Question .. When you say it "Shuts off" do you mean COMPLETELY both blower and compressor.. Or just the compressor?
The reason: Both motors have thermal cut-outs on them self-resetting Thermostat type switches that if the motor overheats.. CLICK and it shuts down.. Eventually... as it cools... CLICK and it starts back up.
These switches however operate INDEPENDENT of each other. Each motor has one.
On many, most in fact. A/C's in addition to the over temp switch in the motors there is a "FROST" sensor stuck in the evaporator coils.
This will shut down THE COMPRESSOR if it detects icing of the condenser.. Others have already explained what to do.
Finally your A/C uses TWO power sources if it has a wall thermostat or a remote control (only one if it has "Ceiling controls")
12 volt is used for "Remote" control (Wired or wireless) 120 volt for Operation power (Local controls use human power only)
ONe issue I had with MY RV, when it was new. Sometimes the front A/C worked but not the rear. Sometimes the opposite. Sometimes both and one time neither.....
TUrns out I had a few screws loose
The screws in the 120 volt power distribution panel that hold the wires.. All 3 colors
Thw screws in the breaker wire clamps (Black)
The white bus bar and the green/bare bus bar all had loose screws.
(Now some folks still claim I have a few screws loose but I don't know what ones they mean. I have checked all the screws in the RV and they are nice and tight...).
