First, make sure the appliance is unplugged and has cooled completely. You'll want to check a few things.
1. Place the coffeemaker on a hard, flat, level surface. An uneven surface can interrupt airflow and potentially cause issues.
2. Do not operate it with an empty water tank. Always make sure there's water in the reservoir before turning it on.
3. Check the glass carafe. If it is cracked or chipped at all, you must discard it immediately and get a new one. Do not use a damaged carafe.