im glad to be at work for a change put new radiators in and now a bloody air lock somwhere. been at it all weekend
Microbore piping? It's pig, you might need to install a vent at the highest point (loft?) and bleed it there. Alternatively use a hose pipe to 'blast' the air lock out
Turn all radiators off Then bleed them all, then turn them on one by one starting with those nearest the boiler with the pump running. If that doesn't work, post an abusive reply to me then call a plumber