How can I fix my Worchester Combi Junior 24i boiler?

Hi

My worchester boiler has stopped working, everytime I turn it on, as soon as I turn on the hot water tap or put the heating on the red light flashes. I have tried to reset by holding the red loight button in for 4 seconds and 10 seconds, nothing works??

If anyone has any suggestions I would appreciate your help.

Thanks

Alan