GE GDWT668V Technical Service Manual

Also see for Cafe CDWT280V: Dimension Guide Service manual

– 39 –Factory Test ModeThe factory test mode initiates automatically upon installation of a new main control board.Factory test mode (approximately 5 minutes total):• All LEDs light (10 seconds).• Close door.• Vent opens, fan activates for 5 seconds, and vent closes (15 seconds).• Detergent rinse module and water inlet valve are energized (45-65 seconds, depending on model).• Main pump is energized (55 seconds).• Turbidity sensor is calibrated and other checks occur (90 seconds).• Drain pump is energized (75 seconds).• When second fill starts, exit test mode by pressing the START/RESET button.In some cases, it may be necessary to unplug the unit to exit the test mode. If the unit is left in factory testmode, the dishwasher could run as long as 75 minutes before exiting.Turbidity Sensor Replacement/Calibration:When the main control board is replaced, the dishwasher starts a factory test mode when powered on.During this test, the turbidity sensor is calibrated. If the turbidity sensor is replaced without replacing thecontrol board, the sensor may be calibrated manually by pressing the START/RESET button 100 times.If the turbidity sensor fails, the control board uses the maximum wash/rinse cycles.

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