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"If it has never been right you don't need a new cartridge. You can tweak the cartridge inside which is held on by four screws. You take out the screws and turn the dial inside a 1/4 of a turn more towards the hot. Hard to explain but you can "commission" these showers to get them hotter."...

is that a big job? Someone suggested re commissioning or calibrating the shower - does that sound right or crazy?

"is it a recent problem or has it always been wrong?" Noticed it last winter when I really needed hot showers. In the summer I don't mind so much but yes I guess it's always like that "if you turn the shower down (slower flow, not colder) does it get warmer?" No "You probably...

I had a Gainsborough GS500 mixed shower installed 2 years ago as part of a bathroom refit.  I have a combination boiler and the water is mains fed. The boiler is working perfectly well - I have checked at all the hot water taps and the temperature is fine. However, when I run a shower...