My georgetown 378 done almost the same thing,I had both set at 89-90 when I use it last I do this in the summer.I did not change last winter ,we had a cold spell,one air came on and would not shut off.The next day the other air came on and would not shut off.I turn my units on and off and they have not this any more.I thought the cold weather had something to do with it.
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