Scorching water from Vaillant combo

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14 Sep 2021
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Hi… I have an old Vaillant Ecomax 824/2e that is making some very hot water!

The water temp gauge is set to 50 degrees Celsius (on the lcd display on the boiler - the dial is about half way between coldest and hottest).

However, when I turn on the top tap fully, the reading on the same gauge jumps up to 70-80 degrees… and it is hot!

The flow from cold water tap is about 10l/min
The flow from hot water tap is about 7.5l/min

The water inlet valve to the combo is fully open and the mains water tap is fully open too. I am in a hard water area.

Does anyone know what could be causing the problem and if there is anything I can do?

Thanks a lot!
 
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