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My defrost system is not working. How do you check the defrost timer and the thermostat disk ?

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  • Kelly
    Kelly Oct 04, 2010

    We need a make and model number please to adequately help you. There are 3 different types of defrosting systems in use today and to explain all 3 at once would be a substantial post. Make and Model number please.

    Kelly

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The defrost thermostat electrically closes when the temperature is below 40 degrees F and opens when it is above. You can check it with an ohmmeter and it should read close to zero ohms when the temperature is freezing and infinity when it senses temperature above 40 degrees F.

The defrost timer typically runs the compressor for 6 hours then turn off the compressor and powers the defrost heater from about 30-40 minutes then the compressor is powered once again. The timer typically fails be not advancing causing the refrigerator to either stay in defrost mode, or in cooling mode. To check, turn the cam until you hear a click. With the refrigerator plugged in, it should turn off the compressor and power the defrost heater for 30-40 minutes. If the compressor does not turn on after 40 minutes, then the timer is bad and needs to be replaced.

Posted on Oct 04, 2010

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My Model #gts22wcp fridge stopped getting cold. freeezer works great. Only blows cold air into fridge if freezer door is open.


Possibly a problem with the defrost system. If the cooling coils behind the freezer wall start to build up too much frost or snow, the air flow to the refrigerator section gets blocked first. So the freezer still works but the fresh food section starts to get warm . As the frost continues to build up, in time the freezer section will only get as cold as the fresh food section should. There are 3 main parts to the defrost system. You could have a burned out defrost heater, a bad defrost timer, or a bad defrost termination thermostat. The heater is located directly under the cooling coils in the freezer. The termination thermostat is a silver round disk clipped to the top of the same cooling coils, and the timer in located in the control panel in the fresh food section.

Apr 02, 2016 | GE Refrigerators

1 Answer

Freezer works but fridge does not


Lets see if the defrost timer being turned clockwise slowly will force defrost and cause things to get colder. On page 5 of the (click HERE=>ET4WSKXKQ02 Parts Manual ) you will see location 4? That is the 2188371 Defrost Timer
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inside the fresh food com[partment at the top and behind the control panel will be the 2188371 Defrost Timer If forcing defrost solves the cooling problem then just replace the 2188371 Defrost Timer and if not we will need to check the 2176942 Defrost Heater Assembly and the 2192096 Defrost Thermostat Don't buy ba defrost thermostat until we discuss a different way of getting one to work should you need one (last resort because of cost) My focus is defrost timer and defrost heater at this point you will not need all the wires on the defrost thermostat should you need one just splice a simple defrost thermostat into the wiring harness. Below is a short movie on testing the defrost heater or click HERE Talk with me and we will get this refrigerator working, Sea Breeze
Refrigerator Defrost Heater Test
Refrigerator Defrost Thermostat Test


Apr 01, 2013 | Whirlpool Refrigerators

1 Answer

Freezer is cold, but cold air is not circulating in refrigerator


Check freezer fan is working.If ice formed over freezer fan by working. It's a common problem due to irregular defrosting. Keep freezer setting temp at 5 degree. And check defrost timer, thermostat,heater are working properly.
Turn timer with small tip screw driver to shut off fridge. If not shut off, replace timer. Turn counter clockwise defrost thermostat. If fridge not shuts off replace defrost thermostat.Check heater by join the 2 wires in the defrost thermostat. And after 1 minute, unplug power and keep your arm on heater. If it's warm heater is o.k. Otherwise, replace heater.
Once heater starts work at regular interval controlled by thermostat and timer, defrost will be good and effective cooling will also be in fridge compartment.

Jan 24, 2011 | Amana ABB2524DE Bottom Freezer...

1 Answer

Refrigerator is not cooling


Good day,
You will need an ohm meter to check the parts.
Your defrost system has failed.
It is made up of 3 components, 2 of which are located behind the rear panel in the freezer compartment.
Remove the rear panel. There is a cooling coil, that has a calrod heating element that runs along it's bottom. As well there is a defrost thermostat ( a small round 1" disk) which is located on the top of the same coil. Both should be checked with an ohm meter to test for continuity. The heater should read no more than 30 ohms, the thermostat ( IT MUST STILL BE COLD BELOW 30 DEGREES) should read zero ohms. Note: The heater rarely fails, the thermostat has a high failure rate.

