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the F9-5 is a lower door lock/latch error, first Check for obstruction in door lock mechanism, if you don't find any obstruction replace the door latch. there is a short in the micro switch from what your saying. heres a link to order the part. http://www.repairclinic.com/PartDetail/Door-Lock-Motor-and-Switch-Assembly/74005495/791974?modelNumber=MER6772BAW hope this helps, thanks , Bryan
what about the f1-6 code?