Prolonged downtime caused by compressor temperature sensor may be the reason, the control circuit, the relay K1, transistors Q811 damage. First test Q811 base voltage greater than 0.7V stable, normal. And the temperature sensor may malfunction in the control circuit. Try the refrigerator and freezer temperature sensor unplugged interchangeable, compressor resumed on / off. With the same model specifications to replace the freezer temperature sensor to resume normal work after the temperature sensor.uMtservice manual download site