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here are lots of things that can cause cooling problems. One of the most common causes of poor cooling in a frost free refrigerator is a defrost system failure. In such a case one or the other compartment may appear to be keeping proper temperature but that too may change in a short period of time. The fridge compartment's temperature rise is usually (but not always) the first to be noticed. Frost" and "Ice"
There is a difference between "frost" (a white, snow-like substance) and "ice" (usually clear and solid). When referring to what is seen during an inspection, please keep this distinction in mind as the possible causes for each are often very different. The Defrost System
Inspecting the (usually rear) wall of the freezer compartment for a frost build up is necessary. (In the case of many GE top freezer models, check the freezer's bottom panel.) If there is a frost coating on it, it is often a sign of excessive frosting beneath it. Sometimes however the evaporator cover panel will actually need to be removed (see the illustration below) before an excessive frost build will visible.
The refrigeration system's evaporator (cooling) coil is usually in the freezer compartment. This evaporator will periodically frost over and have to be defrosted by means of a heating system. When the defrost heating system fails, the frost can accumulate to such a degree that airflow throughout the appliance is hampered. There may be just enough air circulation to cool the freezer section but that will eventually stop too.
It could be the freezer is over-stocked and air cannot circulate but often it signals an excess of water vapour is getting into the freezer from overuse or a faulty or misaligned door seal or from unwise use of the freezer.
Frost build up in one part of a freezer could also mean a part of the insulation is failing.
POSSIBLY faulty door seals allowing outside moisture to enter freezer compartment. This is especially prevalent in older units and/or tropical climate zones [ie high humidity] ... OR if freezer is OVER-LOADED with food items !!!
If you are putting in large quantities of fresh produce to be frozen it is quite often better to PRE-COOL all the items in your refrigerator PRIOR to placing in your FREEZER as they will usually have a high moisture content which will cause frost build-up in your freezer ...
Poor cooling is often the result of a heavy frost
build-up on the evaporator coils. You can't see these coils without
removing a panel on the inside of your freezer. A sure sign that there
is a build-up is the presence of any frost or ice build-up on the inside
walls, floor, or ceiling of the freezer. Such a frost build-up usually
indicates a problem in the self-defrosting system or damaged door
gaskets.The refrigerator is supposed to self-defrost
approximately four times in every 24 hour period. If one of the
components in the self-defrosting system fails, the refrigerator
continues to try to cool. Eventually, though, so much frost builds up on
the evaporator coils that the circulating fan can't draw air over the
coils. There may still be a small amount of cooling because the coils
are icy, but with no air flow over the coils, cooling in the
refrigerator compartment is quite limited.Here's an inexpensive, though inconvenient, way to
determine if the problem is with the self-defrosting system. Remove all
of the perishable food from the refrigerator and freezer, turn the
thermostat in the refrigerator to Off, and leave the doors open for 24
to 48 hours. (Be sure to have several towels ready in case the melting
frost and ice causes the drip pan to overflow). This allows the
refrigerator to defrost "manually." When the frost and ice build-up has
completely melted away, turn the thermostat back to a normal setting. If
the refrigerator then cools properly, it indicates a problem with one
of three components in the self-defrosting system:The defrost timerThe defrost thermostat (also called the bi-metal
switch)The defrost heaterIf it still does not cool properly, there may be a
problem with the refrigerant level or the compressor. You may need to
consult with a qualified appliance repair technician to further diagnose
the problem
too defrost just open the doors for a day with the unit unplugged. as far as why it is frosting up check door seals make sure they are all good and seal it up well and that should take care of it.
It is possible to get this build up in the return vents. Check seals for any possiblilty of warm air getting into the fridge. Warm air getting in will cause this. For now use a hair dryer or some hot water to clear the vents. Let me know what you find. Would appreciate a solved rating for expert advice.
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