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How do I test the defrost thermostat?

Defrost thermostat is in freezer comp. Defrost function is inop.

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Defrost thermostat is a temp control. To test it, it would need to be in ice water. When cold it is a closed switch or contacts (checked with a multimeter. When it gets above 50--55 degrees it will open the contacts. Another way, unplug refrigerator----safely hook a jumper wire across the thermostat leads by passing the thermostat and then put the refrigerator in defrost. If heater comes on the thermostat is probably bad. If still no defrost--- you may have burned out heaters. Once done testing this way make sure you remove jumper and tape all wires for a safe connection.

Posted on May 01, 2015

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Posted on Jan 02, 2017

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Refrigerator 58 degrees


From what you said, your defrost circuit is not function correctly. The defrost circuit is made up of the defrost heater, defrost thermostat and defrost timer. The heater and thermostat are located close to the evaporator coils in the freezer section and depending on the age of your refrigerator the defrost timer is either in the fresh food side close to the temperature knobs or part of the control board.
You can check the heater and thermostat with an ohm meter and you should get a reading of 10-100 ohms for either of them. The timer can't be checked without special test equipment so you will need to check the other two and rule them out first.NOTE: If you manual defrost the freezer by unplugging and then using a hair dryer or heat gun, the refrigerator should work normally for about two weeks IF it is the defrost circuit!

Jan 02, 2012 | Kenmore Side by Side Refrigerator

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HOW DO YOU PUT REFRIG IN DEFROST MODE WHEN IT HAS ELECTRONIC DEFROST CONTROLLER


You didnt give the make of the ref.; But your solution is here for most all

The newest defrost feature in modern fridges is the electronic adaptive defrost control board. *Maytag has one version, see picture...to put this adaptive defrost style of fridge into defrost, short with a small screwdriver between L1 and test on the adaptive defrost board, wait 3 seconds and you should hear a "click" noise from the relay and the fridge will shut off and go through a defrost cycle. A close up common way *this* version of the Maytag/JennAir control is wired.
Amana also has a version of adaptive defrost, see info sheet for some help on the Amana version. Press refrigerator light switch five times in six seconds to initiate defrost cycle. Pressing five more times within six seconds will cancel defrost and go straight into the run mode. Similar operation on both bottom mount and SxS refrigerators. After the defrost terminator/thermostat opens, six minutes of dwell time occurs before the compressor and condenser fan motor will operate. After defrost terminator/thermostat open, 10 minutes of dwell time occurs before the evaporator fan motor will operate.
Frigidaire has also jumped into the market with an adaptive defrost board. The fresh food section light switch and light bulb must work. To initiate a defrost cycle, open the door and push the light switch in and out 5 times within 6 seconds. The compressor and fans should shut off and the defrost heater should come on. Open the door and push the light switch in and out 5 times within 6 seconds to remove the refrigerator from the defrost mode and back into a cooling mode.
Frigidaire - referance model FSC23F7DSB3
This product comes equipped with an Adaptive Defrost Control (ADC). To activate manual defrost, press and hold the Freezer temperature UP (WARMER) key while pressing the Fresh Food temperature DOWN (COLDER) key 5 times within 6 seconds. A ?¿½d?¿½ in the freezer temperature window and ?¿½F?¿½ in the refrigerator temperature window will display when the heater is activated. To deactivate manual defrost, press and hold Freezer temperature UP (WARMER) key while pressing the Fresh Food temperature DOWN (COLDER) key 5 times within 6 seconds. ?¿½d?¿½ and ?¿½F?¿½ will be displayed until the defrost cycle is complete. (approx. 8 minutes)
For some Whirlpool refrigerators - some Kenmore refrigerators are made by Whirlpool ( 106.######## )
The refrigerator/freezer defrost system can be checked by manually initiating a defrost cycle. There
are two methods of initiating the ADC Test Mode.
First Test Method:
1. Turn the thermostat off for 15 seconds.
2. Turn the thermostat on for 5 seconds.
3. Turn the thermostat off for 15 seconds.
4. Turn the thermostat on for 5 seconds.
5. Turn the thermostat off for 15 seconds.
6. Turn the thermostat on for 5 seconds.
7. Turn the thermostat off.
In 3 to 8 seconds the ADC should turn on the defrost heater (with the bimetal closed). NOTE: The test mode will terminate when the bimetal opens. If the refrigerator/freezer is already in defrost, Test Mode can be terminated by unplugging the refrigerator/freezer from the wall outlet and waiting 30 seconds before plugging it back in. The refrigerator/freezer should immediately go into cooling mode if the thermostat is closed.
If this first test procedure fails to make the ADC initiate a defrost cycle, try the following procedure to make the ADC begin the Test Mode.
Second Test Method:
1. Disconnect the refrigerator/freezer from the wall outlet for at least 30 seconds.
2. Turn the thermostat off.
3. Reconnect power to the refrigerator/freezer.
Within 3 to 8 seconds the ADC should turn on the defrost heater (with the bimetal close). If the unit fails to go into the defrost mode during this test, the problem may not be with the ADC. A defective bimetal may be the cause of the failure. The ADC will only go into a test mode if the bimetal
is closed. If the ADC senses an open bimetal it will return to the cooling mode within 3 to 8 seconds.
HELPFUL HINT: Upon entering the Test Mode, the relay mounted on the ADC board should turn off the compressor and turn on the defrost heater. Listen for the relay to click.
?¿½ If the relay clicks one time when entering the Test Mode, check for continuity in the defrost heater.
?¿½ If the relay clicks two times, check for an open bimetal.

