Temperature valve dial stuck
The black deposit is just carbon from the motor and pump assembly and is normal.
At two years old my first thought would have been the filters but as you have checked them it sounds like the thermostatic mixing valve but..... these are usually fairly reliable and I can’t think of one needing replaced at two years but.... you say it is stiff so there again 0it is pointing to that as the fault, the link to a new valve is below.
http://www.showerdoc.com/triton-temperature-valve-thermostatic-83305270
However the cost of a new unit isn’t that much more!
http://www.showerdoc.com/triton-as2000xt-thermostatic-power-shower-tas2000xthm
Answered 9 years ago by Anonymous
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Triton As2000xt Thermostatic Power Shower White/Chrome - Tas2000xthm
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