Umc5200bas06 clock is showing time. Suddenly the panel is running a statement "press start"

Sounds like your losing power, have you tried it on a completely Different circuit??? Either that or bad fuse or connections inside of microwave.

Press Clear (or Cancel). Press the CLOCK key (or the key that shows a picture or icon of a clock). Type in the time and press Enter/Start.

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1. • 1 Press the "Clock Set/Start" or "Clock" button on the control panel.
     
   • 2 Enter the time of day using the number pad, or use the "+" and "-" buttons to scroll to the correct time.
     
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   • 3 Press the "Clock Set/Start" or "Clock" button once again to save the time.
     

Operating functions:
To set the clock, press and hold the clock/timer button for three seconds. A clock icon will appear on the left side of the screen. Input the time using the numerical buttons and then click the clock/timer button to save the time.
To set the timer, press and release the clock/timer button so that the display shows all zeroes. Enter the desired time using the keypad. Press start/stop to start the countdown. The countdown may be paused by pressing the stop/start button and resumed by pressing the same button again.
When countdown is complete, timer will beep continuously for thirty seconds and display will flash. Timer will then beep every ten seconds for ten minutes until the stop/start button is pressed.
This timer will also time up to time activities. To start count up, press clear/memory so timer reads all zeroes. Press stop/start and a plus sign will appear on the right side of the screen as the timer begins counting up.

My Panasonic Inverter S333 just suddenly stopped working April 30 after I used it for only two years, no showing in panel. It will run only when I open the door, it is strange.

press clear, press clock, enter time, press clock again.

Press "Clock", type in the time on the keypad and then press "Start". The clock runs a little slow (at least on mine) and I have to reset it about once a month. It gets about 10 - 15 minutes behind after awhile.

In most cases, you press Clock, enter the numbers for the time, then press Clock again, or possibly press Start.

Sometimes you have to press Clock, Clear numbers, then Clock or Start.

Or Clear, Clock, numbers, then Clock or Start.

In some older models, they had a very small mechanical clock button located at the top right corner of the controller near the display window. If yours has that, press it, then the numbers, then that button again or Start.

If this doesn't do it for you, could you post a clear photo of your control panel?

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Sounds like the power inverter