If your refrigerator is cooling very poorly you may need to replace the defrost timerBy
If you find that your refrigerator is cooling poorly it maybe because the defrost timer has failed and needs to be replaced.
As I found was the case today with a Frigidaire FRT18IL6DS refrigerator I was called out to repair.
When I looked inside the freezer and noticed all the frost build up I was sure the refrigerator had a probably with it’s defrost system.
I tested the defrost thermostat and defrost heater for continuity with my multimeter. Both the defrost thermostat and the defrost heater tested ok so I went ahead and replace the deforest timer, part # 215846602