Gfic reading reverse hot/neutral when tripping.....

[Kreiss]

Working in a 120/208 pannel, have circuits 25,27,29 feeding 3 different recpticals. 1 is a gfi and it reads correct till I use a plug checker to trip it and it then reads reverse hot/ neutral. I switches the gfi with another working 1 to see if it was defective and it works perfect on existing pannel.

 

[JFletcher]

Welcome to the forum.
I would pull the receptacle and verify the wiring. It's also possible that your plug tester is faulty and or worn out and one of the light bulbs is loose giving an errant reading. They do take a beating in a tool bag so it's possible your plug tester is bad.

 

[414Mhz]

+1 on checking the wiring at the receptacle.
If the GFCI didn't trip with your tester, I'd guess no ground at device.

 

[GoldDigger]

And if the tester showed anything but open on both hot and neutral either the GFCI is not correctly opening both or (more likely) there is phantom or stray voltage coming from the downstream feed through circuit.
One possibility would be an improperly shared neutral (MWBC?) downstream.

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