Did a drain and fill yesterday. Now i have a loud banging (ball bearing ball continually bouncing). I shut off the unit and cleaned the top. Both back fans have air moving and are working. I thought it was top fan for the light, but when you put your ear to the top, it sounds like its coming from the bottom or bottom left of the unit. But its just in regular flower lights on mode, so nothing is being used? So a fan? Yes? Am I crazy? I have spare fans if i have to turn this off and put something on, but my wife wont be able to do homework with this noise, you can hear it on a different floor.
Anyone else have this problem? What was it?