Originally Posted by dangerruss
I have a ducted Dometic AC in my 5th wheel. When having the air vent opened to just the main area the AC works great. When I change the vent to force the air through the ducts the AC freezes up with very little airflow to cool the trailer.
Is this a design flaw of the Dometic unit or do I need to replace my AC?
Anyone else experience this problem?
We were having the same issue on a new 2019 FXS 260RT.
Mine is ONLY ducted...do not have the 'dump' feature....and no thermostat...just the dials on the unit.
Read a post on here about folks thinking the A/C worked like the one in your home...not, its only going to cool down so much from ambient temp...and another post about the divider between the return and discharge air paths.
I found the divider between the return air and discharge air was not in place properly...was cocked allowing the air flows to mix...fixed and sealed that and still would freeze up.
We found that...after the unit cooled down to a comfortable temp if I would turn up (warmer) the temp dial till the compressor would cycle off and it would continue to maintain that temp...and cycle without freezing up.
This method has proven functional for us in the Texas summer heat and in the mountains of Colorado.