Indeed. As I said,we've always had more than one (currently four, albeit one is often empty and switched off) - so a good few over the decades, and I think only about four or five of them have truly 'failed' - but, yes, a couple were as you describe, still 'running' (continuously, except when compressor over-heating caused a temporary 'shut down'), but without cooling adequately - but both those events were detected by my 'over-temp' alarms, which are trigged by a rise in temp of about 3-4 degrees above what it should be.
Kind Regards, John
