I would suspect that the flush valve has a blokage in it that is causing a harmonic distortion to be transmitted thru your cold water piping.. One way you may be able to help this is to slow fill rate down on your flush valve. If your fush valve has a seperate float to shut off water supply to tank when it;s full there should be a adjustement screw onside of valve where float rod goes in. Adjust screw down to raise float and thus slow fill rate of tank, this should help with the noise. Ifyour toilet does not have adjustable float see if you have a valve on incoming water supply. If you do you can try slow down flow thru supply valve and see if that helps, Thanks
I recently had the same problem. to let you know I replaced the filler and the flapper to NO avail.
I tried flushing with the water OFF and it still did it thought it was in the siphon so I removed the water going in there and it still made the sound.
This AM it got to me so I was determined to be rid of the WHINE
It only happens when the TOP is on that is when it hit me is the seal so great that the vacuum creates the whine I put the little rubber door stops, the one you use in door jams, on the four side and tada no more sound Hope this helps
what do you mean by on the four side?
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