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Can you please remove the power to the printer (so unplug it from the power socket).
Then wait 10 minutes, connect the power again to the printer, turn it on and tell me please if it is now operating correctly.
Let me know the results please
It can be a sensor and thats not worth it
Open up the printer, power it off and wipe it all down with a damp cloth
then wipe it dry with a dry cloth, especially around the door
Does that resolve it?