Compressor abruptly stopped and doesn’t start. When again pressed the start button, display shows Temp Sensor 2. But there is no temp sensor 2 in this model. IR contact told to change the controller. After changing controller, the display is Temp Sensor 1, Low Sump Pressure, Temp Sensor 2. We have checked earthing, checked for any leakage and all valves. What may be the cause behind the fault?