Grohe 34.122 shower valve ID - not mixing cold and hot water

[Cory Hank]

Moved into a house a couple months ago and the temperature of the water coming out of the shower valve is basically un-adjustable.

The temperature of the water on the hottest setting is barely different from the coldest setting, so I have just been taking really hot showers.

I tried to find model number (and therefore the user manual) to learn how to take it apart, but a lot of googling got me nowhere for this particular Grohe model.

1. Can anyone ID this?

2. How do I take this apart?

I assume I only need to replace a part of the valve to get the hot and cold water mixing properly.

Thank you for reading my questions.

 

[Terry]

https://terrylove.com/forums/index....therm-34-122-thermostatic-shower-valve.40701/

47.050 thermostatic cartridge

https://www.chicagofaucetshoppe.com/Grohe-34-122-s/4962.htm

https://www.grohe.us/en_us/thermostat-rough-in-valve-34122000.html

 

[Sponsor]

 

[Cory Hank]

Thank you so much Terry, that was immensely helpful!

 

[Cory Hank]

In case anyone runs into this problem in the future. Here is what fixed the problem.

Take apart the trim. The outermost part of Part 45 763 in the diagram below unscrews just by hand. The diagram is slightly misleading. A screwdriver is then needed to detach the screws holding the handle.

Then follow these directions.

My regulating cap was green in color. I guess it got loose over time. I screwed it on tight by turning clockwise.

Now the water temperature is adjustable. The range is not that great, but at least no more scalding showers!

Thank you Terry.

 

[FcM]

In case anyone runs into this problem in the future. Here is what fixed the problem.

Take apart the trim. The outermost part of Part 45 763 in the diagram below unscrews just by hand. The diagram is slightly misleading. A screwdriver is then needed to detach the screws holding the handle.

Then follow these directions.

View attachment 54925

My regulating cap was green in color. I guess it got loose over time. I screwed it on tight by turning clockwise.

Now the water temperature is adjustable. The range is not that great, but at least no more scalding showers!

Thank you Terry.

Hello; Quick question how do you take the thermostatic off, talking about the white piece with the numbers? Thanks

 

[Breplum]

I believe the index snaps on. I don't recall any tiny screw in the stem.

 

[FcM]

I believe the index snaps on. I don't recall any tiny screw in the stem.

Thank you. I guess I just need to pull on it or is the a trick to unsnaping it.