Time for a thorough cleaning. Full defrost. Pull your home vacuum outside and vacuum the coils and blow lots of air up through the cool chimney. Tighten all screws on the stuff in the propane areas going to the chimney. Unplug the AC, disconnect the wire that's labeled 12 Volt on the board. Pull off the controllers cover and vacuum that board off.
Okay, so now, use contact spray and a pair of needle nosed pliers and spray the board terminals than tighten all the terminals on the wires going to the board. Pull off each wire in turn and squeeze their terminal. Return them to their terminals on the board. Do the same for the 12 volt supply terminal. Plug the 12 volt back in, and then the AC cord.
Now, on the inside, with the ice all gone, repack everything making sure you don't block the flow of cold. Remember that cold falls.
Than, you might consider installing a fan inside your refer portion. That stirs the air in there and really prevents ice build up. I'm going on 4 years now and still no ice build up on the fins in the refer, all because of the fan.
Here's a link to my fan articles...if you have a 12 volt computer fan already, doesn't cost you anything but some wire and time, and the fan:
Refer fan, Norcold
And here's what I did with my previous Dometic:
Dometic refer fan...
The freezer is likely going to get frost build up even with the fan but you'll find it's much less. With a double style refer, it probably wouldn't hurt to put fans in the outside vent. Than of course, using a dollar bill see if your door seals are okay...not leaking. The bill should be very hard to pull out. Look for moisture on the door too...that's another tip off of a seal leak.
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