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Coils freezing up, dropping temp Where is the defrost timer located?

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The defrost timer and be on the roof of the refrigerator the floor of the freezer or the main board in the back of come refrigerators...
Check out these tips...they can help you figure out whats going wrong with your refrigerator and why it is not cooling

Refrigerator not Cooling or Fridge not Cooling

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heatman101

Posted on Sep 11, 2010

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Evaporator freezing up


defrost is usually controlled by is defrost timer,

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Freezer side not freezing


Check for ice / frosting inside the freezer .... If present you probably have a defrost problem.... This causes the freezer coil to ice up and block the air flow ... the causes could be a bad defrost heater , defrost timer, defrost sensors, or control board. Also make sure that the condenser coil is clean. remove ALL dust with a vacuum and a coil brush .the coil is located either on the bottom or on the back side of the unit... You didn't give the Make and model #

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I have a Kenmore upright freezer model# 253.9260210. We noticed that our food was starting to thaw. I opened up the coil area and noticed a small piece of ice on the coils. I melted the ice and turned...


Feel top of the compressor and tell me how hot after it has been running awhile. I need also that you advance the defrost timer=>. 216517400 Defrost Timer
12_9_2012_4_41_32_pm.jpg

clockwise slowly untill the compressor stops or starts. I need to make sure the timer is not stuck into defrost. I want you to leave the compressor off for up to 35 minutes. If the freezer compressor doesn't restart bt then simply again turn the timer clockwise slowly until it does and then stop turning. The defrost timer is location 23 in this photo HERE If you need to turn the defrost timer like this to restart the compressor then replace the defrost timer and this will resolve the freezing problem. If not we move to the defrost heater location 14 in the sme photo=> 216254600 Defrost Heater
12_9_2012_4_51_55_pm.jpg

I am going to stop here until I hear from you, Thanks Sea Breeze

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1 Answer

With the temp control set to less then 1, temp on the bottom of refrgerator is 25-30 degrees and on the top shelf it is 45-50. With it freezing on the bottom I get a block of ice and the drain freezes up....


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.
You can post your model number into one of several appliance parts sites on the internet and search for defrost components to find your parts.

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1 Answer

It seems that the temp more often goes up to 20-30's and that food is not as frozen when I check it. When temp goes up I check it for next couple of minutes and usually within 10 min the temp is back down...


This is normal. All commercfial freezers must defrost 3 to 5 times a day, or they will freeze over at the coil and then stop freezing. A timer in your freezer turns off the compressor and turns a heating element on for 10 to 15 minutes. During that time the coil heats and melts frost from the coil. Usually within 30 minutes the temperature will briefly rise to 20 t0 25 degrees F and then quickly drop down to 0 degrees F. The food rarely defrosts in this short period of time..

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1 Answer

Whirlpool Mod ET18LKXHWo o Fridge not freezing,


Your defrost timer located inside the control panel is bad OR the defrost thermostat located on a freezer coil is bad.
Get down low and look up at the bottom of the control panel.
You will see a small round hole. Onside the hole is the defrost timer advance knob.
Use a flat blade screwdriver and SLOWLY turh the slotted knod clockwise until the refrigerator clicks off.
Wait a few minutes then open the freezer door and listen for a sizzling sound from the freezer compartment.
If you do hear a sizzling sound that would be the defrost heater melting ice.
If you do not hear a sizzling sound,unplug the refrigerator and remove the rear freezer panel to expose the cooling coil.
Clipped to the coil will be the defrost thermostat. It will need replacing.
If you do hear the sizzling sound the defrost timer will need replacing.

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Defrost not working


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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. You can post your model number into one of several appliance parts sites on the internet and search for defrost components to find your parts.

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1 Answer

The coils freezes up frequently. Most recently,


If your defrost timer is not working then you will have problems with freezing the coils. When it is humid out and you are in and out of the unit the problem will be worse. To eliminate this problem you will need to get and install the timer. Do a search for "appliance parts" and checkout a number of the suppliers as the prices can vary a lot. All you need to find your part is the model # and sometimes serial# of your unit.

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The freezer is freezing to the extreme fridge not cooling at all


If freezer is icing up, you might have a defrost problem. Frost free models have a heating element that is controlled by a timer to automatically defrost ice, ie defrost timer turns on defrost heating element every 12 hours to melt ice in freezer and allow good air flow.
You can test defrost element with an ohm meter(located inside freezer coils-will have two wires going to a plug connection), if OK replace defrost timer (located in various places depending on make and model also check the termination switch inline with the elements

Aug 09, 2009 | Refrigerators

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