The top door of the chamber is not closed
a. Close the top door, and click “lock” icon in touch screen and see if error can be
resolved.
b. Check LED – DS4 in main board. When door is closed, it is on, it is off reversely.
Refer to Figure 19-1, DS4 is under DS3.
c. If LED – DS4 is off when front door is closed. Replace the sensor.