[rohrmann]

This is from the Dometic 1350 fridge owners manual:


The refrigerator has been design with an automatic cooling
unit cycling system that helps reduce frost build up in the fresh
food compartment. The first automatic frost reduction cooling
unit cycle begins 60 hours after turning "on" the refrigerator
(for best operational results the refrigerator should be turned on
anytime between 4 and 10 PM), and will last for approximately
120 minutes. Thereafter, the cycle will automatically repeat
every 48 hours as long as the refrigerator continues to run.


We have a Norcold, which also has a defrost cycle system, and we see a temperature fluctuation as well and is usually from the defrost cycle. We also have the ARP device, and it has kept our unit working well, especially after not having the ARP device and having the cooling unit fail twice in one year. Our fridge is usually about 34 to 40 degrees and the freezer section runs from 10 to 20 degrees. Along with the ARP device, we also have the ARP fans that the device controls independent from the factory fans, and this really makes a huge difference in how the fridge operates.