Air in toilet line - normal procedure doesn't work

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Snorp

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My best to all for the help you provide.

Two level townhouse. Two toilets upstairs and one on main level - no basement. I have no clue as to what started this problem but fairly recently I replaced a shower cartridge. The problem Did Not start immediately after that work was done as best as I can remember.

Downstairs toilet Whines very loudly when flushed. Tone can be modulated by running the faucet at various volumes. I followed what I think was the 'standard procedure' for fixing the problem: Shut off water to the house; opened all faucets about half way - starting at the lower level and moving upward; flushed all toilets starting at ground level; left faucets half way open and turned main supply back on; ran water for ten or more minutes; then turned off all water faucets.

Flushed all toilets starting at top floor. The downstairs toilet started to whine - as usual. Ran the sink faucet in the same bathroom and flushed the toilet again. The sink faucet burped once but the whine continued. I read that it's possible that there was a blockage in the drain but there was no evidence that the flush was weak but I added dishwasher liquid and flushed and used the plunger - didn't help.

Read that turning off the supply to the toilet and then removing the line to the toilet - at the toilet - turning the water supply back on and draining water from the toilet line might work. Did this and ran a steady flow of some 4-5 quarts into a pot - no signs of a bubble or air during this process. Area was very tight hence a small amount of water was drained.

Noted that the valve was vibrating but not that severely.

Thoughts? Need a new valve?

I would appreciate any/all thoughts/comments.
Andy
 

Reach4

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"Flushed all toilets starting at top floor. The downstairs toilet started to whine - as usual. "

Did you flush the downstairs toilet before it started to whine? If so, I suspect you should replace the fill valve on that toilet.
 

Snorp

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"Flushed all toilets starting at top floor. The downstairs toilet started to whine - as usual. "

Did you flush the downstairs toilet before it started to whine? If so, I suspect you should replace the fill valve on that toilet.
Thank you Mr. Reach4. Yes, it only whines when it's flushed. I wasn't sure that the valve could be a source for this problem.

Tomorrow I'll replace the valve. I'm confident that that'll fix the problem.
Thank you very much for your help.

Regards,
Andy
 

GReynolds929

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As @Reach4 said replace the offending toilet fill valve with a Fluidmaster. Not the stop valve on the wall, the one in the tank with the float.
 
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