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There is a transformer that take the 110 voltage and reduces it to 13.8 or 14 volts depending on your unit model, it runs an electronic board or little computer in the coffee maker. It's the brains of the coffee maker. I would say you fried the transformer and possibly the electronic board if the high voltage made it past the transformer. I have replaced the transformer in our sons Keurig and that fixed his problem but he didn't plug it into 220v. The transformer is not expensive, an eBay item at around $15 or so. Taking the unit apart is not an easy thing to do. But if your handy you could figure it out and test the transformer to see it it's putting out the right voltage. Just check the voltage tag of the one that it came with so you can order the right one for your pot.