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There's a mesh filter washer in the two water feeds to the bar valve. Maybe the hot one is becoming blocked and not flowing enough water.
Shut off the supply and undo the two nuts securing the bar onto the wall. Replace washers and refit bar.
The washers will probably fall apart when removing, so don't be tempted to have a look without spares on hand. -
Hopefully it’s that, but I reckon more likely the cartridge has failed. It’s an easy DIY job with a spanner in one hand and YouTube in the other. £50-80 for the part by the looks of it.
user69121
Hefty
@cjr
My Mira Atomic mixer shower doesn’t get to as high a max temperature as it used to. I’ve followed the instructions to set a higher max temp but appears to be no change.
I can get much hotter water from the hot kitchen tap. The shower does adjust cold to hot, just not hot enough.
The expansion vessel on the boiler has been re-pressurised recently and the HW temp is almost at max on the boiler.
Any clues or suggestions what’s going on?