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Westinghouse refrigerator RS643T defrost thermistor

Defrost element is Ok Defrost cycle not working.

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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

  • 1314 Answers

SOURCE: Auto defrost not working

a manual defrost will help in the sense that it will healp save your food now if you dont mind spending a little cash may i suggest you go buy a eurika 350 hand held steamer its great for defrosting and about 1000 other thuings around your house you canget it at lowes places like that after defrosting the unit will freeze again in about two to three days depending on how many times you open your door reply to this thered with the appox age of your unit and i can better advise from there some times as in the case of a stuck theroma stat if seen it fix them but i wouldnt count on it hold my rating tii we are done

Posted on Jan 19, 2008


SOURCE: Samsung RS2556 refrigerator

To solve this problem change both difrost heater and control board on your frige.
remember to buy those parts you need have both modle and serrial number handy.

good luck


Posted on May 20, 2008

  • 1606 Answers

SOURCE: I have a Hotpoint HSS25IFMD WW sise by side

A thermistor is a 2" torpedo looking piece with 2 wires attached to it . The defrost bimetal , a 1" round aluminum piece , snapped onto the coils , with 2 wires , should be replaced when replaceing the heater . This bimetal could be the problem . To test the defrost system , remove the main control board cover . The blue plug with 3 wires to it needs to be connected . Looking at the plug , the wireing will look like this : l l l . Lets call the terminals 1 2 3 . Useing a piece of insulated wire with both ends stripped , insert one end into terminal 2 and the other end into terminal 3 . The heater will come on if both the heater AND bimetal are good . If you put a new heater in and it wont come on , and you do this test , then the bimetal has to be bad . If your terminology is correct , you have 2 thermisters in the freezer . One on top of the coils ( evaporator sensor ) and one at the bottom by the drain pan ( freezer temp sensor ) . Wouldn't hurt to replace both if you replaced one .

Posted on Aug 08, 2009

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SOURCE: How long is the defrost cycle?

Normal cycle is 28 - 32 minutes .

Posted on Sep 19, 2009

Testimonial: "Thanks, very helpful!"

Sea Breeze
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SOURCE: Freezer fan in my GE side by side refrigerator surges and whistle

With you model and brand I would want to check the voltage on the fan and shaft play. Meaning the fan may be going bad or the voltage being altered at the motherboard. I do know your model with the control board that it has if a fan becomes defective the board is also affected. If the fan goes bad and replaced it is very possible that the board will fail and cause the new fan to fail. If you need help with diagnostics please let me know, Thanks, Sea breeze

Posted on Dec 13, 2009

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1 Answer

Where do I find the defrost timer and main thermostat in a Westinghouse Virtuoso RS643T side by side fridge?

Go to and enter RS643T. With luck, you will be presented with a list of common replacement parts and may be able to view a generic disassembly video showing parts location.

Dec 14, 2017 | Westinghouse Refrigerators

1 Answer

My ge pfs22s1sss is not defrosting, tested temp sensor, heating element,both ok. Evaporator thermistor tested bad, now compressor will not run

You could have a bad control board. These are notorious for going bad. I had the same issue just the other day. I replaced the control board because the compressor wasn't coming on and the defrost thermistor was also bad causing no defrost. Remove the control board and see if there are any burned spots on the back of the board.

Jul 30, 2014 | GE Profile Stainless Bottom-Freezer...

1 Answer

Fisher and Paykell E522B icing

The thermistor sets the defrost cycle. Always go with the cheapest solution first but also ohm out your heater that could be the issue also.

Apr 13, 2013 | Fisher and Paykel Active Smart E522B...

1 Answer

Freezer has thawed twice in the last 2 weeks

Hi and welcome to FixYa, I am Kelly. This can be caused by several things but usually when it thaws on a routine basis the automatic defrost bi metal thermostat has failed. Using this model number PSS26MSRCSS and this diagram:
The failed part would be item 240. It is possible however that the thermistor Item 241 could also cause this symtom.

Make sure to read the information about the Defrost thermostat using the link below. Just note that a defrost thermostat will have continuity anytime the temperature is below 60 deg F.

GE Thermistor testing can be found here:

These are the 2 most common reasons that the a refrigerator will thaw out on a regular basis. Now there can be things like a problem with the PTC relay or thermal overload on the compressor in the form of loose / hot terminals or a bad relay / overload assy. Lastly and repair of last resort the compressor can be dragging and not starting properly or the rotor occasionally locks.
I believe that if you change out the thermistor and bi-metal thermostat that your defrosting probelm will cease. We usually change them both at the same time because the control board is electronic and under nomal conditions the thermistor controls the defrost cycle. The Bi-metal thermostat is there as a back up to terminate the defrost cycle when the temp at the top of the evaporator reaches 60 Deg F and at that time cycles the compressor to start.

Having said all that... if the defrost heater Item 230 of the first link is not heating up at all; the unit will defrost / thaw to 60 deg F every defrost cycle. Most of them will have Blue and orange wires on them and you read resistance at each end of the glass tube on the terminals. No resistance = an open / failed element.

