What happens if your harmonica isn't making sound when breathing in?

If your harmonica isn't making sound when breathing in, it may be due to a few common issues. First, ensure that the harmonica is clean and free of debris that could obstruct the airflow. Additionally, check that you're using the correct technique, as a gentle but firm inhale is necessary to draw air through the reeds. Lastly, it could indicate that the harmonica is damaged, such as having broken reeds, which may require repair or replacement.