When I mentioned running the AC on high, I meant the fan on high. The AC will still cycle on and off. Of course that is if the room temp matches the thermo set temp. The fan will run continuously on high, but that will help keep the AC from freezing up..
Using the On/Off Mode set the digital thermo on FAN. Use the +/- to set the fan on HIGH. Then using the On/Off Mode set the thermo on COOL. Use the +/- to set the desired temp.
One more thing. When the fan is set on AUTO and the actual room temp is 5º or more, the fan will run on high. When the actual room temp reaches within 4º or less than the set room temp, the fan will stop for a couple of seconds then come back on running on the LOW fan setting.
The first couple of times mine did this I though I had a problem. Until I read the manual!
Good luck. I hope this helps.
Dometic Digital Thermostat.