Refrigerator not cooling

What was your original symptom ? Did you have a frosted evaporator ? If you had a frost build up on the evaporator called ( defrost issue ) and your heater and thermostat test good as per instructions above, this tells you to replace the board. Those are the only three components that will cause a defrost issue. If you had another symptom besides frost on the coil let us know and we can move to the next step. Matt Ace technician

HI. AT the bottom of the main board there is a big 3 pin connector. Take this connector off the board. IT will be labeled on the board DEF for defrost and LINE. These are the two wires on the connector you will test at. They are J11 (yellow) and J9 (brown) This will test for continuity through the defrost t-stat and heater. IF there is no continuity then one or both are bad. The defrost thermistor is tested a pins 5 and 4 of the J1 connector. You should have about 36k ohms at 5 degs. Let me know if you need any further help.