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I have about 15 yr. old Sub-zero Refrigerator. Lately there are some frost forming on the wall inside it. Please help!

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Try to defrost it by un-plugging it, and letting the frost melt. Also, you could try to up the temp settings inside the fridge or freezer and not have it set at the lowest setting. Try the recommended setting from the manufacturer.

Posted on Feb 04, 2010

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Sub Zero has a timer to defrost the freezer [twice daily] which disengages the compressor and turns on heaters mounted on the coil and fin assembly behind the sheet metal cover at the back of the freezer. It also has a fan to distribute the cooled air in the freezer. If the fan fails, you will get frost buildup on the back wall.
If the timer doesn't work, you won't get the defrost cycle, and if it sticks in the defrost position, your freezer will warm up and thaw your goods. If the freezer does not defrost, you will also get a frost buildup on the back wall.
If you hold the switches at the top of the doorframe closed, the fan will come on for one switch if it is working, and the internal lights will go out for the other switch.
The timer is in a little box above the freezer, behind the removable cover. It is mounted to the right side wall, near the front. It has a little hole where you can use a flat blade screwdriver to turn the timer armature. If you turn it, you will hear it click, and hear the fan and compressor [left side compressor] turn off if it was running.
tom

Posted on Feb 25, 2010

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