Hi and Welcome to Just Answer, Ok, let's take a look at this;
That is a error code for a bad keypad, unfortunately I can't find a part for you, so I think it will be cheaper to replace the microwave
If you need more help Let me know
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If there is anything else let me know, If not click accept. Thank You Michael L.
did you get me question
I got the first one on the keypad problem that you accepted, did you need more help
I will post the answer again from above
F3 error code means the keypad failed.
There is no replacement part.
So in my opionion it would be best to replace the microwave then to have it repaired.