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It is normal for the microwave fan in the LG - 30" Smart Built-In Electric Convection Combination Wall Oven with Microwave and Air Fry - Black Stainless Steel, Model # WCEP6423D, to continue to run after it's done. This is by design, and it helps to dissipate heat generated during cooking and ventilate the cooking area by removing odors, smoke, and steam, and to cool the internal components down. In the troubleshooting section of your owner's manual, under 'Parts and Features' on page 65, it lists "Cooling fan continues to run after oven is turned off" in the Problem column, and under "Possible Cause & Solution" it states, "The fan turns off automatically when the electronic components have cooled sufficiently. • This is normal."...^Ivan.
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