Instruct: Classify the given Amazon review into its appropriate rating category
Query: Defective Fish Tank Heater

I was exited to purchase this heater for my fish tank. The reviews are good and this is a great brand (I have other items in this brand and they all worked long-term). BUT, I was upset to discover that the heater quit working after only using it for 6 weeks. I was wanting to return it or exchange it but the ad did not give me that option. This is very discouraging!!