Maytag S-S Refrigerator MSD2756GEW forcing defrost cycle
I replaced my defrost heater two weeks ago, but the frost built back up on the evaporator coils. Replaced the adaptive defrost board with new ( Maytag p/n 6100598 8 ) board. Want to force a defrost cycle to see the heater work, so I shorted the L1 pin to adjacent pin (now called DOOR instead of TEST) for three seconds and nothing happens. Compressor keeps running, fans still going etc. Tried pressing the door switches 5 times in 6 seconds and that doesn't work either. Any hints on how to get the defrost cycle to initiate?
Hi,
This might help, a copy:
The issue is that some 12002104 ADC boards have been shipped in the 61005988 ADC board box. Do not reorder the board, the 12002104 board will function the same in place of the 61005988, but you must use the forced defrost method for the 12002104. Jumping "L-1" and "door" will not initiate the forced defrost function.
To Initiate Forced Defrost Cycle:
Cycle cold control on and off three times in six seconds. The cold control needs to be left in the closed (call for cooling) position for the defrost system to energize on all platforms. It is not enough to cycle the cold control knob, the contacts must actually open and close (open doors for a period of time if necessary to force the control to call for cooling). In most cases, you can hear the contacts open and close if they are doing so.
To Terminate Forced Defrost Cycle:
Disconnect power for five seconds.
You were right. I cycled the cooling controls three times and it went into a defrost cycle. Thanks.

Aug 08, 2011 | Refrigerators

1 Answer

Kenmore Elite Bottom freezer is causing all kinds of problems. From the start we have had problems with the ice maker not freezing the ice fast enough and overflowing into the slides causing issues with...


Hello, ok lets start with the ice and frost all over the freezer compartment. This is mainly due to your unit haveing a defrost issue. If you were to remove the rear panel on the inside rear of the freezer by unscrewing the screws that hold in the panel you would then gain access to the evaporator coil. There are three key parts that make the defrost function work properly the defrost thermostat, the defrost heater, and the defrost timer or on some units instead of a defrost timer they have a control board located behind a panel in the rear of the machine. The defrost thermostat is usually the first place you would start diagnosing your defrost issue. Also when you remove the rear panel and gain access to the evaporator coil if you found any ice build up on the evaporator you would then defrost any ice with a hair dryer and also assure that the drain hole below the evaporator is clear of ice as well as any obstruction as well. The defrost thermostat is a small round disc like part that has two wires going to usually found on one of the compressor copper lines, the defrost heater is the element looking metal piece that is usually found below the evaporator coil itself. Both of these pieces can be tested for continuity using a multimeter to assure if they are functioning properly. Most of the time it is thhe defrost thermostat that fails that does cause this issue. So first test these two key parts and message me back with your finds. If both of these parts test as working properly I will then further instruct on how to test the remaining parts. Thanks again I look forward to your reply
Rick

Jul 17, 2011 | Kenmore Elite 22.4 cu. ft. Bottom Freezer...

