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That is usually a problem with the automatic transfer switch OR the power source. Check that first and be sure that there IS good power OUT of the receptacle. IF so, then testing the transfer switch would be the next thing. IF you aren't getting good power INTO that and the source is good, then the plug or cord is suspect.
IF this has a cord reel that is a suspect as well...........
Just checking back in to see if you were able to resolve this issue or do you still need some additional input from me here?