We have a Norcold 2 way refrigerator and find that we can go for several months without the need to defrost. When we are not traveling the coach is unoccupied and therefore the refrigerator door rarely gets opened. We check it monthly and clean it up or defrost it about every six to 9 months. We traveled on 3 separate occasions this year for a total of about 15 weeks. The last time we defrosted our unit was in early March. We do keep the refrigerator on all the time If you have a stand alone icemaker, they need to be defrosted more frequently. However, we empty ours out, turn it off and leave the door open slightly when we are not using the coach so it hasn't had to be defrosted this year. The little frost that collects during a 1-2 month usage naturally defrosts itself when you turn it off and leave it open.
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