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per my call with LG customer service when trying to register my microwave, the serial number is the number shown under the QR code on the LG Thin label next to the label with the model number information.
Sorry, there was a problem. Please try again later.Hi there. Thank you for your question. You may look for the symbol S/N which means Serial Number. 12 characters in length consisting of both alpha and numerical characters. It starts with 3 letters followed by series of letters, then numbers at the end. Here is an example of the serial number 204RMMD8U378. For additional information on how to find the model and serial number, here is a link: https://www.lg.com/us/support/help-library/find-my-lg-model-and-serial-number--20152254906058 ^Jolly
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