I have a Kohler whole-house generator. Early on, I had trouble with generator starting for it’s weekly test. After a couple visits by the installer, they sent a senior technician who did a thorough test of the circuit between the generator and the transfer switch. It turned out there was a very subtle loose connection in that line. Bottom line - make sure you have an experienced electrician/service technician look at your problem and make sure the generator successfully completes weekly operational checks and you have the system serviced annually.
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