We have an N811 so my ears opened up when Doug mentioned the "defrost" which I put it quotes because it seems to do more to let the fridge go warm, than it does to clear the fins of ice. Armed with Doug's explanation and results of some hard experience, here's what we do:
Cycle the N811 to OFF for a couple minutes around noontime, every day.
Realized the doors aren't solid enough to seal. The latches hold a foot or so of gasket against the sides of the fridge, but don't seal down to the bottom of fridge or up to top of freezer. Trying to "spring" the door(s) so the far corner from the latch hits the gasket first, does not help. Door isn't stiff enough to hold that shape. So, the Fridge Gestures: Close Fridge includes a Knee to the Lower part of the Door. Close Freezer includes a High Five to the Upper part of the Door. Utterly amazing the difference this has made!
When the Fins get fouled with Ice, we have a squirt bottle. One that does a Stream. Fill with hot water, open the Fridge and spray the Fins just as fast as I can. Takes a little over a minute. Close Fridge with Knee. Defrosted! Ours has an outside catch cup for the water. I haven't run it over.
I have a couple little 12VDC computer case fans helping convection over the outside coils, too. These few little changes have allowed us to keep using our 16-year-old N811.
If God's Your Co-Pilot Move Over, jd
2003 Jayco Escapade 31A on 2002 Ford E450 V10 4R100 218" WB