I don't have your problem, but I do have a question about reefers that Old-Biscuit might be able to answer.
I have a 1200 LRIM that came with the rig when I bought it.. It sucked, so I replaced the entire cooling system with a new one from RVCoolingunit.com/. The reefer seems to work pretty well now... under certain conditions... like outside temp < 80f. Once the ambient passes ~80, the inside temp starts to follow it up. AND it's next to worthless on the road.
I can start off with the inside fins at ~20f, but by the time I can reach the interstate to go somewhere (30 mins), the fins will be at 30 or higher .. and continue to go up until the inside reaches about 50f. The freezer(s) are still around 20f, but the interior is spoiling milk.
Do ANY of these things work 'on the road'? IIRC, when I installed a NEW one in my old 1994 rig, the reefer worked 'decently' (not GREAT) on the road, but this one just won't keep up. I've tried every trick I can think of. More outside cooling fans.. less cooling fans.. checked the stack.. checked for leaks around all the doors (especially the flap between the 2 big doors)... the back 'flu' across the coils, etc, etc.
We don't have enough inverter capacity to run AC, so it's always on LP - but that works just fine when sitting at home.
PS.. I know I SHOULD start a new thread, but at least with this thread, I KNOW someone is already watching it