Question about Grohe Grohmix Thermostat Valve & Trim - 34436

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Installed new cartridge in grohe shower valve. The hot water flow is reduced and when you play with the handle between hot and cold the water flow increases?

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Low pressure

Posted on Jun 23, 2011

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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 .

Mar 10, 2015 | Grohe Water Heaters

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My contractor installed a 4 port diverter. The hot and cold are ok, but when I turn the shower on, the flow starts in the hand held shower head and not the main shower head. According to Grohe, whichever...


I haven't had a lot of experience with Grohe brand but have had twenty eight years as plumber, 22 years as master plumber and the bottom port of every tub or tub/shower valve that I installed used the bottom as main supply port. As far as the instructions from manufacture like I said I have not used that particular brand much,so I really couldn't say. Hope this helps some. Thanks

Nov 10, 2010 | Grohe Grohmix Thermostat Valve & Trim -...

1 Answer

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...

1 Answer

I cant adjust water temp 0n a single handle kohler shower valve


4yrs isn't very long, but I do believe the mixer needs a new cartridge in it. unless you have a loose knob/handle.But I don't thnk so. The temps should change almost immediatley. Have someone change the cartridge. It may need a special tool. If you think you can, do it yourself, the tool comes with full instructions. Make sure it does, consult with the pkumbing person .

Nov 09, 2009 | Water Heaters

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...

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

Grohe bath faucet adjustments


grohe is a faucet all by itself ,,, I would recomend to have you call there repair dept. and explain this to them, you said you put in the new cartridge and thats about all there is to it, when you put on the handle make sure it is not over tightened, sometimes it pulls on the cartridge and makes it come on by itself good luck

Feb 21, 2009 | Grohe Integrated 1/2'' Shower Thermostatic...

1 Answer

Grohe Thermostatic Valve


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

Feb 10, 2009 | Grohe Integrated 1/2'' Shower Thermostatic...

3 Answers

Water is either hot or cold - no in between.


I found a way to get warm water in the shower, but I'm not sure it qualifies as a solution. After trying everything else I thought that maybe when I was feathering the faucet in the shower toward the cold side so I would get warm water that at a certain point it blocked the flow on the hot water side enough so that the sensor in the hot water heater sensed there was no demand in the line and it shut the water heater off. To test this, I went to the kitchen and turned the kitchen sink faucet all the way to the hot side and then turned it on so that I got a small flow of water. I waited for the water to get hot to be sure the hot water heater was working. Once it was hot, I left it running to keep demand in the line and then I went to the shower and turned the faucet on. When the water got hot I started feathering the control towards the cold side and soon I had warm water. So I think I'm right in that the sensor in the hot water heater was shutting the water heater off when the demand in the shower was lowered to a certain point when I was trying to adjust the water temp in the shower.

So now I can get warm water, but it means I have to leave the hot water running at another fixture in the house to create a false demand in the system so the hot water heater doesn't shut down. Is there a way to adjust the senor in the hot water heater so that it will stay on when I'm using the shower only, so I don't have to waste water by running another faucet when I want to take a shower?

Nov 28, 2008 | Water Heaters

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