1 Answer

Freezer works refrigerator is warm


If the freezer is getting cold and working properly, but fridge section is not getting cold, then it can be defrost issue.------------------ The procedure of this unit is as follows: --- The compressor starts then it cools the freezer section. When the freezer reaches its cooling level the defrost cycle starts functioning. In this cycle the fan in the freezer section starts running and the cool air in the freezer section is passed to the fridge section and the fridge section gets cold. The air from freezer to refrigerator passes from the section, in that section the damper is located.--------- Try manual defrost reset procedure: ---- First unplug the unit from main power outlet. Then empty whole unit completely. Then keep both the doors open. Wait for 24 hours. All the ice collected on the coils and in the freezer section will get melted. Clean the water from the sections. Then Connect the power cord of the unit to main power outlet after 24 hours/.Then set the temperature to normal in both fridge and freezer section. It will take near to 4 hours to get run in its proper cooling cycle. Then check, if the problem returns again. If the same problem occurs then it's defrost problem. The defrost board and the defrost thermostat/heater is not functioning properly and it has to be checked and replaced. The defrost assembly consists of three main parts. The defrost thermostat, the defrost heater and defrost board. Any of the one is not functioning. When thermostat sense the maximum cooling, it triggers the defrost heater to start heating and this defrosts the ice collected on the coils and the system works. Both thermostat and heater are controlled by defrost board. First the thermostat and defrost heater to be checked, if both check ok by meter and visually, then its defrost board causing the problem. You can get required parts from online sites like: --- www.repairclinic.com or from searspartsdirect online site.This should help.Thanks.Helpmech.

Apr 28, 2011 | Amana Easy Reach 20.5 cu. ft. Bottom...

1 Answer

THe fridge on our fridge freezer isnt working


If the freezer is getting cold and working properly, but freezer is not the it can be defrost issue.------------------ The procedure of this unit is as follows: --- The compressor starts then it cools the freezer section. When the freezer reaches its cooling level the defrost cycle starts functioning. In this cycle the fan in the freezer section starts running and the cool air in the freezer section is passed to the fridge section and the fridge section gets cold. The air from freezer to refrigerator passes from the section, in that section the damper is located.--------- Try manual defrost reset procedure: ----
First unplug the unit from main power outlet. Then empty whole unit completely. Then keep both the doors open. Wait for 24 hours. All the ice collected on the coils and in the freezer section will get melted. Clean the water from the sections. Then Connect the power cord of the unit to main power outlet after 24 hours/.Then set the temperature to normal in both fridge and freezer section. It will take near to 4 hours to get run in its proper cooling cycle. Then check, if the problem returns again. If the same problem occurs then it's defrost problem. The defrost board and the defrost thermostat/heater is not functioning properly and it has to be checked and replaced. The defrost assembly consists of three main parts. The defrost thermostat, the defrost heater and defrost board. Any of the one is not functioning. When thermostat sense the maximum cooling, it triggers the defrost heater to start heating and this defrosts the ice collected on the coils and the system works. Both thermostat and heater are controlled by defrost board. First the thermostat and defrost heater to be checked, if both check ok by meter and visually, then its defrost board causing the problem. You can get required parts from online sites like: --- www.repairclinic.com or from searspartsdirect online site.This should help.Thanks.Helpmech.

Apr 27, 2011 | Refrigerators

1 Answer

We have a Kenmore Elite Freezer Model #253.29082994. We had the freezer plugged in and it was working fine. We unplugged it and moved it and now when we plug it in it won't start. Is there some kind of...


