evo he c22 24 Error L9

6 Feb 2015
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United Kingdom
We have an EVO HE combi boiler HE 24/24, running our ch and hw.
On Wednesday i turn the centre heating on notice that some of my radiators were not heating up, so i throught the radiators were airlock, so i bleed them, an when i turn on the boiler it started make a banging sound as it try to fill up with water, waited few moments heard the fan kick in and then i got error code L9, i had look at the fault codes listed in the Manual its telling me i have to replace few things, but before i go down this root could it be that the boiler is just airlocked?
any help would be great thanks
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