Report "We have a unit installed in our RV. We did not use it last year. Just now, when we try to use it, we get the continuous beeping indicating a problem with the motor. I have taken the insides out to the point that I have removed the impeller and find that it turns very, very sluggishly. I can move it by hand, which is better than when I first got to it by simply lifting the rack and removing the filter plate but my thought is that it should spin very freely on its own. Is this the problem? Aside from replacing the unit, are there any things I could try? I am soaking the unit in hot, soapy water at this time I have also checked and cannot see anything like hair or string or other debris that may have wrapped around the impeller shaft. Thanks for any help you can provide. Al Cox"