GeoSmith
New Member
I just replaced my Mixet shower valve stem which became hard to adjust with an aftermarket product and it was lukewarm afterwards. I reinstalled the old stem and the temperature was fine. I took everything apart and noticed that the stem pieces were very loose but it took me a long time to figure out how to fix it since there are left and right threaded units that need to be tightened in the correct order.
Now that I did that I think you might be able to fix the temperature bypass problem on a replacement stem without taking anything apart. Try turning the water on and then turning the temperature control knob counter clockwise several times to tighten the pieces which are reverse threaded. The water on/off knob which moves the gasket away from the valve seat is right threaded but the temp. control is left threaded and may come loose when new. The temperature knob may turn but the valve control may not.
Of course I may have everything reversed but I'm sure people will let me know when it doesn't work!
Now that I did that I think you might be able to fix the temperature bypass problem on a replacement stem without taking anything apart. Try turning the water on and then turning the temperature control knob counter clockwise several times to tighten the pieces which are reverse threaded. The water on/off knob which moves the gasket away from the valve seat is right threaded but the temp. control is left threaded and may come loose when new. The temperature knob may turn but the valve control may not.
Of course I may have everything reversed but I'm sure people will let me know when it doesn't work!