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1) Whenever using a plug-in cube type of tester and it shows a hot to neutral reversal, the problem is actually an open neutral which is due to a loose neutral connection or a faulty neutral splice.
2) I recommend to turn the circuit breaker
to the OFF position and back the receptacle out from the wall box, but do not disconnect any wires. Perform a visual inspection on the receptacle and/or wire nut splices inside the box. If any of the wires are inserted into the receptacle "back-stab" hole inserts, these are often prone to fail and come loose. The industry recommended method is to terminate all conductors at the device side screw terminals and never using the "back-stab" inserts.
The hot wire, typically a black wire needs to terminate to the brass screws and the white neutral wire needs to terminate to the silver screws on the receptacle.
3) If the loose neutral is not located in the wall receptacle box, the problem may very well be located in the next upstream box.
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