Samsung Fridge Sensor
Was having a problem with our fridge, Samsung model RSG257AARS. The freezer was cooling fine but the fridge wasn't cooling properly. The coil was freezing up so about every 2 months, and we had to thaw it out. Did a little online research to narrow down the most likely causes, which led to the defrost cycle not working properly due to a faulty temp sensor. After removal I tested the old sensor and verified it had failed, about 38% out of tolerance. The max deviation from the spec is about 5%. A few pictures of the "test bench". Tested at ambient, and around 32-33 degrees. The sensor is pretty cheap, about $7, it cost more to FedEx it than the sensor is worth. If you have a similar problem with a Samsung check the temp sensor.