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Apologies for all of the posts, but I finally determined the problem, which was detailed above and is due to my lack of understanding. When set to 100° at handle center detent position, the valve can provide the full 40° range. However, if set to 110° at handle center detent position, the valve...

Further adventures.... I figured out that the U-shaped stainless keeper clip that holds the black plastic ring which serves as the detent, need to be inserted for the inner temp regulating device to function properly. Now I am getting a range of temperature, but only around 20° between full hot...

Hi Breplum, I will check for cross flow as you have advised. No tankless heaters or Kohler valves in this residence.

Hi TJRAD, when I try to calibrate by moving the splined plastic cylinder (mine is black) and there is no effect. Hot water comes out of the spout at tank temperature. Since my original post, I have flushed to cold and hot sides, and the thermal cartridge receiver part of the valve, and have...

Hi there, I just asked this exact question, and could definitely use some assistance!

Greetings! First post for me here. After 17 years a client's Grohe 34-126 shower mixing valve started only delivering water between hot and warm temperatures. I am a general contractor with plumbing experience, from rough and finish install to servicing installed fixtures. I ordered a new...