Dspark,
There has been a sort of survey conducted recently that reports a very large percentage of non-working GFCIs are in the field. It is suggested that many are damaged by exposure to weather and power surges. This may be one that falls into that category.
I once came across a pool light (120v) with a broken lens (water in the fixture) that did not trip a properly wired GFCI receptacle. The GFCI cover was damaged or missing and I think that the contacts must've been rusted in place.
Bill
