S by s has frost build up
You will have to check the continuity of the defrost system. You can check this by unplugging refrigerator, and testing the circuit from the main control board behind the refrigerator. If the circuit is not compromised, the problem is likely with the control board itself. If the circuit is not intact, you will have to open up the freezer and test all the individual defrost components. There are thermostats and thermistors that need to be tested in cold conditions, in other words, you will have to test them while there is frost on the evaporator. You can however test the defrost heater with or without frost on the evaporator.
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