Question about Kohler Thermostatic Controller K 683 1 [ K 683 K, K683K, K683 K, K-683 K, K683 ] Fan

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Problems with mixing valve on k-683

Temperature fluctuates during shower, was told could be issue with mixing valve, thermostat valve, circuit board or debris, calcification in plumbing into valve

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  • kimberly romano Feb 10, 2012

    does that sound right? It is less than a year old?

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SOURCE: Very little cold water from shower valve

If this is a new installation and has always beenj this way, then I would suspect that there may be an obstruction in the cold water line leading to the valve. Or something stuck in the valve at the point where the cold water is connected. If someone has worked on thius valve recently , then I would suspect that they got the valve cartridge in backwards, If the catridge is not placed in the valve correctly the opperation is messed up.

Posted on May 06, 2010

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1 Answer

Could my grohe thermostatic shower be letting cold water into my system? Some other taps run cool but the shower is running OK temperature


If you have single handle facute one bad cartridge in the system may be acting like a mixing valve and allowing cold water to mix with hot not allowing water to get hot enough .

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Hot water tank does not work when shower is on, it does however work when the faucet in bathroom is on. It quit working in the shower about a month ago.


  1. COLD MIX, HEATER DEACTIVATES
    If inlet water temperature is over 70°F due to geographic location, water maybe very hot out of the tap. This requires a lot of cold water to be added with it in order to attain a useable hot water temperature. The addition of too much cold water will overpower hot water demand from the tankless water heater. This slows the flow within the tankless water heater, decreasing it below activation point, which shuts off the heater. The end result is nothing but cold water coming out of the outlet. See: TWH E2-04 Overcoming fluctuating temperatures [PDF].
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    If the water pressure in the home is erratic and the water flow is not consistent while a tap is opened, then the temperature of hot water will fluctuate. The minimum water pressure for the home should be 30psi or greater. For people on well systems the minimum pressure range is 30-50psi. The use of a pressure reducing/regulating valve is an effective way to maintain constant water pressure to the water heater. Watts brand 25AUB- ¾" or N35B-¾" pressure reducing/regulating valves or equivalent is suggested.
  3. CHANGING FLOW RATE
    Major changes in flow rate can adversely affect the output water temperature of the heater. Increases from one major fixture running to multiple fixtures running at one time can cause the temperature to fluctuate. Stay within the heater's specifications. See: TWH E2-03 Outlet temperature vs. flow rate [PDF].
From the Bosch website.

Good Luck,
Gary

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1 Answer

Fluctuating temperature now got un bearable, ive de scaled shower head totally and cleaned filter !!!!!!!


Test: take the shower head off, then run water. If the water can be adjusted to the desired level (hot/cold mix), then the problem is probably in the shower head. Contact the manufacturer of the shower head. If you cannot maintain a good mix, the problem may be in the valve behind the wall or a total house pressure problem---time to get out your wallet and call a plumber.

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1 Answer

How do I remove grohe shower trim?


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This is what you should have... Grohe Grohmix Thermostat Valve & Trim - 34436
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    Water temperature varies while useing the hot water during a normal shower. jg


    Try this before replacing the shower diverter valve.

    If this problem is isolated to the shower only, then I would suggest that the shower diverter valve is equipped with an "Anti-scald" safety feature that can not be adjusted, however the temperature regulator/thermostat on the water heater can be adjusted to a lower temperature so as to not activate the the "Anti-scald".

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    Water Temperature


    hi,

    from what you have described it sounds like a thermostat problem.either scaled up or the filters could be blocked?
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    you will need some specialist tools but you need to identify what model 1st & then we can go from there?

    Kindly

    Richie

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    Thermostatic Valve Shuts Down on Full Volume


    I would check the strainers/filters becuase clogged strainers can lead to decrreased water pressure and therefore improer mixing... there may be strainers at the supply valves, at the intake to the faucet and the cartridge...

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    Rinnai R53 Natural Gas Tankless Water Heaters


    It sounds like the Rinnai units are working correctly but you've got some plumbing problems.  Any tankless heater has a minimum water flow required to keep the burners going.  If the burners were going with very little water flowing through them to carry the heat away, the heat exchanger could overheat and fail.  The solution is generally to the electronic controls to set the desired temperature and then just use hot water.  Once you start mixing cold water in, you actually reduce the flow of hot water and the burners turn off.  If you are right near the cut off point, the burners will cycle on and off resulting in those very annoying hot-cold-hot-cold showers.  
    The fact that you've got those very loud noises indicates some other sort of plumbing problem.  Hooking up two tankless units in series is much more complicated. In heavy draw situations, the second unit is asked to finish heating the water up to temperature when the first unit couldn't quite get it there. Now you're putting hot water into a heater and heating it more.  You have a lot more issues with fluctuating temperatures and pressures within the pipes which could conceivable cause these horrible noises.  Everything's got to be set up right to for things to function properly and it's easy to get something wrong.
    From your description, it sounds like a better solution would have been to mount the two heaters in different places. e.g. One in the basement to serve basement and first floor faucets.  The other on the second or third floor to serve those two floors.  Since these units are direct vent (don't use inside air), they can even be mounted in a closed closet as long as the vent can get to the outside.  With this setup you avoid the complexities of a series installation and you also have a much shorter wait time (and therefore less waste) for the fixtures on the upper floors. 

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