Hi and Welcome to Just Answer,
Ok, let's take a look at this;
F-1 code means a failure in your device it could be a few things causing the problem. The magnetron could be going bad, the control board might be getting wore out,
It could be the switch to the door, not completely closing.
The manual states to contact a Service center, there is a one year warranty on this device
If you need more help Let me know
If you find this post helpful please take a few minutes to leave Feedback.
By you leaving Positive Feedback you give your Expert additional opportunities to earn extra CASH and Recognition.
If you would like to give a Bonus they are always welcome.
If there is anything else let me know, If not click accept. Thank You Michael L.