If you have a good working refrigerator that suddenly doesn't work well, here is something to check.
Last week, in 97-degree weather, I turned on my, formerly great working, refrigerator early in the morning of the day before leaving for a weekend rally. That evening, I stopped by the trailer only to find that the refrigerator was barely under 70 degrees inside.
After some serious troubleshooting, I found that when I had cleaned the refrigerator after the previous trip, I had bumped the "low ambient" switch to the on position. This switch, along with the heater switch to prevent condensation, is almost invisible under the top frame of the freezer door, a terrible place to put these switches at the very best. The heater switch, had it been on, could have drained my batteries.
I now have a piece of tape holding these two switches in the closed position.
John W. Irwin
2014 Touring Coach, "Sabre-Dog IV"