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Defrost Thermostat, Sensor

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Defrost Sensor Assembly
Genuine Lg part
By: Lg
Part Number: 6615JB2005C

The Defrost Sensor Assembly is an OEM part for LG refrigerators. It plays a critical role in the defrost system by monitoring the temperature of the evaporator coil to ensure that it remains at the optimal temperature to prevent frost buildup. The sensor sends signals to the control board, triggering the defrost cycle when necessary.

Over time, the defrost sensor assembly can fail due to wear and tear, electrical issues, or exposure to moisture and temperature fluctuations. When the defrost sensor malfunctions, it can cause improper defrost cycles, leading to excessive frost buildup, reduced cooling efficiency, or the refrigerator not defrosting at all.

Symptoms of a bad defrost sensor assembly include:

  • Excessive frost buildup on the evaporator coils
  • Refrigerator or freezer not maintaining the correct temperature
  • Increased energy consumption
  • Refrigerator not defrosting properly

This OEM LG part is also compatible with Sears/Kenmore.

This part fixes the following symptoms
  • Frost buildup
  • Doesn't shut off
  • Fridge too warm
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Do-It-Yourself Stories from Customers like You LG refrigerator not cooling but freezer worked after viewing videos and talking to AppliancePartsPros, I ordered the parts   Robert C. • Flowery Branch , GA • November 30, 2019

I removed the defrost sensor assembly, installed a new one, it worked. Because of a shipping problem with FEDEX, Appliancepartspros resent the parts not once but twice. Needless to say, they are my go-to source for parts from now on. Read more

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Defrost Bimetal
Genuine Whirlpool part
By: Whirlpool
Part Number: WP4387490

The Defrost Bimetal is an OEM part for Whirlpool refrigerators. This crucial component functions as a safety thermostat in the freezer's defrost system. It is designed to monitor and control the temperature of the evaporator coils during the defrost cycle, preventing them from overheating. By cutting off the defrost heater when the coils reach a certain temperature, the bimetal helps maintain optimal functioning and efficiency of the refrigerator’s defrost system.

Symptoms of a failing defrost bimetal include:

  • Build-up of frost on the evaporator coils that does not melt during defrost cycles
  • Refrigerator or freezer section getting too warm
  • Continuous running of the refrigerator compressor

Causes of bimetal malfunction typically include corrosion, continuous exposure to extreme temperatures, and general wear over time, which can prevent it from responding accurately to temperature changes.

This OEM part is also compatible with Maytag, KitchenAid, Jenn-Air, Amana, Magic Chef, Admiral, Norge, Roper, and Kenmore models.

This part fixes the following symptoms
  • Freezer not defrosting
  • Fridge too warm
See more...
Do-It-Yourself Stories from Customers like You Fresh food section not cold freezer fine   Mike D. • Redwood City , CA • February 20, 2015

Defrost circuit was broken, defrost thermostat failed and allowed the frost to build up and clog the ports . Replaced defrost thermostat and fixed the circuit.....the heating element worked again as the defrost thermostat was broken in the open position, not allowing the heating element to operate. Read more

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Thermistor
Genuine Frigidaire part
By: Frigidaire
Part Number: 297110400

The Thermistor is an OEM replacement part for Frigidaire refrigerators. It senses and monitors interior temperatures, which allows the compressor and evaporator fan to operate efficiently based on temperature conditions. Proper thermistor function maintains consistent cooling and humidity levels. At room temperature, it should measure 5k ohms of resistance when testing with a multimeter.

Causes of a bad thermistor can include failure over time due to constant exposure to changes in temperature. Physical damage to the thermistor head or wiring connectors can lead to breakdowns in communication.

Symptoms of a bad thermistor include:

  • Fluctuating or unregulated interior temperatures
  • The refrigerator or freezer running constantly
  • Error codes or blinking lights denoting temperature control issues

This OEM replacement is also compatible with Electrolux, Gibson, Kelvinator, and Kenmore models.

Do-It-Yourself Stories from Customers like You No cooling from refrigerator lights worked but compressor did not run   Jeff B. • Ovalo , TX • May 07, 2015

Checked compressor windings - ok. Start relay looked no rattle or burning. Start capacitor seamed ok but hard to check. No 120VC to start relay at any time. Ordered thermistor, and electronic control unit. Figuring it was a bad thermistor not telling the ECU it was warm and to turn on the compressor. Or the ECU was damaged and was not sending the 120v to the compressor. Changed the thermistor first (cheapest part and as Appliance parts pros has a return policy I wanted to start there). ... Read more

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Thermistor
Genuine Frigidaire part
By: Frigidaire
Part Number: 297018400

The Thermistor is an OEM replacement part for Frigidaire Freezers. It is a temperature-sensitive electronic component located inside the freezer that helps monitor and regulate interior temperatures. 

