My pool heater (Gulfstream Heat Pump) is making more than normal noise this season and has a vibration going on in the condenser fan or motor. All seems to be working fine but the noise from the vibration is anoying to hear when trying to sit at the pool. I am thinking that the fan blades are somehow out of balance. I dont know how they got that way but I suspect the got whacked maybe by a falling something or another. There is no dent to indicate this though. There is no screaching sound as if the bearings are ceasing up. There is a shaking though and the resulting noise. Its not too bad but I feel I should address it before it becomes worse or causes bearing failure. Any help or insights would be appreciated.