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Not defrosting n380fc Kelvinator, have had timer replaced but still not defrosting

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Sounds like you have a bad defrost heater, Changing it is rather involved and you must remove the freezer section back panel to gain access to the heater to check it, it sets in front of the evaporator coil. Good Luck ....

Posted on Mar 22, 2014

  • James Gardner Mar 22, 2014

    Have replaced the timer, Will defrost if you turn the timer, but what sends the signal to the timer as it is not kicking in. Also fridge is to cold, cannot turn it down anymore, so I am assuming it is a bad thermostat not sensing the how cold and thus not kicking the defrost in to.

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Where is the defrost thermostat located on kelvinator freezer


Depending on the model you pull the cover from evap coil and you will see either a bimetal thermostat or the timer

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We bought a kelvinator ref KTD300MN. I would like to ask if the freezer inner rear wall should form some ice? thanks.


No.


DEFROST PROBLEM
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(disconnect the two wires plugged into it and twist them together) 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.

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I have an old (35 years) Kelvinator No Frost 480 which seems to be functioning, but not cooling the bottom half of the fridge as it should. The cooling elements seem to freezing up. The fan and compressor...


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Sorry to hear about your problem.

Sounds like you have a defrost issue. Hence your unit is not defrosting. All of this apply's if your freezer side has ice on it. If not. you have other issues, this does sound funny, but this is why your refrigerator side is warm, or not cooling.

Here is a list of some things that can go wrong.
1. Defective heat coil
2. Defective defrost timer
3. Defective defrost sensor
4. Defective Fan
5. Defective compartment inlet damper (on some models)

You should call a service company to resolve your issue.

Since I tried to help you, Please help me and Rate/Vote on the response. Thanks

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1 Answer

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I have replaced new door gasket.
Freezer gasket is in very condition.
Compressor drawing 3.15amps.
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masood
masbimed@yahoo.com

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1 Answer

I can't get my fridge to turn back on after defrosting it.


Check the defrost timer.

The defrost timer could have automatically cycled to the defrost mode which means it should come back on in 15-20 min. If it doesn't then the timer could be stuck in the defrost mode.

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