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It looks like a battery symbol. My only guess would be that the unit contains some form of small battery to retain settings in a power outage. That could possibly be dead?? IDK, just my first thought.
I think those batteries are just cheap so it's always a possibility that they break. It should be pretty easy to fix if its a CMOS battery. It should look something like this :Reply from redsea. Suprising this happened after a week of use