Product review (5 stars): Simple, inexpensive fix for refrigerator temperature issues that will save you hundreds of dollars
My Kitchenaid (KBFA25ERSS) refrigerator was having temperature issues and this inexpensive part solved the problem.  The freezer temperature on the digital display started reading anywhere from -4 to -12 when the normal temperature should be 0.  The fresh food section continued to read 38 degrees, which is the normal setting. I also noticed that the refrigerator seems to be always running and using lots of electricity. After doing some online research I decided that the freezer compartment Thermistor was the likely cause.  At minimum it was the easiest and least expensive part to try first.  The part arrived in two days (very fast) and after watching one of the many step by step online videos available on how to replace this part I was able to install it in about 15 minutes.  I flipped the breaker back on and tada, my refrigerator was fixed.  I was so pleased at the outcome that I did the happy dance and fist pump in my kitchen in front of my family in celebration of being able to fix this problem for about $15 and avoid a service call that would have been several hundred dollars. If you are having similar temperature issues with your refrigerator I highly recommend you try this fix yourself.  My refrigerator had two Thermistors.  I only needed to change out the one in the freezer compartment, but if you're experiencing temperature problems in the fresh food section (either food freezing or not cold enough) change out the thermistor in this section instead.