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vaillant pro 28 no hot water but central heating is ok?

I have a 7 year old vailiant boiler. The central heating is working fine but there is not hot water coming out of the taps only slightly warm.
John, December 2008
Could be one of two things. The sensor that detects your requirement for hot water coupled to or instead low gas pressure when HW demanded. You will need a techi

Troubleshooter, December 2008
link Click here to see other fixes for Vaillant.