Boiler not firing up. Help please im cold !?

Help, I have a Glowworm SpaceSaver 52, The boiler apart from hot water has been mostly off during the summer, it started to get some use this week and but very noisy but working fine along with the pump, checking the rads I found that there was a rad totally cold some I bled it and the noise reduced. Unfortnualty the boilder has not stopped working correctly, Pilot is fine, but when I turn on the hot water or Heating the system fires up but then turns of after about 30-60 secs. The boiler itself get hot but none of the in-out pipes get warm. The pump making a slight wirling nosie but not a noisy as it has been before.

Cheers