问题可大可小。不制冷说明compressor不工作

或者基本不工作。往大处说是压缩机坏了，需要换整个condenser. 但可能性不大。最有可能是bad capacitor, contactor,or as simple as pushing reset button. If it is the last one, you need to find what tripped the reset button. It could be a bad/weak fan motor,dirty condenser coil, or low charge which cause the compressor overheat. You need to fix the problem. Otherwise, it will happen again when the AC is needed the most.