f the door fails to lock after six (6) attempts "Fdl" will display. The "Fdl" error code indicates the door failed to lock or the control does not detect the door being locked. The likely failure is the door lock mechanism. There is always a chance there could be a loose wire connection between the door lock mechanism and the Central Control Unit (CCU) causing the error too.
I added the instructions in the image below on how to remove and replace the door lock mechanism. NOTE: Disconnect the power cord from the power source before removing and replacing the door lock assembly.
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