Causes of a bad thermistor can include failure over time due to normal usage or moisture damage. Without proper monitoring, interior temperatures could fluctuate unpredictably.

Symptoms of a bad thermistor include: 

  • Inconsistent or inaccurate temperature readings  
  • Temperature control issues where the freezer is too warm or cold
  • The compressor and cooling system cycling on and off excessively
  • Frost or ice buildup in unexpected areas

This OEM Frigidaire part is also compatible with brands including Electrolux, Gibson, Kelvinator, and select Kenmore models.

Do-It-Yourself Stories from Customers like You High temp alarm was showing high but was really not   Steven B. • Plano , TX • January 02, 2015

Replaced the Thernistor and resolved the problem. Took less than 15 mins to do if you follow the instructions that they have on this site. Great video! Thanks Read more

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Defrost Thermostat
Genuine Ge part
By: Ge
Part Number: WR50X10010

The Defrost Thermostat is an OEM part for GE refrigerators. This component plays a crucial role in the defrost system by regulating the temperature within the freezer. It ensures the defrost heater activates when the temperature rises above a certain threshold, preventing ice build-up on the evaporator coils and maintaining efficient cooling.

Over time, the defrost thermostat can fail due to electrical issues, prolonged exposure to extreme temperatures, or wear and tear from regular use. When this part fails, it can lead to improper defrost cycles, causing ice accumulation and reducing the refrigerator's efficiency.

Symptoms of a bad defrost thermostat include:

  • Excessive frost buildup in the freezer
  • Inconsistent temperatures in the refrigerator and freezer compartments
  • Refrigerator running continuously or not running at all
  • Leaking water inside the fridge due to melted ice

This GE replacement part is also compatible with Hotpoint, RCA, and some Kenmore models.

Do-It-Yourself Stories from Customers like You Water leaking into fresh food compartment freezed frosted over   Charles L. • Frankfort , IL • July 18, 2016

This is a 15 yr old Kenmore (GE) refrigerator with top mounted freezer... I knew, for awhile, that I had a DEFROST problem. That was causing water to collect on the inside bottom of the fridge, under the veg./fruit bins. And then occasionally run out onto the kitchen floor if I didn't sop up the water inside. But I delayed the repair because of the hassle of emptying the food, top and bottom, and finding temporary homes for it all. Until I noticed 3 things happen in short order. 1)The water... Read more

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Defrost Thermostat
Genuine Frigidaire part
By: Frigidaire
Part Number: 5304521781

The Defrost Thermostat is an OEM part for Frigidaire refrigerators. It is responsible for monitoring freezer temperatures and initiating automatic defrost cycles when needed. Located inside the refrigerator's freezer compartment, the defrost thermostat plays a key role in the refrigerator's cooling and frost removal processes.

Symptoms of a bad defrost thermostat include:

  • Excessive frost or ice buildup inside the freezer  
  • Inability to maintain proper freezer temperatures
  • Freon leakage detected due to damaged components from prolonged frost buildup

Replacing the defrost thermostat with a genuine OEM part can help restore automatic defrost operation, prevent excess energy usage, maintain optimal temperatures, and avoid potential damage to contents from excessive frost accumulation. This Frigidaire replacement part is also compatible with Electrolux, Gibson, Kelvinator, and Kenmore models.
 

Do-It-Yourself Stories from Customers like You Ice buildup on rear panel and ice maker area.   Michael S. • Oran , MO • January 12, 2024

Replaced main board. The defrost heater and thermostat. Read more

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Defrost Thermostat
Genuine Ge part
By: Ge
Part Number: WR50X10025

The Defrost Thermostat is an OEM part for GE refrigerators. It plays a key role in the defrost system by monitoring the temperature of the evaporator coils and activating the defrost heater when necessary to prevent frost buildup. This part is equipped with one orange lead (4-3/4'') and a yellow lead (15-1/2''), with bare wire ends; but, wire connectors are not included.

Causes of a bad defrost thermostat can include electrical issues, wear and tear over time, or exposure to moisture. A malfunctioning defrost thermostat can result in excessive frost accumulation on the evaporator coils, leading to cooling issues and increased energy consumption.

Symptoms of a bad defrost thermostat include:

  • Excessive frost buildup in the freezer
  • The refrigerator or freezer not cooling properly
  • Increased energy usage
  • The defrost heater not activating during the defrost cycle

This GE replacement part is also compatible with Hotpoint, RCA, and some Kenmore models.

