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.


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?

  • 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 '14 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 '14 at 5:25
  • original pipes copper and some pex used. – brad May 30 '14 at 13:28

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