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Vaillant turbomax combi hot water problem?

just had a new diverter valve fitted as we were getting no hot water. (central heating fine) problem still exists water now only luke warm any answers?
Chris Dunn, October 2007
or gas meter reg

mrgas, October 2007
either return ntc sensor failed, pipework in boiler blocked causing rapid temp rise or auto bypass on boiler blocked causing div valve to jam in htg position. dpmartin17@aol.com

paul martin, October 2007
link Click here to see other fixes for Vaillant turbomax.