CE probably means a Communication Error between the high and low voltage boards of the freezer. First, check if your freezer uses a 9V backup battery and replace that with a new one. Next check the wiring for corrosion or damage. Check where the wires connect to the boards and inside the door. (Note: the high voltage board controls the compressor.) You may want to check that the freezer is holding the correct temperature with a refrigerator/freezer thermometer.