@spennie, Welcome to HP Support Community!
If you have already performed the steps from document A 'Paper Jam' Error Displays on the HP Officejet 4215 and 4250 All-in-One Printer Series and the issue persists, it could be a hardware failure.
Please reach out to the HP Support in your region regarding the service options for your printer.
Hope this helps!
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TEJ1602
I am an HP Employee