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

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Grohe bath faucet adjustments

When I turn on the hot water side of the fixture, it turns itself off. I have to continually open the faucet to keep any level of water flow until the water gets hot. Then it stays put. The cold side is the same (for the first part) but the flow tends to increase all by itself.

I replaced the guts of the faucet, thinking it was just worn, but I still get the same thing.

The faucet is a Grohe 21.175

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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

Posted on Jun 06, 2009

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Posted on Jan 02, 2017

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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.

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