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On a chest freezer, frost always accumulates around the top perimeter first because the warmer moist air comes in contact with that area first once the door is opened. More frequent defrosting may be the answer.
as its a chest freezer you have no auto defrost,so you must do it your self.make sure all food is wrapped/heat sealed bags.to stop moisture/frost from building up.use a freezer thermometer to set at
-18C and do not over fill,if you live in a high humidity area then every other month is about right.DO NOT DEFROST WITH STEAM OR HOT AIR.USE CAR DE ICER .then dry thoroughly.
All the cooling for both sections takes place in the freezer behind the back wall. A fan back there distributes the cold air throughout the freezer and fresh food section. Every 8 - 10 hours a heater comes on for about 20 minutes to eliminate the frost from the evaporator coils back there. If this defrost cycle fails the frost will build up to a point of no air flow so the fresh food side and most of the freezer start to warm up.
The best way to take care of this is to turn it off and unload the freezer, take the shelves out and the screws holding the back panel inside the freezer out. Remove the back panel from the freezer. Use hot water and a hair dryer to unthaw the ice and frost, you will need lots of towels as the melting will bring lots of water on to the floor. Once the frost is gone you will need to install this part WR51X443. The picture below shows it. The kit contains new heaters and thermostat.
Good day, The interior walls should frost evenly. If you only get a partial frosting pattern then either you have a refrigerant leak or a restriction in the refrigerant lines. Either problem would be considered a terminal failure in a chest freezer.
It would appear to me the system has a leak. Allow me to explain. When a fridge/freezer is "lo" on gas it causes the compressor to run far longer than usual. As a consiquence the motor overload shuts it down, potentially for a very long time, hence the contents thaw. The major clue to this a frost pattern on just one wall. Have a tech visit to confirm, but I suspect you'll be out of luck as far as a repair goes. Chest freezers are not easy to repair "lo side" leaks, which is likely what you have, because the evap. coils are in the walls.
sorry, but I hope that helps in some manner.