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hot water comes ok but then cold water?

i had vaillant for some time but recently hot water come on and then after sometimes cold water start coming
joe, August 2011
what make sine 18 824 831 etc hot water heat exchanger
need look into replace it

lal, August 2011
A model would help!
My powers of psychic readings is on the wane of late!

Carefree, August 2011
link Click here to see other fixes for Vaillant.