DISCLAIMER:
This video is only intended for use by qualified Gas Safe Registered engineers. You must not attempt any work on your boiler if you are not qualified. You must always carry out 26.9 checks upon completion of works on a boiler.

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Whenever you change a fan on a Worcester, 3 things you must also have with you in case they need changing as well:
1) Electrodes
2) Bearing plate
3) Gas pipe tube

You won't be able to inspect these until you start taking it apart, and most of the time the electrodes will need changing, the bearing plate on the fan can split and so can the gas pipe tube.