Use for 11 months, not heat any more

I bought this last year, use it all good. But last month, it does not working any more. The light is flashing all the time and it does not heat water. I push the boiling button, it stopped flashing, but is still not heating. After 2 mins, it is flashing again. I figure it out it is still under warranty, hope the seller help me take care of it.

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