Kohler K 304 Rite Temp Pressure Balancing Valve Logo

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Posted on Jun 22, 2011
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I have a Kohler K-304 shower mixing valve which is several years old but is only used occasionaly. Worked fine at first, but now it will not provide any hot water- no water when all the the way to hot. Have adjusted the stops to allow for maximum hot water. I have remove to the mixer cap to see if there is any blockage- there is none. I have not attempted to remove the pressure balance unit. What do you suggest?

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  • grkaem Jun 22, 2011

    Unfortunately my shut off is a distance from the shower mixer and I am working alone. When I blow through the cold water side of the pressure balance unit there is no resistance, but when I blow through the hot water side it is completely restricted. Would that mean the problem is in the pressure balance unit? Thanks.

  • grkaem Jun 23, 2011

    Yes this was very helpful. Now I know that I have to replace the pressure balance unit which I understand is an expensive part. Possiblly I can get Kohler to provide under their lifetime warranty....

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  • Kohler Master 43,501 Answers
  • Posted on Jun 23, 2011
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Hi,
The problem is that the pressure balance unit is stuck...therefore no hot water...it is not sensing the cold water pressure....so it will not allow hot water to flow...
The lack of use is actually a bad thing as the rubber and such can adhere to the metal and stick the unit...
You maybe able to free it up, but it probably will never work correctly...
I would just replace the pressure balance unit to be sure that it is working correctly and safely...

heatman101

  • Anonymous Nov 25, 2011

    Thanks. Having cold and hot solved the same problem for me!

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  • Master 1,015 Answers
  • Posted on Jun 22, 2011
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I think you are going to have to finish disassembly to find what it is that is blocking the hot side. I would guess a bit of rust or mineral build up. This is made worse by lack of use. If you havn't already try turning the water supply on very slowly while you have the valve most of the way torn down so you know you have water to that point. Best of luck and thank you.

  • Anonymous Jun 23, 2011

    It sounds to me like the check valve inside the balance unit is stuck shut. I have checked for repair parts but all I can find is almost the price of a new valve. Sorry I can not be of more help. Thank you.

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