Question about Sub-Zero 690 Side by Side Refrigerator
Is the freezer side empty or nearly so? All modern frost-free units must go through a defrost cycle every 8-12 hours of accumulated running time. That figures out to every 20-40 hours in real life, and the box will be in defrost for maybe 15-30 minutes, depending on design. If the box is full of frozen food, the cycle goes unnoticed as you cannot freeze and thaw food that fast (the food actually keeps the compartment cold during the cycle). However, if the box is full of air, the temperature can change very rapidly. I suspect this to be your case. I am dumbfounded that your servicer didn't explain this to you.
Posted on Jun 28, 2009
Ok, if your defrost heater is open circuit, the unit will sit doing a 'natural' defrost until the temperture rises enough to allow the defrost ntc to sense defrost, hence the defrost times longer than normal.....
Posted on Aug 01, 2009
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Posted on Jan 02, 2017
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