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The new valves work but not well in the old housing. The same problem occurs as the water temperature is either way too hot or way too cold with even a minute change in the temp control. It's hard to speak with someone at Grohe who knows what is going on with this design change. All the reps...

I am performing maintenance on our aging Grohmix thermostat mixers part # 34 493 (we have two) due to wild swings in the water temperature when making small temp adjustments using the handle while showering. I cleaned the removed check valves (non-return valves part #14116) and found that the...