In my new house (well, it's an old house, 58 years old) when I plug my Uninterruptible Power Supply into the mains so it can feed power to my computer and all the peripherals, the little red light on the front lights up, "Building Wiring Fault".

What does this mean? Everything appears to work normally. Is it dangerous? Is it something that I need to attend to? Am I risking damaging my equipment?

My electrical knowledge is pretty limited. I'm a wizard when it comes to flipping a light switch, but that's about as far as it goes.

tanstaafl.