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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
ok, but if you now start it Matt, do you still get the error?
Defective Encoder Strip or Sensor.
You can try to clean the strip yourself, this film shows how (slightly different on your model but same strip)
Else you would need to return the printer to have the sensor replaced.