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how do i replace the diverter valve in my boiler?

I have a vaillant TurboMax plus and started having trouble getting hot water. I can not get hot water when the CH is on. Is this the diverter valve or the heat exchange plate? and how do i fix it?
JK, September 2008
Well if you've never given it a go I'd advise you to get a professional my friend. :)
If, in hot water only mode, you're boiler does not light up then generaly the issue lies with the diaphragm and not neccesseraly the whole diverter valve. You can purchase a diaphragm or even a 'service kit' which will save you loads!! However you need to know what you are doing! :(

Diamond Gas, September 2008
link Click here to see other fixes for Vaillant.