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Need to replace defrost heater in freezer

Coils freeze up

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It could be the defrost time clock. if this is a self contained freezer the timer is kind of oval in shape their is a small hole with flash light should see some thing moving if not it's the timer you can turn adjusting stem until you hear it click that should put in defrost if you have an amp meter you can measure the amp draw should be around 2-3 amps or their is a klixon high temp limit is bad you likely need service. Tom

Posted on Jun 17, 2009

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1 Answer

Afb910 freezer not freezing


If the refrigerator is not defrosting, the defrost control board might be defective. The defrost control board monitors several conditions and determines how often to run the defrost cycle. If the board fails, the refrigerator will not go into the defrost cycle. Eventually, ice will build up on the evaporator coil and then the refrigerator and or freezer will not stay cold enough. This will depend on where the evaporator is located. It's prudent to check the defrost heater and defrost thermostat for continuity before replacing the defrost control board. If that is not the problem then the coil might have a hole in it and needs repair and coolent rechrge.

Aug 26, 2014 | Freezers

2 Answers

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 #

Apr 04, 2014 | Freezers

1 Answer

Why do i have ice on the freezer coil when the heater is working on defrost mode


Sounds like a fan problem. Have you checked the fans operate when the doors close?

May 06, 2012 | Freezers

1 Answer

MY FREEZE WILL NOT GET COLD OR FREEZE ANYTHING


Hello,
Check the temperature setting
Assure that there is enough room for air flow in the freezer or freezer
Check for air flow restrictions in vents
Test the temperature control
Clean the condensor coils
Check the door seals
Test the door switch
Test defrost heater
Test defrost timer
Test evaporator fan
Check for a clogged drain tube
Check for refrigerant leak
Freezer is too cold

Check the temperature setting
Test the temperature control
Freezer is noisy

Hissing and popping is normal, it is the defrost heater.
Check that the freezer is level
Check the drain pan
Check the condensor fan
Check the evaporator fan
Inspect the compressor mounts
Freezer runs continuously

Defrost the freezer
Clean the condensor coils
Check the door seals
Freezer starts and stops frequently

Clean the condensor coils
Check the outlet voltage
Test the condensor fan
Test the compressor relay
Test the overload protector
Test the compressor motor
Freezer does not defrost automatically

Test the defrost timer
Test the defrost heater
Test the defrost thermostat
Freezer has an unpleasant odor

Remove spoiled food
Clean freezer interior with a solution of h
Clean freezer interior with a solution of hot water and baking soda
Clean the door seals
Remove breaker strips and check for wet insulation
Water on floor outside of freezer

Check the drain pan
If you have an ice-maker, check the water supply hose going into and coming out of the water inlet valve
Water inside the freezer

Check for a clogged drain tube
If you have an ice-maker, check freezer and ice-maker for level.
With all this it helps to solve the problem....

May 04, 2011 | Kenmore 14.1 cu. ft. / 399 liter Upright...

1 Answer

Fridge freezer problem


Sounds like the defrost system of your freezer is not working. It could be either the defrost timer, defrost thermostat or the heater has a problem. The defrost timer turns off the compressor periodically to sent power to the defrost heater via the thermostat. The defrost heater then powers up and heats the evaporator coil to melt the accumulated ice buildup on the cold coils. Most likely issues are that the timer motor is not advancing the timer or the heater itself has burned out.

Jul 14, 2010 | Freezers

1 Answer

Freezer won't freeze



If the evaporator coils behind the back panel of the freezer are icing up because of auto defrost failure that will stop the circulation of cold air and eventually affect the freezer too.
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.

Nov 08, 2009 | Frigidaire Freezers

1 Answer

1999 Frigidaire Refrigerator


Check rear wall of freezer by feel for frost. Heavy, even frost indicates likely problem in the defrost system. Unplug unit. Defrost heater (in freezer behind rear wall panel), defrost thermostat (same area-must be checked at freezer temperature) or Defrost timer-located lower back outside of unit. Near compressor. Do continuity test on heater and defrost thermostat and if they show continuity (good), replace defrost timer. If not, replace the one that tests bad.

Defrost coils fully. Reassemble.

Please let me know if I have helped with comments and rating.

Refrigerator will work about 7-10 days after being defrosted until thick frost builds up again cutting off air flow to both compartments

Sep 07, 2009 | Frigidaire Freezer 20.3 Cu. Ft. Frost Free...

1 Answer

Ice under the cover


You can use a hairdryer to speed it up but you need to fix the defrost sytem.
How to check everything http://www.acmehowto.com/howto/appliance/refrigerator/refrigerator.php
check defrost timer, defrost heater, defrost thermostat. In most newer models the timer has been replaced by an electronic control board. If the heater and thermostat are ok it’ll be the control.

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. If it doesn't, check the heater and defrost thermostat. Turn the timer again till everything starts back up to end the defrost cycle.

Aug 20, 2009 | Kenmore 16.7 cu. ft. / 473 liter Upright...

1 Answer

I have a whirpool deep freezer that is not freezing. Can someone please help me with this.


If it is a frost free How to check everything http://www.acmehowto.com/howto/appliance/refrigerator/refrigerator.php
If the evaporator coils behind the back panel of the freezer are icing up because of auto defrost failure that will stop the circulation of cold air


check defrost timer, defrost heater, defrost thermostat. In most newer models the timer has been replaced by an electronic control board. If the heater and thermostat are ok it’ll be the control

Jul 13, 2009 | Freezers

1 Answer

Traulsen URS36DT:


checking a def system is kind of easy. if you have located the defrost timer just turn the little knob on the timer until the unit shuts off, shortly you should hear "hissing and pooping" from water dropping on the heater. this lets you know that the defrost thermostat is good. if you dont hear this noise check your def thermostat and heater for continuity. if you put it into def and the heater comes on then you have a bad timer..

Dec 11, 2007 | Traulsen 7 cu. ft. / 198 liter Commercial...

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