Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Stopped working in under 15 minutes

After cleaning an area approximately 4'x 5' the machine started to smoke. We immediately shut it down. We tried to turn it on again after checking the machine over, and it would not turn on. We called Hoover and could never get through to a live person. The only option was to leave a message and they promised to return the call. We also emailed the company. We never heard back from them. Thank goodness for Amazon! They had the machine picked up within 2 days at no cost to us and we received a full refund.