Lights flashing, alarm sounding - while not in use

takasugi, try to run the diagnostic mode on your washer and see what it tells you.:

DIAGNOSTIC TEST

The control must be in the OFF state before pressing the touch-pad sequence to start the test.

Starting the test mode

Close the door.

Press the Control On button.

Select the DRAIN/SPIN cycle.

Select NO SPIN by pressing the SPIN SELECT button, as needed.

Push Prewash Option button four (4) times within five (5) seconds. C:00 will show in the display.

NOTE: If Model does not have PREWASH Mode as an option, press RINSE/HOLD.

If the Starting procedure fails, push PAUSE/CANCEL button. Then repeat the starting sequence.

Test Program Control during Execution

To advance to the next step of the test procedure, push Prewash Option button two (2) times."

You can try and download the manual from here for more info. Hope this helps, good luck.