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Hi, I'm Mike G and I'll be glad to assist you. Do you have a 2 wire voltage tester? You'll need to open the fan canopy, check the connections and verify that there is 120V.
If you have a fan that stops working intermittently it is likely a bad connection is making and breaking. That's why I said to check the connections in the canopy. Unfortunately most installation aremade without strilping the fan leads longer. When not longer than and leading into the wirenut, the connection will fail. Wire heats and expands contracts when cool. This makes the fan lead walk out and arc causing the on and off ability to use the fan.