Question about Grohe Integrated 1/2'' Shower Thermostatic Rough-In Valve With Stops - 3412
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Posted on Jan 02, 2017
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
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
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.
Posted on Jul 08, 2009
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
Before you install the temperature control knob, adjust the valve body (47111) with a wrench to set the temperature to "100 degree or close to it". Now, place the limit ring to tdc (top dead center) and control knob with the red 100-degree align to it. Your problem may have been the valve's temperature setting is out range when you installing the temperature control knob.
Posted on Jul 05, 2010
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