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hot water on valiant combi does not run very hot?

hot water on valiant combi boiler does not run very hot the combi is a 824 turbomax about 5years old
john, September 2010
Need more information:
Is the HW control working (not broken knob)?
Does the yellow light remain alight while using HW?
Does the CH flow get hot while drawing water?
What temperature is shown in the display while using HW and how fast does the temperature rise?
All relevant to different potential issues.

Carefree, September 2010