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I pulled the tech sheet on it, mer7662 is a good model number. If LOC is showing up, generally speaking
Page 4 of http://www.maytag.com/assets/product/MER7662WS_Use%20and%20Care_EN.pdf
Will indicate the loc display. Do any functions work? It says Only the CLOCK, OVEN LIGHT, and KITCHEN TIMER keypads will function with the controls locked. Do these function? If they don't you might have some type of software problem. In which case I might recommend unplugging for 5 mins and then plugging back in. If not do any buttons work or beep? Thanks!
Glad to hear it. Flipping a breaker, pulling the plug same thing. Most likely you just had a software glitch. Doe it seem to bake and all correctly? If you have any further issues just come back to this post and ask. Also please remember to click accept and leave feedback for me. Thanks again!