The SE error code means you have a shorting membrane keypad.
you would need to replace either the membrane keypad or the control panel frame assembly, which comes with a new keypad already installed.
unfortunately, those parts for this model seem to be unavailable. So the only option would be if you can find a used or "New Old stock" part on eBay or at a local or online appliance parts store.
If you can find either of these parts, that will fix your microwave:
DE94-01386S ASY CONTROL-PANEL (STL)
DE34-00233N SWITCH MEMBRANE (BLK)
The support page for your microwave is here, where you can find manuals and a helpful exploded view part diagram.
https://shared.whirlpoolcorp.com/product_literature/search_results.jsp?searchTerm=MMV5207BCS&siteCd=WHRCOM&userType=Consumer
Good luck.
Reset problem. Firmware bug in oven.
SOURCE: Hi. I have a Maytag mmv5207bcs Microwave. Pressed...
mmv5207ba/bc microwave 0 button fan on button does not work all other key pad buttons seem to work
Considering the problems you are having it would be cheaper to replace the microwave oven.
Testimonial: "ah yeah, I just liked the old one it was larger then most available now, just can't help taking things apart about 99% of the time, it works and I use of whatever it is for a couple more years"
Hi ssullivan013 - Here are some generics instructions that I found for the model number posted above. Hope the information is helpful.
Suppose you want to enter the correct time of day 12:30 (A.M or P.M.).
1. Touch Clock pad.
2. Enter time 1,2,3,0 and press CLOCK pad again
This is a 12 hour clock. If you attempt to enter an incorrect clock timer, ERROR will appear in the display. Touch the CLEAR/OFF pad and re-enter the time.
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