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

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Little hot water

I am having too turn the dial nearer to its max to get any sort of hot water, the shower is a grohe thermostatic which the body of it sits behind my shower enclosure

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  • JUDYWOLF Feb 03, 2009

    Turning the knob all the way to the hot site, produces cool water. This is a new problems; it has worked just fine before.

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  • 34 Answers

Is it only in the shower?

Posted on Feb 09, 2009

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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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I have a thermostat mixer shower but hot water has become minimal recently, even when water is piping hot from the taps? The shower is fed from cylinder tank on 1st floor, and cold water tank is in the...


The thermostatic mixing spool cartridge may be worn out. The low water pressure may indicate sediment in the cartridge as well. This can be easily removed by hand tools

Feb 17, 2010 | Grohe Integrated 1/2'' Shower Thermostatic...

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Grohe valve Grohtherm Thermostatic Rough 34-126 I turn the mixer to full hot but the temperature remains tepid. All the other faucets in the


The thermostatic stop is set too low. Havent set a grohe before but most other thermostatic shower valves work similar. pull off the handle(however a grohe handle comes off . . ) there should be a notched ring or stop which keeps the handle from going all the way hot. pull out the ring and turn it a few teeth hotter put back and reinstall handle try water temp and adjust again if necessary.

Jan 23, 2010 | Grohe Grohtherm Thermostatic Rough-In...

1 Answer

The temperature in my shower is very luke warm only at the shower


Do you mean the other faucets in the house are hot and only the shower is warm? If so there is an anti-scald adjustment on the faucet that needs to be turned up a few notches. Havent adjusted a Grohe faucet but most faucets you rmove the handle and behind the handle is a nothced adjustment ring that prevents the faucet from getting too hot. This ring, or stop, is pulled out and twisted clockwise(or counter clockwise to set higher or lower max temp, then pushed back. maybe you can look up grohe to see which way ring or stop adjusts for hotter water.

Jan 23, 2010 | Grohe Integrated 1/2'' Shower Thermostatic...

1 Answer

Grohe shower. I want to adjust the temp mixing valve. I can not get cold water. It is always a mix-never pure cold. I want cold water. How do I adjust it?


if you pull the handle off all the way back to the valve body there is a little black stopper around the cartridge body that you can adjust by pulling it out and sliding around the cartridge body this enables people to just turn the handle to one setting and jumpping in to their favorite temperature. in your case it doesn't allow you to have any cold water. so turn it one way see if you get what you want or try the other or some of them you can even just take the darn thing out and not even have to worry about it

Jul 29, 2009 | Grohe Integrated 1/2'' Shower Thermostatic...

1 Answer

My thermostatic concealed shower valve only gives either boiling hot water or cold water, there is no inbetween temperature? the cold is fed from mains and the hot from a combi boiler. the plumber has said...


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.

Re-install the hot and cold to the correct supply, and this will sort it.

I hope this helps.

Jul 07, 2009 | Grohe Integrated 1/2'' Shower Thermostatic...

2 Answers

I have exactly the same problem


you need to change the cartridge, it is a temp control and is going bad so it keeps you from burning yourself it is like a mixing valve and is givng more cold water, that way you don;t get burned,,

Jun 18, 2009 | Grohe Integrated 1/2'' Shower Thermostatic...

1 Answer

Adjusting water flow


if you are using a mixing valve it is pre set so as to not burn your self but if you wish to set it on the dial depending on which one you have, some are flat tip screw driver some have plastic cap on it turn on the water and set to your desired temp by turning clock wise or counter clock wise

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1 Answer

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the temp, control valve is getting to hot!!! there for only let so much hot water go thru, did you take the inner parts out when soldering this in, if not you might have damaged it, and if so need to replace the cartdrige

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