Mine is doing the same thing. I tried running the water pump, but didn't think to use hot water. I have a 2018 hurricane. I can't even locate the pump. So far, no one I've ask has an idea where it is. I even have a call into my dealer service and they are stumped, but still looking. The problem is, when the pump is on the pipes reverberate all through the coach so it's hard to follow the sound.