I have an issue with a 20A circuit with a GFCI plug. The GFCI will not reset, no light appears. I have replaced GFCI, checked line/load to ensure they are correct. The funny thing is, the plug downstream from the GFCI shows it's wired properly (used 3-prong GFCI tester), but when I plug in the appliance (make-up mirror), the tester shows hot-ground reverse, and the GFCI plug upstream now lights up RED. GFCI still will not reset, and has no power. This same circuit is tied to other GFCI plugs downstairs, but they are all functioning properly without issue. I have to think it is just this one GFCI and its downstream partner that is somehow causing this issue. Thoughts?
Well, this is certainly full of red herrings, isn't it?
Sounds like a disconnected neutral wire somewhere
"Hot Ground Reverse" is how a "magic 8-ball tester" tells you the neutral wire is not connected back to the panel, but a load is plugged in and switched on.
So check each of the outlets in the string to see if they actually work. The trouble will be either at the last working one, or the first defective one.
The usual culprit is backstab connections.
Here's what's really going on inside those magic 8-ball testers.
The printed legends, however, are notoriously wrong and misleading. This one has a more useful legend:
Thank you to all who supplied great information. I was able to figure this one out. It was something painfully obvious...the line/load neutral on the GFCI plug were switched. I had initially tested them with a Klein tools non-contact voltage tester and had LABELED the lines. I never questioned it once I had labeled them. Well, I mislabeled the neutrals.
Once I swapped these on the GFCI, everything worked downstream as well. Your time was not wasted. You got me thinking in a different direction, and sometimes that's all it takes. Much appreciated!!!