First, does the heating work?
If yes then it's probably the diverter valve or the electrical switch at the end of the valve not working - here you will need a "gas safe" [was Corgi] plumber
If heating NOT working then check the water pressure gauge. Should be between 1 & 2 bar
Operate the fill tap to the boiler until the pressure is right
Further problem - email back
crumple
August 2010