That is definately what you should do first. Thermisters do occasionally fail, but not often. When they do fail it almost always causes the refrigerator to go into constant cool mode and the result is too low temperatures, not too warm.I'll disconnect from the board and check that out.
Should be.Is snip the tip as easy as it looks?
It doesn't matter. A thermister is just a resistor that changes value based on the temperature.I don't think polarity matters.