Heating but no hot water?

I had a condenser boiler fitted in October. For 2 - 3 weeks I have had to bleed the radiators every other day in 1 of my bedrooms as it went cool. It finally stopped working on Thursday and didnt come on at all. Since then I have had no water coming out of the hot water taps either. The heating came back on on Saturday night but as yet still no hot water only cold coming through the cold taps but nothing through the hot. Initially we thought the pipes may be frozen but it doesnt appear to be so as all pipes feel warm and the house is boiling. Any ideas.....