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how to get hot water?

i have a vaillant boiler the central heating is working but no hot water or flame when you switch to hot water only
yusuf, November 2008
I have a vaillant 828 boiler and the heating and water intermittently does not work on a daily basis. One minute their working then maybe 10 minutes their not. What is the problem. The system guage pressure is also gone past the red zone.

Suz and Paul, November 2012
link Click here to see other fixes for Vaillant.