Hearing aid makes a whistling sound

Whistling (feedback) occurs when amplified sound returns to the microphone and is re-amplified. This happens with all microphones. Most hearing aids (even ones costing thousands of dollars) whistle when not ins...

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Hearing aid has a weak or no sound

Make sure the battery is inserted correctly. Make sure battery is fresh. If there is any doubt, try a new one (where you have to remove the sticky flap off the battery surface, let new battery stand for 1 ful...

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Sound is distorted or intermittent

Open and close the battery door (or for the PRO, Flick on/off switch back and forth), in case dust or lint has collected in the hearing aid. Check the battery contacts to be sure they are not corroded. If t...

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