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i have a vaillant turbomax 24 the temperature keeps going up and down?

my vaillant turbomax 24 will not stay at a constant temp on the hot water ie on max it will go from 74 to 82 and the water doesnt feel as hot as it was when new
colin pritchard, October 2007
sounds like diverter valve is poorly. can only be fixed with a new 1.

paul martin, October 2007
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