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I just plugged a thermistor into the thermocouple, and it reads 605 degrees at room temp. I've checked to make sure it's plugged in with the correct polarity. What else could be the problem?

Newbie here. I could use some help. I just finished my HM 4.3 kit w ras pi3 and thermocouples. When I plug it in, there's a delay of a second or so, all 3 LED, the yellow one blinks for a second (then thorns off). The green and red light stay lit. There is nothing on the display. As far as I...