Duo Therm 3109228.001

SOURCE: I have a suburban lp furnace and duotherm air/heat

I'm not sure what the problem may be but you could try calling All Seasons RV Appliance Parts & Service. There number is 1-800-344-0673 they have helped me in the past. That and there tech calls are free so it wouldn't hurt to give them a call.

SOURCE: Duo-therm rooftop RV a/c - one unit cools fine,

Hi, you would need to get up top to find out what is going on. Remove the cover, check to see if the small condenser fan motor is on and running, if not, touch it carefully after it has been on a while to see if it is hot. If so, try giving the blade a spin. If nothing, this will be your problem. Check to see that the compressor is also on and running. Feel the copper lines coming from it, one should be very cool to the point as to condensate. Be very careful with the smaller discharge or liquid line as it could be around 110 degrees F. Look at the run capacitor to see if it is leaking oil, swollen up or even busted or split open. If so, this will cause your compressor not to run. Look it over and keep me posted. It may have a small leak and has lost its charge also. Get back to me and let me know what you have found. Make sure you have the correct voltage to it also.
Sincerely,
Shastalaker7