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My son has a worcester 28i junior boiler and the pressure gauge is showing 4.something, all the way round to the stop pin. Does anyone know how i relieve this pressure. Thank you.

After having some bursts repaired the plumber was not able to refill the boiler as the key had been lost. I have now bought a new key, filled the system, bled the radiators, they all heat up, but the boiler pressure gauge is showing no pressure. Could there be an air-lock somewhere? What do i...