Despite my finding this discussion late, I see we haven't passed another Sunday yet. My two cents has to do with the overload switch. That switch should operate if you stall the compressor. Note that things may have changed since 1970 :) We had a number of window units back then. If you stopped and restarted them without waiting, they would draw lots of current until the overload switch opened. Then there'd be a half-minute wait or so before it tried again. Modern thermostats, for sure, use their little 8-bit brains to prevent this kind of abuse, so to do the test, you may have to operate some switches manually (meaning, clip-leads). Then, you can find out: Does the overload switch work? How long does it take to reset? This is also a good way to heat the compressor up. At worst, you might push the poor thing over the edge and break it completely. Then, it's warranty work >:-) --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .