Our neighbors enjoy a roast pump that have a exceedingly loud ringing nouns when it is on. What could be wrong near it?

About 3 weeks ago we started to hear a very loud and annoying ringing nouns coming from our neighbor's house. My husband determined that it was coming from the bake pump when the air conditioning is running. We contacted them, but we enjoy not received a response. It would be helpful to know what might be cause the problem before we try contacting them again. We hold lived here 18 years and this sound have never occurred in the past, and it wakes us up during the darkness. Any information would be greatly appreciated.


Answers:    My guess would be that either the enthusiast has a bent blade and is hitting the guard or the guard have lost at least one hook and is going into the fan. (vibrating)
A loud sril nouns , it sound similar to a Bearing. When they ware out they sing loud.Almost gone if it is that loud.
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