Control knob stiff to turn
The reason for this issue is caused by a build-up of limescale and the result is it makes it hard for the control knob to not only turn, but you may also find that button you press to move the temperature past 38 degrees also becomes stuck. You would need to have the control knob removed, which if is limescale is not the easiest job as it can become fused to the thermostatic cartridge, so quite a bit of force will be required.
Replacement control knobs can be purchased from our Outlet store:
https://www.insigniashowers.com/catalogsearch/result/?q=knob
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