Hello. This is quite common here. The culprit in this situation will be the key pad. This pad is basically a printed board that allow interactions with the programed control board. The necessary actions are to replace the key pad membrane circuit board. This is housed in the control sector of your unit. It is relatively easy to replace, if you have some general knowledge of circuitry panel dismantling.
The part number for the affected key pad will be 3506W1A772B. Click Here to view an exploded diagram of your microwaves control sector. The key pad will be labeled number 2000 on the diagram provided. The control panel will be labeled 2002
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