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my Vokera Linea 24 Combi Boiler hot water runs hot and cold?

when I turn my hot water tap on it runs hot the after a short while goes cold then start running hot again, any idea what the problem could be
gaffer, May 2010
Classic dirty flue venturi causing air pressure switch to drop out. V common in models of this era that havent been properly serviced.

c, May 2010
link Click here to see other fixes for Vokera.