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Vaillant diverter valve?

Replaced the diverter valve on my vaillant turbo max boiler,because no hot water to taps,this fixed the problem.However 18 months down the line it has happened again.Anyone got any ideas to stop this happening again?
John Parry, May 2007
is the problem the diverter valve or just the hot water diaphragm?

gary.wright53@googlemail.com, June 2007
link Click here to see other fixes for Vaillant.