when shutting off fixtures throughout the house, a deep moaning horn sound emits through the pipes.....this occurs no matter which fixture is used and sometimes the noise occurs just out of the blue. Any suggestions?
Because it's caused by any and all taps, it must be in something common to the whole system. For lack of any better ideas, I suggest you go to the crawl space (or basement?) and have someone else make it fail. You might be able to find the problem by following the sound.
I have the same problem. What are we supposed to do when we find where it is coming from? I think mine comes from where my home filter is installed. I changed the filter and still have the problem. What do I do?