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I advice you to contact service if it has guarantee. This seems to be a psychological problem about your oven(!). Technical person need to do an electronic research surgery on its board to see if there is any wrong thing.
Press and hold the DELAY START TIME button for +5 secs and a chime will sound. The option to toggle between SND HI and SND LO will come up, pressing Delay Start Time will change it between these options.
Often over the years the Transformer laminations can loosen, from the on/off rising and collapsing magnetic fields, and then they sorta hum louder. I suspect this is what is going on. Shouldn't be too much of a worry.. keep an eye on it tho.
My daughter is having the same problem as you are having. Thing is we bought it for her new. She had not used it at all for a year. They finally bought a house, started using it in May. It is now doing the exact things yours is doing. Is there some kind of recall notice on these microwaves or what is wrong and how do we fix it?
Your magnetron tube is leaking RF energy inside and zapping the main board. It is NOT dangerous as any leakage will be contained inside the unit. You will need a new mag tube and it is covered by a 5 or 10 year parts warranty. Call GE Factory Service at 1-800-432-2737or schedule online at www.geappliances.com
I couldn't find those exact trouble codes, but a common problem is when the controller gets damp, either from steam rising from the cooktop or someone spraying cleaner directly on the keypad.
Cleaners should always be sprayed on a soft cloth, then wipe the keypad with the cloth.
Also, GE / Samsung codes of F1, F2 and F3 may be the same since Samsung makes GE microwaves.
Those would mean trouble with the temperature sensor, keypad, or control panel.
Assuming your control panel is clean and dry, it may be time to call for service.