220V Air Conditioner Mystery
About 12 years ago, we had two identical 220V wall air conditioners placed directly above one another, one on the 1st floor and one on the 2nd floor.
I tried to use the air conditioner on the 1st floor for the first time this season last night, and it didn't work.
I got out my multimeter, and tested the output. I got 70V AC out of the outlet. Just for good measure, I tested the outlet on the 2nd floor, and got 240V AC.
Thinking it might be the outlet, I bought a new receptacle, removed the old one, sandpapered the ends of the wires (they looked a bit dirty), and replaced it with a new one. Unfortunately, I'm still getting 70V.
The fact that the 2nd floor works fine leads me to believe that the breaker is not faulty.
The wiring was done through conduit running outside. There is an outdoor junction box outside the 1st floor outlet, presumably where they pigtailed wires together, one set to enter the 1st floor and one set to go up to 2nd. It's about 10 ft off the ground, so I can reach it with a ladder, but being that I have a fear of ladders, and it's right near my cellar steps, I thought I'd fish for opinions before I went up there. Six foot five, and I'm afraid of ladders. Can you believe it?
Thanks for the input.