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Tyler Z.
Tyler Z., Appliance Doc
Category: Appliance
Satisfied Customers: 74300
Experience:  9+ years being an appliance technician with factory training.
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Sub-Zero Series 500 model 550 Ice forms on the back wall of

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Sub-Zero Series 500 model 550 Ice forms on the back wall of the refrigerator, about mid way from the top, left corner. Can there be a leak in the water supply or something else?
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Is the ice forming a clear block of ice? or is it a block of white frost?

Customer: replied 4 years ago.
it is clear ice, from along the back wall, much more than frost
ok perfect, thank you. This sounds like a very common issue and it means that your defrost drain line hasclogged up and will need to be thawed out if frozen and cleared out. This often times happens for no reason at all and is just random. You will need to remove everything out of your refrigerator and remove the back panel inside the refrigerator. Use a hair dryer to thaw all the ice out and locate the drain hole. Pour hot water down the drain hole until it's draining properly again. Once it's draining properly blow compressed air down to make sure it's clear. If you don't have compressed air, use a turkey baster to make sure the drain line is clear and draining properly.
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