First and most obvious, did you tap the “Mode” button and set your thermostats to AC mode? (Assuming they are DuoTherm). When you say both thermostats aren’t working, is that completely or just the cooling function? If completely, i.e. they won’t even turn on, then check the thermostat/satellite/awning/tv boost fuse that on your coach may be in the bathroom breaker box cabinet with the multiplex modules. On my rig it’s behind the 4”X4” black cover that must be pried off, and it’s fuse #8.
If the compressors are gone due to insufficient available voltage, unfortunately you are better off buying entire new AC’s than trying to replace compressors. The problem with new AC’s is the latest models may not play well with your current thermostat arrangement.
Trying to run an AC on 15-20 amps with a long cord that drops voltage is a common cause of failure... at startup, a compressor motor draws a ton of amps, and will burn up trying if it can’t easily get them. Been there done that. Try to use one unit only when plugged into 30 amps or use your generator.
If you’re luckier, it is just the start capacitor on each unit; it may have gone out before the compressor had a chance to get damaged. Take the coach to a reputable facility that will check and fix the capacitor if it’s failed rather than sell you a new unit you may not need.
Joel