The third item is a timer, or a solid state adaptive defrost control. Depending on age, and model, it is located , behind the kick plate on the bottom front.
Or, in the fresh food compartment on the roof.
If it is a timer, you can turn the timer shaft when the machine is running until the machine shuts off. With it still turned on, wait 40 minutes.
If the machine turns itself back on, the timer is O.K. if not, the timer is bad, and needs replaced.
If the Main heater checks O.K. and it has a solid state control, then replace the thermostat in the freezer compartment, and the solid state board.

Below is an excellant tutorial on defrost systems.

http://www.appliance411.com/faq/howdefrostworks.shtml
Thank you for using FixYa

Jan 20, 2010 | Nor-Lake Freezer Norlake Refrigeration 6'...

1 Answer

Frigidaire FRS222GEWO--Fridge not cooling/Freezer works fine.Coil clean,fan that blows over coil working


Good day,
The defrost system is the most common problem. If you see frost on the rear panel in the freezer compartment.............then proceed.
The defrost system, is made up of 3 parts. 1.The timer, which is located either behind the kick plate (grille) on the left side, or in the fresh food campartment in the top right where the thermostat is located.
2.The defrost thermostat (by far the most common failure) which is located behind the rear panel in the freezer on top of the evaporator coil (it's a small round disk with 2 wires connected to it) and lastly.......
3.The main heater, which is located behind the rear panel in the freezer. It is a calrod unit, and wraps around the bottom of the coil, and up both sides.

With the machine running in this condition, with a screw driver, turn the shaft of the timer clockwise until the machine turns off. Leave as is. Wait 40 minutes.
If the machine turns back on, the timer is O.K. If not, replace the timer.
If the timer checks O.K., remove the back panel of the freezer and replace the defrost thermostat.
The main heater remains suspect, but I've never seen one go bad.
Your not done.
Once the repairs are complete, you must unplug the machine for 6 to 8 hours, ideally with a floor fan blowing in the freezer compartment.
Patience is your friend here. Do not rush the manual defrosting part. It's the only proper way to get all the ice melted out, and dry the compartment properly.

Here is a generic picture of how defrost systems work.
If the hyperlink does not work, copy and paste it into the address bar of your browser.

http://www.appliance411.com/faq/howdefrostworks.shtml

Dec 11, 2009 | Refrigerators

1 Answer

Oklahoma Freezer cold fridge warm fan gets Ice build up !


You should not have to manually defrost. Your auto defrost system is not working. Check the timer usuall in the frig compartment near the thermostat ( a small hole, use a screwdrive flat tip 1/4" to rotate the timer till it clicks starting the defrost cycle) check freezer in 10-15 min should be defrosted if not you will need to check the heater and thermostat located behind the rear or bottom panel of the freezer.

The defrost timer could be under the box in the front behind kick panel or in the rear by the compressor.

Sep 22, 2009 | Haier HTE18WAA Top Freezer Refrigerator

1 Answer

Subzero 590: small upper fan inside the refrigerator not working


The fan circulates the cold air accross the evaporator to distribute the cold air around the fridge. It appears that your defrost system isn't working since you have ice buildup. You have a defrost heater and defrost thermostat and timer or motherboard which need to be checked to determine the problem. 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 31, 2009 | Sub-Zero 690 Side by Side Refrigerator

1 Answer

Freezer working fridge not


There are screws around the edge to remove it. It's probably iced up due to defrost system failure. 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 25, 2009 | Zanussi ZX99 / 5 Bottom Freezer...

1 Answer

GE Fridge not cooling well, frost in freezer,back wall and coils


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 17, 2009 | Refrigerators

1 Answer

Freezer works fridge does not on a GE GSS22QGMC BB


you need to take freezer evaperator cover off , then turn it to defrost and test the supply voltage across the defrost element. if no volts then test the round disk looking thing with 2 wirers comming out of it . with the supply power removed from the power point, the coil frozen up , disconnect these wirers and use a continuity checker such as a multy meter on diode check or buzzer mode, you should have a closed circuit through the defrost termination thermostat (round disk with 2 wirers) , it is in series with the defrost element thus cutting the power to the element if the coil temp gets too high and terminates the element , the timer will time out after it's time duration is reached. A good way to test the motor in the timer is to put a texta mark on the dial of the timer and check it in 1/2 hr, to see if it has moved.AFTER YOU HAVE PUT THE ELECTRICAL CONNECTIONS BACK AFTER TESTING THE TERMINATIN THERMOSTAT AND MADE IT SAFE, YOU WOULD PLUG IT BACK IN.
The defrost timer needs to be connected to power of the fridge to opperate.
regards
****. let me know your progress pls.

Mar 31, 2009 | GE Refrigerators

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