Pen is paired with ipad but does not work

The transducer element (that sits immediately under the replaceable tip) may have suffered damage from an impact to a hard surface - in particular if the Pencil was dropped onto its tip.

If you have replaced the Pencil tip, having checked that the metal transducer element is intact and not visibly damaged or distorted, ensure that the replacement is screwed snugly into position; you should see a tiny gap, of about the thickness of a sheet of paper, between the tip and pencil body.

If replacing the pencil tip does not resolve this issue, or the tip is not correctly positioned in relation to the pencil body when fitted, then your Pencil is likely to have suffered irreparable damage.

While the standard AppleCare limited warranty does not cover accidental damage, if you have purchased the optional AppleCare+ cover for iPad at the same time as purchasing your ApplePencil, AppleCare+ coverage extends to providing cover for your Pencil - including accidental damage.

Have you recently replaced the Pencil tip - or dropped the Pencil at any time?