AIR COND QUESTION???

Some trailers have their thermostats mounted where they are affected by the conditioned air. So, at the thermostat, it is cool enough for the thermostat to signal the A/c unit to turn off. But I'm thinking your problem likely is different. Are you using the high fan speed? I know there isn't a big different between the two. A common problem is between the intake side and the output side of the ac grille. There is a divider that should completely separate the return air from the conditioned air. The divider often slips and the conditioned air is sucked back into the return air, making the a/c ineffective. When the unit is running, is it as cold as you expect it to be? Sorry for the questions.

Do you have any way to check the voltage in the RV?

I have a Dometic brisk air ll ( non ducted) in the bedroom roof over the bed. It was on recently then seemed like it was trying to SAW UP MY ROOF !!! Turned it off quick as i could. Later tried and same experience ! What happened -- & can it be fixed or does it have to be completely replaced. ?

choppinwood pull the inside and outside covers and check the fan blades could be one has thrown a blade or the blades are hitting something.