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My Clearomizer seems faulty and I have checked the central pipe

So, you have checked the central pipe for a blockage and there doesn't appear to be one.

This could mean there is a connection issue between the clearomizer and the battery. Sometimes simply by wiping down the threads of the screws on both battery and clearomizer with a damp piece of cloth. This can remove anything stopping the two from connecting, especially if some e-juice has got onto the battery, dried up and caused an invisible film to form.