Emergency; Please Help! Harman 52i

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But a UPS will keep the stove going if it's just a 3 min blip.

Maybe the board just had to be turned off to reset itself. I had a problem when trying a car battery AC/DC adapter. Stove went nuts, flashing and all. When the power came back on, it took a few un-plug from wall to get it going right. Been fine for some 8 years after that.