I know this seems obvious but when you had the fridge on electric for 12 hours and it didn't work, did you open it to see if it was cool? When we got ours in March and plugged into shore power, turned the fridge on, I was expecting a "running" noise from the fridge back but we got nothing. I chalked it up as broken on electric but the wife said leave it overnight and in the morning, inside was nice and cold. After that, I found out ammonia based make no noise.
Tadd, Beth, Grundgetta and Weeble
Proud to be Air #37137