You refrigerator was made by Frigidaire Adaptive Defrost Controls Frigidaire Refrigerator Trouble Shooting and Diagnosing
On the initial plugin, or when power is restored to the fridge after a power outage:
If terminating thermostat is open, the fridge enters a compressor (cooling) cycle.
If the terminating thermostat is closed, the first defrost cycle occurs 1 hour
after initial plug-in.
Maximum defrost cycle time is 24 minutes.
Minimum time between defrost cycles is 6 hours. (compressor runtime)
Maximum normal clock time between defrost cycles is 12 hours.
Maximum time between defrost cycles (in "vacation" mode) is 72 hours.
Vacation mode is not entered unless the door has not been opened in at least 24 hours.
Note that the ADC will only enter the defrost mode if the terminating thermostat is closed. If the terminating thermostat is open when defrost is initiated, the ADC board will wait for six minutes and then return to the cooling mode.
ASSUMING that the fridge has been on and running,
and the terminating thermostat is closed,
defrost is initiated by pressing the door (light) switch
at least five times within six seconds.
The defrost heater should start heating up within 8 seconds.
If the above procedure caused the heater to heat up, the ADC board is probably bad; replace it.
If the defrost heater does not heat up, test the defrost heater, terminating thermostat and cold control for continuity as follows:
Unplug the fridge from the wall. Unplug the ADC board from its connector.
Test the connector for continuity between the following leads:
Defrost Heater = DEF TERM (blue) to DEF OUT (brown).
Terminating Thermostat = DEF TERM (blue) to NEUTRAL (lt blue).
Cold Control = COLD CONTROL (orange) to L1 (black).
Replace the defective component.

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Apr 26, 2011 | Kenmore Freezers

1 Answer

Kenmore refrig/freezer. freezer side is cold,


Check your condenser coil (should be below the refrig.). If dirty, you can clean it with a condenser brush from Home Depot or Lowe's. Turn the appliance off while cleaning. Be careful not to damage the refrigerant tubing (copper). If this doesn't solve the problem, then there may be an issue with the defrost thermostat, defrost heater(s) or the main temperature control assembly.

Contact an appliance service company.

Feb 17, 2010 | Kenmore Refrigerators

1 Answer

Freezer compartment thaws out


Hi and welcome to Fixya. Once the defrost cycle is started it deos not terminate until the 60 Deg. F thermostat closes and advances the defrost timer to start the compressor. If the 60 Deg F thermostat is not functioning correctly or intermittent the unit will continue in the defrost cycle by powering the defrost heating element. Essentially what it will do is act like a food defroster vs a freezer. This is not a difficult or expensive repair.

I would recommend that the defrost thermostat be tested for proper function. Personally I would just replace it and return the unit back to normal service.

Additionally it is possible that the defrost timer could be hanging or sticking in the defrost mode.

Should you call a technician to repair the unit I am sure he would recommend the replacement of both the Defrost timer and the 60 Deg F thermostat.

I would also recommend the same to you during in home repair service. Thanks again and hopefully you understand why it is performing as it currently is.

Feb 06, 2010 | Frigidaire Side By Side Refrigerator 26...

1 Answer

GE TBX18BLJ --Freezer comp frosts/ices up. Defrost


The next step would be to unplug the refrigerator and remove the rear panel and defrost so that you can unplug the defrost heater on one end and check the continuity. 305175 Defrost Heater and defrost thermostat Part number 3489. If you change the defrost heater you should also change the defrost thermostat. Let me know the results. Remember above 60 degrees the defrost thermostat will show open with your OHM meter. Sea Breeze

http://appliancepartsse.blogspot.com/

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Aug 15, 2009 | GE Refrigerators

2 Answers

Freezer works fine but fridge has lost its temperature.


The fridge gets its cold air from the freezer through a vent between the freezer and fridge.The fan in the freezer blows air through it. There is a flap you adjust with the fridge temp. control. Make sure it's opening and closing when you adjust the fridge temp

..
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.

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 02, 2009 | Refrigerators

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