Dometic ac not cycling properly

Brandon327 wrote:
The thermostat is the dometic digital and this is the third thermostat that has been put in. Can't use one of the cheap $20 units because of the way it is wired with the control board in the ac unit.

It is NOT Dometic's fault. It is where the OEM mounted the wall tstat. You are trying to get too specific on the actual set temp. If you could install a $20 tstat, you would have the same problem, as that tstat would be sensing the air in the same area. Doug

The thermostat is the dometic digital and this is the third thermostat that has been put in. Can't use one of the cheap $20 units because of the way it is wired with the control board in the ac unit.

Old-Biscuit wrote:
Is the thermostat analog or digital?

Analog can have 5* swing between actual temp and set point temp.

Correct. From your post move the temp up or down a few degrees. The wall tstat may NOT be in the perfect ideal position for sensing the actual room temp. Doug

First check under the roof top cover is the fins clean? Dirt here will cause some strange things to happen as in slow response time and as said above change to a digital stat. for better control this may save a trip to a dealer stealer for a wallet work out..Bushman

Is the thermostat analog or digital?

Analog can have 5* swing between actual temp and set point temp.

The thermostat tells the A/C unit to run or shut off. If the thermostat tells the A/C unit to run, and it DOES NOT RUN, the problem is likely with the a/c unit. HOWEVER it it most likely a bad thermostat. Incorrect wiring between the thermostat and the a/c unit is always a possibility.

My suggestion is to replace your thermostat with a cheap digital model from WM or similar source for about $20. Digital thermostats control the temp much more closely than other thermostats. Lots of information about digital thermostats if you search.

May just be factory defective.