Question about Grohe Integrated 1/2'' Shower Thermostatic Rough-In Valve With Stops - 3412

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My thermostatic mixer shower will not turn off

My plumber is fitting my thermostatic mixer shower and he cant get it to turn off

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He probably put it together wrong.
there is usually a blue gasket inside for testing purposes, if that is not removed, the valve will not turn off.

Posted on Aug 15, 2010

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Hot water heater has hot in tank but dose not come out of hot water line on tank


most electric hot water systems use a heat transfer process where the element is in one tank and the house water is in another
the house water is what is being drawn off when you turn on a tap
there is a regulator valve at the top of the tank with a small lever that you open up to let water in and air out of the system
another point is that there may be a hot/cold mixer on the hot water outlet which limits the temperature of hot water to prevent scalding injuries in the bath and shower or sink
If you have one fitted they are known to malfunction and cut the hot water temperature down as, they mix too much cold water into the hot water pipe.
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Hi,

If the hot and cold are fitted the wrong way round then the thermostat on the shower unit cannot operate properly!

Most thermostatic mixer showers have a 'bi-metallic' thermostat, if you supply the hot to the cold and vice versa IT WILL NOT WORK.

It is like wearing the left shoe on the right foot and the right on the left! It doesn't work.

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I hope this helps.

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