The same thing happened to me two weeks ago. The little orange light kept flashing, but I had no warm water and my underfloor heating didn't work either. I did have gas for my stove, however. ???
The only solution was for my co-t to phone a guy. It literally took less than 2 minutes for the guy to enter my place, adjust something in my geyser/boiler and leave. I'm not sure what he did, but I'm sure I could have done it if only someone told me.
I did try to bleed it, but it didn't seem to work (of course I could have been doing it wrong).
Tell your co-t, or ask the maintenance people at your building if you can't figure it out on your own. I had to take cold showers just as a bad cold hit me, not pleasant. :'(
Good luck ;)