I recently purchased a box of three Leviton GFCI receptacles with the SmartLock feature. When I wired one of them into a two-wire circuit ( no ground) there was no power from the GFCI. I checked it with both a lamp and a voltmeter. It would trip when pressing the Test button (the Reset button would pop out) and then would reset when pressing the Reset button (button stays in). But still no power from the GFCI plugs. I thought maybe the neutral and hot wires were somehow switched, so I checked the black wire with a voltmeter using a neutral from another circuit. It read 120.1 volts. I then checked for voltage on the neutral and got 0. Reading volts across the white and black connected to the GFCI shows 120.1 volts. I thought that maybe the GFCI was faulty so I pulled another from the box and got the same thing. The third one did the same also. I then put the original receptacle back in and it works fine as well as all of the downstream receptacles.
I put one of the GFCI's in a separate circuit as a test. The result was the same as above. I then tried wiring in the downstream receptacles to the Load side of the GFCI and none of them had power either. I'm trying not the think that an entire box of 3 GFCI's are faulty but I'm a little baffled by what I'm seeing or what kind of circuit problem would cause this.
Does anyone have an idea as to what might cause this kind of thing?