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I Have a glow worm flexicom boiler and i beleive there is an air lock in the system every time i drain offf the system and refill it it does not purge the air out of the sytem? i have tried turning all the radiators off, filling the system and opening whilst bleeding one rad at a time no joy the...

You can not use and open rad anymore and you should not need to an upto date combination boiler in large would have a bypass fitted :D