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What does it mean when a gfci outlet tester shows the following light combination;

Bright "open ground" light and a dim/flickering "open neutral" light. I understand the open ground as there is no grounding wire, but I don't understand the dim open neutral.

Thank you

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Outlet testers indicate status by the combination of lights – “Correct” is just a combination of the two yellow/amber lights for “open ground” and “open neutral”. So yours is actually flickering between the “correct” and “open ground” states, meaning there is some sort of ground connection, just a very poor/unreliable one that shouldn’t be used.

This article from the Circuit Detective has an explanation of all the possible combinations of lights on a typical outlet tester, including dim/flickering ones.

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  • Or the flickering could be due a faulty neon lamp in the tester. I suggest checking the tester in a known-good socket. – Andrew Morton Apr 4 '17 at 15:58

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