d.Verify that the motors heat, and door indicator lights on the back side of the microprocessor (computer) board are lit. (Refer to the illustration below.)

e.Open the main door.

The dryer must stop and ALL output indicator lights on the back side of the microprocessor (computer) board must go out. (Refer to illustration above.)

f.Try to restart the dryer with the main door open.

g.The microprocessor (computer) board's L.E.D. (light emitting diode) display must read "DOOR."

h.Close the main door and restart the dryer.

i.Functional check of microprocessor (computer) board is complete.

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American Dryer Corp MDG-75 manual