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

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My shower valve changes water temp in a near by sink

If I turn on hot water in my bathroom sink only gets Luke warm, but if I leave water off in shower and only turn the thermostatic temp control to hot, immediately water in sink gets hot or very hot depending on what temp I set the showers valve at. I'm stumped? I did recently replace my hot water heater. Could there be some sort of issue there or is the problem in my fancy showers mixing valve? This actually has the same affect in other areas of the house. Guest bathroom has same problem. But I have a mixing valve in that shower too. Help!!!!!!!!!!

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

gary1121
  • 332 Answers

SOURCE: 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

Posted on Jun 06, 2009

gary1121
  • 332 Answers

SOURCE: 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,,

Posted on Jun 21, 2009

snap101
  • 117 Answers

SOURCE: grohe shower

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

Posted on Jul 29, 2009

pipesster
  • 20 Answers

SOURCE: The temperature in my shower is very luke warm

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.

Posted on Jan 25, 2010

  • 35 Answers

SOURCE: I have a thermostat mixer shower but hot water has

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

Posted on Feb 19, 2010

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Why does the water temp delivered from two Visu-temp valves in back to back bathrooms turn lukewarm after about 4 minutes.


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If you have single-handled faucet the faucet cartridge might be bad.
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If you aren't getting any error codes, then the heater is probably doing its job. Your problem is probably somewhere in your plumbing system. The most common reason you get this sort of problem is due to cold water mixing in the hot water system. There are a number of causes for a "cross connection" :

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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...

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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