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I suspect you had a paper jam and removed it from under the main cover. It sounds like you have got grease on the encoder strip (the long blackish plastic strip that runs the full width of the machine. The carriage looks at the encoder so it knows where it is. Clean the encoder with soapy water on a cotton bud. You may have even snapped the encoder which will mean you will need a new one. Good luck
The iP4300 manual says this for 10 flashes "
The size of paper may not be compatible with automatic duplex printing. The sizes of media suitable for auto duplex printing are A4, Letter, A5, and 5" x 7". Make sure that the size of the paper loaded in the printer is correct. Pressing the RESUME/CANCEL button will eject the paper and restart printing from the front side of the next paper. The reverse side of the ejected sheet will not be printed." Hope this helps