Hi
F3 is an error indication that there is a short in the key pad assembly. It is likely that this assembly will need to be replaced.
Be aware that Microwaves carry potentially lethal levels of voltage even when completely unplugged from the mains supply.
For this reason I recommend you get a tech to look at your microwave and you do not attempt any repair to a microwave yourself.
It is likely that the keypad assay will need to be replaced. This part costs usually around $100. You will also have a labour cost also to consider so you should weigh this cost up in economic terms before you decide to proceed.
Hope this helps. Please do rate this answer. Thanks.
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