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Need some help on hot water issue on Vaillant?

hot water keeps running hot then cold. central heating seem to be working ok.
julie, May 2009
which model Vaillant Boiler is it, please reply with more info Vaillant have been making combis for about 30 years, so lots of diffrent technology and models out there

www.elanar.co.uk, May 2009
link Click here to see other fixes for Vaillant.