Radiator replacement

[tshanty42]

Can anyone please help. I replaced a radiator today on a sealed combi boiler. Turned the boiler off, drained the system, replaced the radiator and refilled the system via the filling loop. My problem is that the pressure was 1 bar when i stopped filling but increased to 2 - 2.5 bar. The boiler will not ignite at all on central heating demand but will ignite when hot water from taps is called for. I have bled all radiators but to no ovale. Can anyone give me an idea of why the boiler is gauged at higher than needed pressure and why the boiler will not ignite on CH demand?

Please Please Help!!!!!!!!!!!

 

[Gasguru]

Boiler make/model etc etc

 

[tshanty42]

Hi the boiler is a Ferroli F24.

 

[bengasman]

Filling loop letting by, remove braided hose when finished filling.