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max of 50 degrees hot water?

I have a Baxi 105 HE combi boiler about 6 years old.
The hot water and central heating water only gets up to 50 degrees. The dials that are supposed to adjust the temp. do not feel as if they are turning beyond half way.
Is this a circuit board fault?
Weaverae, February 2012
is it since new or repaired than or knob is inserted incorrect possition

k, February 2012
link Click here to see other fixes for Baxi 105 HE.