One of my heat pumps is suddently making an almost machine gun like sound. It was running normally, and then suddenly went into this noise. I have shut it off. Sounds like a muffler with a hole in it. Any one have any idea what this could be?
Before I call back my installers I just want some sort of feel as to what this might be so I will be more educated. I've had problems with my installers in the past and am therefore a bit fearful of them working on this unless I can speak with them about it knowledgeably.