Plumbing Question!!!!!!!!!? I have replaced a radiator today. I drained the system down (a...

I have replaced a radiator today. I drained the system down (a hermetic system). Took off the ripened radiator and replaced with a unknown one. When i filled the system spinal column up to 1 bar, i turned past its sell-by date the filling loop but the pressure still rose to 2 - 2.5 tablet and the boiler will not ignite. I know that the pressure should be 1 bar when cold but i dont know why it have risen? I have bled adjectives of the radiators but to no avail. The boiler will not ignite at all on the central heating but will ignite on hot marine demand. Can anyone backing on this????
Answers:    Does it have an auto flood valve? If so the spread valve float is stuck usually due to marine minerals, causing the dignified water switch to cut out keeping the burners sour. If manual steep then the dampen valves is not shutting completely rotten letting water to continually riddle and activating the lofty water cut- switchout.
i deliberate you need to reset the boiler system within order to modify to the new radiator try to reset the complete system