2.Check wire connections in harness leading from machine control board to door lock mechanism.
3.Check door monitor switch for welded contacts.
4.Check inputs and outputs at machine control board.
This machine has two locks one either side so you will need to check out both door locks, check the wire harness out with a ohm meter and check the wire terminals where the wires hook up to the control board. once you determine with a ohm meter which lock has failed or if the wire harness or control board has failed the part will need to be replaced.
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Not sure door had locks ?
Don't have ability to understand this. Not mechanicallym oriented. probably need a service call??