The new ADC is much more reliable. I can remember only replacing one of the new style controls and countless of the old style. What I do is plug in my steamer. While it's heating up, gain access to the ADC. If it's the older style with no cover, short the L1 and test pins with a screwdriver. If it doesn't shut down and go into defrost, you know the ADC is bad. What usually happens is the relay will chatter. By the time I've replaced the ADC, my steamer is heated and ready for defrosting.