What to check first
Check thermostat mode and accessible return-air filter per the unit manual; note outdoor temperature and whether the fan and compressor run.
When to get help
If cooling remains poor or ice forms, request appliance diagnosis. Refrigerant and electrical service require qualified help.
Your RV’s make, model and component instructions control. Stop use and seek qualified help for propane odor, smoke, active electrical danger, unsafe braking or other immediate hazards. This guide does not diagnose your RV or establish part compatibility.
Next step
Check the exact component manual and model number before following a model-specific procedure.