Had this today and left me scratching my head. Plugged tester in and looked good.
Pushed the test button on receptacle and got this:
Not sure if I have a call out or just a glitch or something else all together… When I used the same tester in another bathroom on the same circuit, downstream of the GFCI, pushed test button on tester, it read “000 volts” “Open Hot”, just a dead circuit. Plugged the tester into the tripped GFCI before resetting and got the Red light, “30 volts, Open Ground Neutral” again. First time I have seen this when testing a GFCI. Ideas? Please and thanks.