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runs cold?

WHY DOES MY TURBO PLUS COMBI RUN HOT,COLD,HOT, COLD THEN FINALLY HOT, WHEN CENTRAL HEATING'S ON PLEASE?

IN SUMMER, WITHOUT HEATING IT'S CONTINUALLY HOT. THANK YOU.
CAROLE RICHARDS, March 2009
THANKS FOR REPLY BUT I STILL HAVE THE SAME PROBLEM - EVEN THOUGH THE DIVERTER'S BEEN CHANGED AND THE BACKPLATE

CAROLE RICHARDS, February 2010
Sounds like the diverter valve is not switching over properly, unusal for a Vaillant. could be muck in it stopping it opening and shutting. Tricky job to do better of calling someone out,
Cheers

Mick, March 2009