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I had a Generac Guardian 8kw generator installed at my home about 15 months ago. Three weeks ago we experienced a power outage, our first since the unit was installed. The generator failed to provide any backup power. In fact, it did nothing at all. After checking the unit, the person who installed it told me the failure was due to an "over speed" problem. He explained how I could do periodic checks on the generator's status. I had a simple question about his instructions that I posted on Generac's web site. This evening I received a reply from Generac stating that my question had been "rejected". No explanation as to why. So much for the company's customer support.