Central heating problem

[Kelvin]

I just drained my central heating system to install a new radiator. When I refilled it, bled all the air out and turned the heating back on, the boiler only stayed lit for a few minutes than cut out before the radiators were hot. The pipes around the pump in the airing cupboard are scorching but the radiators are cold. Any suggestions?

[buildersmate]

You've got an airlock somewhere. Possibly around the main pump area - could be it is just spinning air around.
The boiler went off because the water in the heat exchange was hot enough.

[Kelvin]

Cheers Buildersmate,
Turning on rads one at a time and further bleeding, along with turning the pump up a notch sorted the problem.