SunKool was reasonable. There is a power relay called a Connector which turns on the high voltage outside compressor. On some units this relay has open contacts in which insects can contaminate the contacts -- literally the origin of the term bug in electronics, from WWII. Mine had a cover on the contacts but was not screwed on so they got in through the screw holes. Used nylon screws for safety, but had to do myself. Guy said it is a common problem here.
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