I have had a creeping death on the temperature on my aqualisa shower, in that it has being getting hotter and hotter each day for the same setting resulting in us progressively turning the temperature down, our normal temp is now below the word "cold", it completely stopped today, all lights on with the shower shutting off water after about 5 seconds. Thanks for the tip on holding the boost button whilst powering on, it took two tries for it to work. But now boost light off and the shower stays on, still over at the cold side. Reading the thread that sounds like a sensor problem in the control knob. Thought I'd post in case someone else has had a similar problem.