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Hi ddicky the polarity is correct. Already checked that.
Sent from my SM-G955U using Tapatalk
It sounds like the polarity isn't correct, ddicky maybe right... have you tried swapping the wires, never mind the colour code or just gone by wire colours?
If the wires are swapped, you'll have positive feedback instead of negative so it won't stabilise, and the TC input will be getting an inverted voltage, which it may not be expecting nor capable of coping with.
Try reversing the TC wires and repeat your ice-water test?
Dave H. (the other one)