Front AC wont stay on

[carolinagirl]

The front AC unit will not stay on in auto or low
2014 Winnebago Adventurer
The back AC unit seems to be working fine

My initial thought was thermostat. But with the back unit working, I am thinking not thermostat, but as I type this there is probably 2 diodes on for the back and one for the front, but I am not sure?

The other thought was ( we leave the unit running all summer) the unit may have frozen with our high humidity? I only have a 30 amp so cant run both at the same time..

Any ideas?

thanks