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Urgent Need of Electrician, Near Houston??

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It means that there's a problem with the receptacle that the tester was not designed to detect. I've had it happen when a 120-volt receptacle was wired with 240-volts. I've also had it happen when the hot and neutral were reversed, the neutral connection was loose, and there was a load on the circuit downstream.

Bottom line: When you see this, you need to pull out a regular multi-meter to figure out what's actually going on.

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