690 set at 0 in freezer, but is running at -15 N ice build up.

SOURCE: Freezer set at 0 degrees, but runs at 19 degrees. Ice Cream melting...

Low on freon/refrigerant maybe.

SOURCE: Hidden Ice build-up inside plastic bottom cover of freezer

Generally, icing is the result of too much water vapor inside the unit, blockage of the circulation channels and too much packing in of the box.  The water vapor is generally caused by: uncapped items in the fridge, opening the door too often, humid conditions, bad door seals.  There is of course, there is a possibility that the defrost cycle on the unit is not working.  About once a day, depending on the brand, you should notice that the fans and compressor don't run and you should hear a bit of creaking, sloshing or other strange noises as the ice melts.  If this is not happening, your defrost timer or the coil it heats could be bad.

SOURCE: Neverending ice cystals buildup in freezer

Hi Rachel,

Opened 3-10 times per day, per week, per month?

There is only one possible source of these ice crystals -- moisture precipitating from the air (condensate) -- this air is coming from outside the freezer. It's either getting in when the freezer is opened or coming in around the gasket.

You might try a very thin coat of vaseline on the gasket to get a better seal.

Charlie

SOURCE: Leaking water and ice build-up in freezer

There's a drain hole in the freezer side behind the bottom drawer in the back wall that must be clogh ; put hot water into it untill melted the ice and keep pouring water to clean the drain (don't worry , the water goes to an evaporative tray) .Keep the drain clean by putting every 3/4 months half a cup of clorox or bleach.

SOURCE: Subzero freezer has frost/ice build up on the

Check the fan and readjust temperature control to higher. Thanks.