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The thermostatic stop is set too low.
Havent set a grohe before but most other thermostatic shower valves work similar.
pull off the handle(however a grohe handle comes off . . ) there should be a notched ring or stop which keeps the handle from going all the way hot. pull out the ring and turn it a few teeth hotter put back and reinstall handle try water temp and adjust again if necessary.
i'm quite sure you shower valve has an adjustment on handle that allows more hot water into the mix,........it will tell you how in the paper work that came with the valve,....good luck, cracklin joe
there should be a flat head screw on the mixing valve turn the water on and turn it to the desired temp,, it is letting to much cold water in , if this does not work replace the mising valve
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