This won't happen down here, but up north, neighbor had water leaking around light fixture. I went up in the attic where our HVACs were located and found the return duct tube about 5' away was extremely low over that spot at the ceiling where the light was. Quickly realized the insulation was wet. The low spot sloshed with water. Went back to air handler and looked below A frame. The plenum where the returns all go to was filled with about 12" of crystal clear water and slowly overflowing down the lowest return duct tube. Took hose and blew out condensate line, sucked out water, and it seemed to stay dry according to neighbor. Probably 5 gallons collected in there. Of course had it just overflowed the pan, they would have quickly realized it.
Yours has to be an inside handler issue. IMO
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