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Valient combi boiler installed 2005?

I had a totally new heating system installed in 2005 and have had no problems, now for no apparent reason I have no hot water at the taps,the radiators all work fine. Is there anything which I could check before calling the installer.
Alex., November 2008
Check mains water presure is coming in, if no luck there could be diverter or heat exchanger problem,is it being serviced regularily.

A1 BOILERS, November 2008
Need to know what model, might help

a, November 2008