I have just gone through reading the manual and ARP instructions for our 2118 and the defrost on them happens every 24 hrs and lasts 2 hrs. The ARP 3.1 allows the user to skip defrost by a defrost override. It does this by shutting the fridge off briefly once a day to reset the fridge's 24 hr clock. The fridge then doesn't warm up for 2 hrs every day and then have to struggle to cool it down again.
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