Worcester Greenstar 28i junior Boiler.... Please help!?

Got up, washed hair, made brew, went to wash cup an no hot water..., so I went to check boiler. Found V.low water pressure. I re-charged system to 1.5 bar, bled the rads and condenser an' hit reset. Boiler shut down, actuator reset itself, slow fan kicked in, I heared a single click from what sounded like the gas supply (couldn't hear the peizo ticking though). It stayed like this for approx. 30 secs then fan sped up a notch, and both the reset light and the blue boiler light started flashing at approx. 1 per second. It stayed in this state for 30 seconds an then the fan stopped. Went through this a few times (10 ish) then turned the rad temp dial to min to try an reset just in case it was in a lockout mode, left it for half an hour, came back, turned the rad dial up to max. an' tried again but got the same result.....currently joggin on the spot to keep warm so any help (on the boiler, not the joggin) would be really appreciated.