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Hmm, I'm not sure what that switch would be. Possibly the switch which should be mounted to the back of the washer to tell you when the back panel is installed? You can tap the switch shut and if that corrects the issue then that is definitely the back panel switch which should be mounted to the back and triggered when you installed the back sheet metal panel so the washer knows the back panel is installed.
Sorry, if the switch looks like the part in the link below, it actually mounts at the FRONT of the washer to tell you when the kick panel is installed on this particular model.
CLICK HERE to see switch
And the error 1-2 means that your motor control board has an internal short.