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"Locked" on the display is an indication that your microwave oven has a Safety Lock feature that allows you to lock the keyboard. It can inadvertently be set as a result of the consumer pressing and holding the wrong buttons and during power interruptions. You need to refer to the owner's manual under the Operator Controls section to see which buttons you need to press and hold to turn the feature on/off. If you no longer have an owner's manual, please post back with your MODEL NUMBER, so that I can provide you with a more conclusive solution. To answer your initial question, the oven SHOULD still be operational, but it needs to be unlocked in order to fully determine this. I hope this helps you.
NOTE: On many microwave oven models simply pressing and holding the CANCEL/OFF button for 3 to 5 seconds will turn the lock on/off. If not...please let me know.
The two possible causes are a faulty door switch and a bad magnatron. You can pull the top cover off of the unit and check all of the door switches (there are 2-6 of them all on a common rail, me normally closed)). If the door switches all check out, replace the magnatron, diodes, and capacitor
My microwave has a child lock on it.To set it all I need to do is press the start button for 4-5 second to lock and unlock. It may be something triggered it. It might be a quick fix until you find out what is causing it.
If this has a controller that runs a microwave and an oven, then the problem F2 means a temperature related fault such as a bad temp sensor / thermostat or a defect in the control board.
If it's just a microwave, then the problem is likely a failing keypad. In many cases, those can be replaced economically.
If you repost with your exact model number (62622 is not a complete model number) then we can advise you further and more specifically.