this is
the case and the hearing aid still whistles or squeals,
please consult your hearing care professional.
No volume, level too soft or humming noise
Check if the volume level is too soft and adjust
by increasing the volume level with the control
on your hearing aid. If you have no volume at all,
check whether the hearing aid is in mute position.
If the problem still occurs, check that the battery
door is closed completely. Also check if the battery
is inserted correctly. If the problem still remains,
change the battery. If the problem still persists,
contact your hearing care professional.
Whirring noise, fading, weak or motor-boating
sounds
Open and close the battery door several times or
clean the battery contacts carefully with a dry cotton
swab. If the problem still occurs, change the battery.
If the problem still remains, contact your hearing care
professional.