The freezer is working well – perhaps too cold. The compressor is constantly running. The cooling vanes are hardly warm suggesting that it should be turning off. Is this likely to be a pcb problem (the lights all work. Incidentally, what is the amber light for, which is activated by the button?), or a problem with the compressor main relay? On first turn on, the red warning light flashes until temperature is low enough, suggesting that the temperature sensor at least is operational.