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When the faucet is turned up to hot water max position, the pipes vibrate and the water stops coming from the shower head. I have adjusted the red plastic knob for the maximum position and even tried without the red knob and still the same. There is a green knob behind the red one but I am unsure if he is suppose to be adjusted or how to remove. I have turned up my hot water heater and all other faucets are receiving plenty of very hot water.

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The hot water inlet side of your valve may be clogged with rust or mineral deposits. I have had that happen before. In my case there was a galvanized steel pipe section screwed directly into a copper pipe section, which always causes rust in the pipe (galvanic corrosion).

Based on having the red and green adjustments, this sounds like a single-handled valve with a cartridge in the center. You will need to remove the valve cartridge to clean out any deposits.

Is this a newly-installed valve in the shower, or is it an existing valve that just recently started having problems?

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  • This is a new faucet that was installed during a remodel about 5 years ago. No problems til now...yes it is a single handled valve. I just bought a new one and installed and still have the problem.
    – brad
    May 29, 2014 at 22:54
  • Hmm, that's frustrating. What kind of pipes are they between the water heater and this valve? Any chance there is a mix of steel (galvanized) and copper?
    – Grunthos
    May 30, 2014 at 5:25
  • original pipes copper and some pex used.
    – brad
    May 30, 2014 at 13:28

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