Thanks for choosing FixYa,

Mar 02, 2011 | GE (PSS26MSRSS) Side by Side Refrigerator

1 Answer

GE Model GSS25JFMWW, started with the ice maker not working, then the water doesn't work half the time. Now the freezer and Fridge both stop working, and out of nowhere the will start again after a couple...

Hi and welcome to FixYa, I am Kelly

The ice-maker not working was a sign that the freezer temps were rising above 14 - 16 deg F. There ice-maker has an internal thermostat that activates the harvest cycle when the temps reach around 15 deg F. If the freezer is warming up it will never make ice.

What is most likely causing the recent symptoms of the unit shutting of and not stating for a long period is either an intermittent defrost thermostat (
The unit has a timed defrost cycle to START the cycle but there is a 60 deg F thermostat that opens to terminate the defrost cycle. If the defrost heater does not work the unit has to slowly warm up toward room temp without heat to reach 60 deg F for the defrost cycle to terminate. This can take a very long time if the freezer is more than 50% full as the contents will keep the temp below 60 deg F for an extended period.

I suspect you have a defrost element failure. Item 230 this link:

You should read resistance across the defrost heating element. No resistance = open element.

There is the very very remote possibility that there is a problem with the main board. Item 801 this link:
Since the unit works once defrosted I doubt the main board has failed.

There is a thermistor that is item 241 of this link: that can possibly cause the problem.

Thermistor Image:

If the defrost heating element is good then this would be suspect #2.

I hate to use someone elses material in a response but this one is so good that it is a must read:

Bottom line... I still think you have a defrost heating element problem at this time.

Thanks for choosing FixYa,


Jan 27, 2011 | GE GSS25JF Side by Side Refrigerator

1 Answer

I heard a hissing while I was looking in the refrigerator, and I realized that it was coming from the freezer. I looked in the back of the freezer compartment, and I saw a red coil through the vents at the...

Hi and welcome to FixYa. I am Kelly. Relax :) You just witnessed part of the NORMAL automatic defrost cycle. There is a heating element in a glass tube that melts ice off of the evaporator until either a thermistor or 60 Deg F defrost thermostat cycle and terminate the defrost cycle. Just so you know automatic defrosting cycle intervals are anywhere from every 6 hours up to 16 hours and 35 minutes depending on the model. The hissing sound you heard was melting ice dripping on to the hot glass tube of the heating element so the water was boiling on the glass tube. It is nothing to worry about unless the defrost cycle never terminates. (i.e the unit never starts back up)

Thanks for choosing FixYa,


Nov 15, 2010 | Refrigerators

1 Answer

Appears to go into an extended defrost cycle.

Sounds like your freezer has a bad defrost thermostat ( bimetal ) or bad #4 and/or #5 thermistor . This bimetal , has a high temp rating of 140 degrees , which means , when it gets to 140 behind the panel , it will cut off the defrost heater , to keep ice and food from thawing . The thermistors , tell the main control board the temps , and it decides when to restart the cooling process . I would check the thermistors by the digital controls , in the test mode , or have a technician check them for you .

Sep 12, 2009 | GE Refrigerators

1 Answer

I have a GE side by side refrigerator that keeps blowing the defrost heater element. MODEL # TFT22JWDA WW SERIAL # TZ264141 I bought it from a GE dealer about 5-6 years ago. It ran fine for 3 years,...

In my GE side-by-side there is a defrost temp sensor located near the top of the evaporator coil. I think the control board uses that temp sensor to know when it should be done defrosting.

On the schematic of my fridge (link below), the defrost thermistor is part number 240 in the diagram (not part number 241, which is a different temp sensor located adjacent to the one you want)

I don't know why the defrost element would fail immediately other than incorrect supply voltage or just a bad defrost element.

Jul 28, 2009 | Refrigerators

1 Answer

Top half fridge not cold freezer department fine

I had the same problem; the top fridge compartment was warming up to 14C while the freezer compartment was starting to defrost (frozen stuff was starting to become soft. I took the rear wall off the freezer compartment and found it all iced up. I defrosted it with a blower heater then powered it back up. It all worked fine for a month when the same thing happened. I figured that the defrost cycle wasn't working. I located the defrost timer on the rear right-side of the fridge. I rotated it several times and found that the fridge was turning on and off. I rotated it until the fridge turned off. I waited 5 minutes then stuck my head into the freezer compartment and felt the rear wall at the bottom where he drain is; it felt warm so I guessed the defrost heater element was ok. I ordered a defrost timer and installed it. I haven't had a problem since.

Nov 09, 2008 | Westinghouse Refrigerators

1 Answer

Is the Defrost Heating Element Defective?

no not at all, it it was bad wouldnt glow at all. and the fact its glowing tells me yes timer and thermo are good.doesnt sound like your having a defrost problem at all

Mar 04, 2008 | Frigidaire FRS3R5EMB Side by Side...

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