Hi, i've samsung MW7490w Microwave. recently it started behaving weired. Whenever I open the door, it starts on, the turntable continuously rotates. Could you please help me.
It's probably a defective door switch, probably the upper one, or the mount which holds the switch is broken. Opening the door while cooking (without first hitting the STOP button) is the primary cause of door switch failure. There are plastic mounts inside the microwave which hold the door switches and onto which the door hooks latch when you close the door. The screws on these mounts may be loose. If they get too loose, the switches will not be activated properly. Usually it's not a loose screw, but instead a broken tab on the switch holder, allowing the switch to rotate just out of position.
Door switches
If one of the door interlock switches
is not switching properly or there is a condensation problem on the
sensor control panel, either can cause the turntable/light/oven to
come on even though the "Starts" button has not been
depressed due to the wiring of the switches.
Check for faulty door
switches and/or contaminated actuators.
I hope that helps.
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