I don't necessarily conclude that the transfer switch has failed. It could have transferred OK but the inverting circuitry simply isn't inverting. It is a totally different function than pass-thru or charging, so could be failing while the others still work. I'll grant, though, that a "buzz" sounds more mechanical than electronic, so the switch failure is a possibility.
Xantrex doesn't provide support or parts for the old Trace products, which they class as "discontinued". You may be out of luck.
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Gary Brinck
Former owner of 2004 American Tradition and several other RVs
Home is West Palm Beach, FL
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