my vokera 20/80 has no dhw?
 
                My vokera 20/80 has developed a dhw problem. The central heating works fine, however, when I open a hot tap, I get a very small trickle of water which eventually does become warm. The pressure and thermostat in the boiler are both still functioning normally. Any suggestions
            
             Nicky Rintoul
            
 January 2010