Grohe 47 111 thermostat valve/thermoelement cartridge doesn't let cold water through

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ovidiu

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I have an Integrated Grohmix 34-436, which served us well for the past 10 years:

However few weeks ago, the thermostat valve started misbehaving, not letting enough hot water through. So I bought a replacement and installed it.

To test whether it works or not, I put the lever in the open position and turn on the cold and hot water service stops. Unfortunately only hot water comes out, the cold water is not let through. I tried turning the knob on the thermostat valve to no avail, only the hot water keeps coming out, no matter which position the knob is in.

When I put back in the old thermostat valve, the water is mixed correctly, just not as hot as it should.

Is there a calibration procedure that needs to be done on the valve itself? Besides the front knob, there isn't anything else that could be adjusted.

Is there a correct way to insert the cartridge? There is a longitudinal cut on the cartridge, does it need to be in a certain position when I push it in and before I start to screw it in?

Any thoughts on what could be the problem? At this point I'm thinking the replacement thermostat valve is bad.
 
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Jadnashua

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I've only needed to call them once, but the tech line at Grohe was both helpful and accurate...I'd go to the source.
 
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