just had the same problem. You either need to use the key provided and follow the instructions that came with the boiler, think you need to place it in the boiler and turn it, then turn a white nob. If its like mine you will need to connect a silver laced pipe to the boiler pipework and turn a plastic tap!!. If this hasent helped give worcester on there customer technical line. There really helpful and if your boiler is still under garentee your laughing they came out and sorted my pressure connection for free!!! tested the whole system very professional now works better than it did when it was installed :-)
steve
September 2007
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