Possible pertinent info : A different outlet in the same room, displays a Wiring Fault Indicator on my APC 1500RS UPS Unit. APC says this could be 1.Missing Ground, 2. Reverse Polarity, 3. Overloaded Neutral. I haven't been able to get ahold of a meter yet to check it. I did, try plugging UPS (use it as a tester), into same outlet AC is running from, both with AC plugged in/not and AC running/not, never produced red warning light on back of UPS. The 2 issues may be unrelated, but, just in case, there ya go
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-David