Why frost builts up in the coils
Frost will normally build up if you do not have frost free freezer and in which case it is possible the frost free system is faulty. If it is not frost free then it has to be defrosted a few times in a month. However if the frost comes up very quickly then there are possible causes.
You may be having leakage from the door seals or there are items in the freezer that are not properly covered to avoid moisture escaping. Other possibility is that your freezer is set too cold and there are not many items in it.
SOURCE: frost in Kenmore frost free
Although you say the seal is fine, this is almost certainly due to air getting in. With the door closed check that there isn't a tiny gap with a strip of thin card or plastic. Of course if air is getting in then it must also be getting out somewhere else so probe all around the seal.
SOURCE: fan continuously running, non-stop
hi thanks for the question its normal for a frost free freezer to run a long time to keep a good cold temp i don't think you have a problem thanks the appliance doc
SOURCE: frost build up in a frost free freezer
It could be the door gasket. It could also be that the fridge needs a good defrosting. (especially if it is an older fridge)
When I bought my house I had the same problem with the fridge that came with the house. I assumed the previous owner had been defrosting it regularly, which he had not.
Eventually I decided to try a full defrost, and my fridge now works like new.
SOURCE: ice built up in the frost free freezer section
It sounds like the freezer fan(evaporator) is wearing out. This problem is very hard to diagnose because the fan spins but no fast enough to circulated the chilled air thru the freezer and refrigerator. The parts and labor are around $300.00
SOURCE: My upright freezer won't self defrost. Frost builds up right awa
The evaporator coil behind the cover on the back
wall inside the freezer will ice up under normal conditions. Every 8 to 10
hours for around 20 minutes the defrost timer (or in most newer models the electronic
adaptive defrost control) will turn the defrost heater on to
melt the built up ice. There is a defrost thermostat which prevents the heater from
overheating the freezer by breaking the heater circuit when the temp reaches
close to 32 degrees F. The entire cooling system shuts off during the defrost
cycle and starts back when the timer advances through the cycle.
If this ice is not melted it will continue to
build up until the air can’t flow over the coil to circulate the cold air
through the freezer and into the fridge. The temperature change in the fridge
is usually noticed first followed by the freezer.
If the defrost thermostat is bad it can prevent the heater from
coming on OR it won’t turn the heater off when it gets too warm. It is clamped
to the evaporator coil at the top to sense the temp. If it appears to be
misshapen it is bad.
With an ohm meter it should show continuity when
cold and none when warm.
You can also bypass the thermostat to see if the
heater comes on then. If it does then you know the thermostat is bad and needs
replaced.
The defrost heater is
located on the evaporator. It is in a tube which is at the bottom and can also
go up the sides of the evaporator. On some types you can see a burnt spot if
it’s bad. With an ohm meter it should show continuity from end to end when
disconnected from the wiring in the freezer. You can also test the wiring for
voltage when it’s in the defrost mode.
If
you have a defrost
timer you
can test it. It can be located under the fridge behind the kick panel on the
front. Some are in the fridge with the controls at the top. You can turn the defrost timer till it clicks and everything shuts
down. The heater should now come on. If it does, replace the timer because that
means the timer is not running. If it
doesn't, check the heater and defrost thermostat. Turn the timer again till
everything starts back up to end the defrost cycle.
If you have an adaptive defrost control instead of a timer,
replace it if the heater and thermostat test good. It is located in the fridge
with the controls in some models and on the back in others.
If you need help finding your model number see
here> http://www.appliancepartspros.com/modelnumber_locator.aspx
To locate your timer, motherboard, control or adaptive
defrost control , enter your model number and search for the part or post back
on Fixya.
http://www.searspartsdirect.com/partsdirect/index.action?psid=26129238&sid=PSx20071217x00001a
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