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I would suggest that you visit an ac specialist shop as all air conditioners( car, truck , house and yours all use the same principle of operation
because it is roof mounted in an RV may be a caravan repair shop that has an ac specialist in the workshop or a truck service shop that installs ac units in truck cabins would be a good place to start
Take the cover off to see the data plate. There may be one inside by taking the inside cover that holds the louvers and filter in place. If it needs to be recharged, then there is a leak in the metal tubing. That has to be located and repaired first. Install a drier on the low side to absorb any moisture let in by the leak before evacuating the system for freon.
there is a fuse located under the shroud on the roof AC on a circuit board that controls the thermostat to turn on the power to the Air Conditioner replace it it is marked F-1 or, on some F-2 etc. the air conditioner works on both DC voltage for the thermostat and AC voltage for the compressor
Normally, the condensate will drain out of the unit onto the roof and off the edge to the ground. Remove your cover inside (probably 2 screws) and tighten the 4 bolts you will find inside. If they are tight, go to your RV supply place and get new roof gasket. Remove the AC and insert the new gasket and resecure the AC to your roof.
I see what you see also in the manual. The difference is the Heat Strip package that part is optional and the 600212-001 with the optional heat strips becomes the new 600315-001 I talked to Dometic Duo-Therm and the models are the same but they both are not heat pumps but the new heat strip package comes on when told to go into heat mode when you change the thermostat to heat. The part you purchased will fit both model numbers you listed for your roof top air conditioner. Thanks, Sea Breeze
2 things to check, one is remove filters on inside & look at front coils to make sure they aren't frosting/freezing up. The other, remove cover on upper unit & check that drain holes in base are not plugged. Be careful of wasp nests when removing cover. If neither one of those is problem, you may have a cracked drain pan, which you can also observe/inspect when cover off on roof unit.
I had to get on the roof of mine, remove the cover and manually spin the fan. Add a little oil to the shaft where it goes thru the bearing. All of this is done on the roof side. Mine required this procedure every spring. Duotherm realizes they had a problem and have since corrected it but they don't deal with all of their customers that had the original problem.