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How do you check a defrost thermostat on a - Refrigerators

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Defrost t'stats are normally open, at room temp., and each one has a different temp. that it closes at.(it will be on the t'stat) Typically try getting access to another freezer put it in a cup of water, place it in the freezer, when it reaches it's closing temp. you should have continuity. if you don't then the t'stat is bad.

Posted on Oct 26, 2012

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My RCA side by side refrigerator not defrosting, evaporator iced over, how do I troubleshoot


There are three components in a defrost circuit. The defrost timer or control, the defrost thermostat and the defrost heater. It is common for the defrost thermostat to go bad and not allow power to the defrost heater. You will have to remove the back panel and test the defrost heater and thermostat if the heater checks Ok with a ohm meter then it could be the defrost thermostat. This is usually a small round about an 1" in diameter part that clips to the top section of the freezer coils. This must be tested when it is cold. If both of those check OK them you have a bad defrost timer or control.

May 03, 2015 | Refrigerators

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Can I check the defrost thermostat without cutting the wires from the harness connector on the heater unit?


If this is a button type thermostat, it should read 0 ohms and when it hits the temperature marked on it, it will open and stop power to the defroster. If your defrost is not coming on , or will not stop defrosting, this is a probable culprit.

Jun 04, 2014 | Hotpoint Refrigerators

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I have an Amana ARB8057CSR that has stopped cooling. I have replaced the capacitor and overload relay on the compressor as well as the defrost thermostat and eliment. When plugged in it sounds like th


Part of your message was missing but I do see that you did not mention the defrost thermostat=> 12001937 Defrost Thermostat
Chec for any loose wire or burned electrical connections and remember that the defrost thermostat is designed to be on while below freezing temperatures and once the temperaytures reach 50 degrees F the contacts in the defrost thermostat open to prevent the freezer from getting stuck in the defrost cycle for too long and also is a safety feature. Test the defrost thermostat with a OHM Meter while freezing.. Ask if you need I will be here to answer any questions you may have, rate if helpful and please ask if you need more answers, Thanks John Tripp/ AKA Sea Breeze

Possible Causes

Symtoms: Frost or ice on evaporator

1. Defrost thermostat faulty->Check defrost thermostat. Replace if failed.

2. Evaporator fan faulty ->Check fan motor. Replace if failed.

3. Defrost control faulty ->Check control and replace if failed.

4. Defrost heater remains open -> Check defrost heater continuity.Replace if failed.

5. Open wire or connector -> Check wiring and connections. Repair as necessary

6. Refrigerant shortage or restriction -> Refrigerant shortage or restriction. This will look very differen that a totally frosted over evaporator. Click here for what that looks like=> Lack of Freon

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Nov 09, 2011 | Amana ARB8057CSR Bottom Freezer...

1 Answer

Freezer is not defrosting properly , I already change the thermostat, my refigerator model is TBX74UL01 OR TBX74UB01.


If the thermostat is replaced, but still its not defrosting, then two possibilities, either weak defrost heater,Heater is the part which heats and it defrosts, if the heater gets weak, then unit will not defrost properly.And it will take more time to defrost, and till that time, again frost gets collected.---------- But if defrost heater is ok, then problem is defrost board.The defrost board is the part, which controls both thermostat and defrost heater.-----------
This problem is called defrost problem.-------------

So first thing you try is , perform, manual defrost reset procedure.---------

The manual defrost reset procedure is as follows : ----
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. Then check,if same frost is getting collected, then its defrost problem,. If it's again building up ice that means the unit is not defrosting. It's starting the cooling procedure, and then while defrosting, it's not working. 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. IN YOUR case, defrost thermostat is already got replaced, so ignore thermostat, but other two possibilities needs to be checked.----------You can get required parts from from online sites like: --- www.repairclinic.com or from searspartsdirect online site. --------- This should help.Thanks.Helpmech.

Sep 19, 2011 | GE Refrigerators

1 Answer

The cooling coil in the back of the freezer frosts up and needs to be manually defrosted nearly ever 2 weeks. The timer seems to cycle properly and the compressor cycles properly but the defrost cycle...


The ohms of the defrost heaters vary, but all you really need to do is check it for continuity. If its open, its bad. The defrost thermostat must be closed for defrost to happen,it is in series with the heater the defrost thermostat opens to terminate defrost, then the timer puts the unit back in run mode.
To check the defrost thermostat you have to put in in a freezer for a while then check for continuity . The actual open and close temps are usually stamped right on the defrost thermostat Its considered good practice to replace both the heater and the defrost thermostat while you are in there

Jun 28, 2011 | Refrigerators

1 Answer

Lack of cooling in the lower section


It can be defrost issue.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

The fridge is freezing all food contents even when on factory setting 6. How do I resolve this?


It's common problem. You have to check Defrost timer, thermostat and defrost heater. Any one malfunction, you will get over frosting. How to check?
First, locate the defrost timer which may hidden behindcorners of the fridge at the back bottom, in some models located in the ceilingof the fresh food section or behind the cold control cover. Once you locate thedefrost timer, slowly turn the screw in the middle of the defrost timer withstraight screwdriver until the fridge shuts off. Now it's in defrost. If thedefrost heater(s) starts, replace the defrost timer and defrost thermostat. Ifthe heater(s) does not start, unplug wire cord to check ohm test for continuityof heater. If continuity is there, plug cord wire which gives power 120volts(check specification) to heater. If heater no starts, bypass defrost thermostatby join the 2 wires in the defrost thermostat. If the heater now comes on,replace the defrost timer and defrost thermostat. If the heater itself is bad,replace it. Thanks and hope helpful.

Feb 02, 2011 | Hotpoint FFA90 Bottom Freezer Refrigerator

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

After 1 or 2 weeks the refrigerator stops working, it freezes up. After defrosting, works perfect for 1 to 2 weeks again


Defrost heater bad, defrost thermostat bad or Defrost timer. Defrost heater and Thermostat can be continuity checked. Defrost thermostat can only be checked if at freezer temperature. Both should show continuity if good. If those two test good the process of elimination means it's the defrost timer. Always unplug refrig when performing these checks

Aug 22, 2009 | Avanti FF511W Top Freezer Refrigerator

1 Answer

Bottom freezer icing up


there is an issue with your defrost. either your bi-metal thermostat, your defrost heater or your defrost timer/control are bad. you can check the thermostat and the defrost heater with an ohm meter on tone. they are both located behind the back panel in the freezer. ( Note: do not thaw freezer until thermostat has been checked, otherwise it will test bad due to warm temp ). if both thermostat and heater have tone, then the defrost timer/control is bad. Joe

Nov 18, 2008 | Amana Refrigerators

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