I have a 1999 Winnebago Ultimate Freedom with an RVP 6636-871 air conditioner located next to the engine in the rear.
I also have a Freedom 20 Heart Interface inverter/charger supported by all new batteries, good connections, and clean terminals.
Both were working fine thru the last 12 months. However, all of a sudden, after plugging into a 50 amp pedestal that had 123 on both legs, the inverter/charger is not charging and the air conditioner is blowing warm air and the compressor is not coming on.
The only problem I found was my 50amp plug had a couple of disconnected wires which was causing me to have only one live leg in the plug. After fixing the plug and plugging it back in these things stopped working.