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Thank you for your inquiry. If the building surge light is on it means that the surge protector detects a site wiring fault in the outlet. You can check out the knowledge base article below for more information on the error message. I would try swapping the unit into another outlet to see if the issue persists. If you still continue to have issues please do not hesitate to reach out to an APCbySchneider support team. We offer email and chat services through our support site and you may also contact us directly at 800-800-4272 option 4. http://www.apc.com/us/en/faqs/FA158817/
Sorry, there was a problem. Please try again later.You mean the "Building Wiring Fault" light? Either your outlet is wired backwards (reverse polarity) or you have no ground.
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