It will be detailed in the installation manual for the shower make and model concerned.
Usual is to 'calibrate' the knob to give around 38C at the stop and so you get hotter by pressing in the stop and turning hotter or cooler as desired. The stop is to avoid accidental 'too hot/scalding temperatures' for children and vulnerable adults.
Thanks so if I take of the control knob off for the one that moves the temperature up and down. There maybe a way to adjust it so can move/turn it hotter?
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