Glow worm Space Saver 38 Fault?

Hi, i recently removed a radiator to decorate behind it. I turned off the two end 'taps' on the radiator, then took the radiator off (lots of black water came out etc etc) then later i connected it up again, turned the taps back on, bled the air, however ever since neither the hot water or heating works - the pilot light is on, but it fails to 'kick in' when either the water on heating swtich is on. the boiler has no pressure guage, and i can't see any place to 'top up' the water. the radiator does not fill, and is currently empty - i'm not fussed without heating for a while - but how has this affected the boilers ability to heat water? ideas would be appreciated. many thanks.