I Have a Britony combi SE boiler I have had to remove and refit a radiator ?

your boiler needs to be topped up via filling loop.usually a braided hose attatched tot two valves under the boiler on pipework.the valves are closed when the slot or handle are accross the pipes.open the valves inline one at a time allow the presure in slowly until your gauge reads just above one bar.

deano
November 2010