We have a "Bristan Pisa" shower mixer which has suddenly decided to output water at a much higher temperature than usual - uncomfortably so.
The unit was fitted at the time of building the house, and I've never seen a manual or any documentation for it.
Does anyone know if this unit has some sort of internal adjustment for the range of output temperatures? I'm wondering if something could have slipped inside the control knobs which would mess up this setting.
Alternatively, can anyone think of anything else that might have an effect? My understanding was that this unit is thermostatically-controlled, so even if the hot water input temperature increased for some reason (seems unlikely), the output temperature would remain constant.