Do-It-Yourself Stories from Customers like You Fridgerator was too warm 60 deg f found that evaperator was freezing over not letting cool air into fridge   Christopher S. • St.Paul Park , MN • October 08, 2014

Well at first I thought the defroster element was the problem,so I was removing it to ohm it out and it broke upon removal.After replacing the element I was hoping that was the problem...After a week or so started having same problem with evap. freezing over.So I came back to your site to research what else could be the problem,and low and behold found an article about the defroster thermostat and a video on how to replace it.Ordered the thermostat and it was here within 2 days,replaced the... Read more

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Temperature Sensor Seal
Genuine Ge part
By: Ge
Part Number: WR02X10668

The Temperature Sensor Seal is an OEM part for GE refrigerators. This seal is designed to protect the temperature sensor from moisture and other environmental factors that could affect its accuracy and longevity. By providing a barrier against the harsh conditions within a refrigerator, such as humidity and temperature fluctuations, this seal ensures that the sensor can accurately monitor and control the refrigerator's internal temperature.

Causes of a malfunctioning Temperature Sensor Seal can include wear and tear over time, degrading the seal's effectiveness. Physical damage like tears or punctures can allow moisture to reach the sensor. Improper installation may leave gaps or loose areas around the sensor, compromising the seal.

Symptoms of a bad Temperature Sensor Seal include:

  • Inaccurate temperature readings.
  • Condensation or frost near the sensor location.
  • Frequent cycling or unusual patterns in the refrigerator's cooling process.

This OEM GE part is also compatible with Hotpoint, RCA, and some Kenmore models.

Do-It-Yourself Stories from Customers like You Fresh food side temp display says 37 degrees but inside ff side measures over 40 degrees.   John N. • Southlake , TX • February 03, 2018

This fridge has had a problem of ice building up around evaporator coil in fresh food side. Wife (she HATES this thing) says it's done this from day one; 10 years. GE guy says all these models do this and there's no fix for it, so we have clean out the ice periodically... Like the 1940s pre auto defrost. Now with the issue of FF side temp too highi assumed the ice had built up around FF evaporator coil preventing proper cooling, but AppliancePartsPros.com suggested the FF temp thermistor may... Read more

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Freezer Temperature Sensor
Genuine Lg part
By: Lg
Part Number: 6500JB2002T

The Freezer Temperature Sensor is an OEM part for LG refrigerators. This sensor monitors the temperature within the freezer compartment, sending readings to the refrigerator’s control board to maintain optimal temperature levels. It plays a crucial role in ensuring that the freezer operates efficiently and keeps food items properly frozen.

Over time, the temperature sensor can fail due to regular wear and tear, electrical issues, or exposure to extreme temperatures. A faulty sensor can lead to inaccurate temperature readings, affecting the freezer's performance.

Symptoms of a bad freezer temperature sensor include:

  • Inconsistent freezer temperatures
  • The freezer running continuously or not running at all
  • Frost buildup in the freezer compartment
  • The control board displaying error codes related to temperature

This OEM LG part is also compatible with Sears/Kenmore.

Do-It-Yourself Stories from Customers like You LG refrigerator not cooling but freezer worked after viewing videos and talking to AppliancePartsPros, I ordered the parts   Robert C. • Flowery Branch , GA • November 30, 2019

I removed the defrost sensor assembly, installed a new one, it worked. Because of a shipping problem with FEDEX, Appliancepartspros resent the parts not once but twice. Needless to say, they are my go-to source for parts from now on. Read more

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Bimetl-Def
Genuine Whirlpool part
By: Whirlpool
Part Number: WPW10392132

The Bimetal Defrost Thermostat is an OEM part for Whirlpool refrigerators. This thermostat plays a key role in the defrost system, helping to regulate the temperature within the freezer to prevent frost buildup on the evaporator coils. By activating the defrost heater, it ensures the coils remain ice-free and the refrigerator operates efficiently. The thermostat operates within a range of 20F (closing temperature) to 50F (opening temperature).

Causes of a bad defrost thermostat can include electrical faults, exposure to constant temperature fluctuations, or wear and tear over time. When the thermostat fails, it can result in frost accumulation, impacting the cooling efficiency.

Symptoms of a bad bimetal defrost thermostat include:

  • Frost buildup in the freezer
  • The refrigerator running continuously or not cycling properly
  • Inconsistent freezer temperatures
  • Water leaks inside the refrigerator

This OEM part is also compatible with Maytag, KitchenAid, Jenn-Air, Amana, Magic Chef, Admiral, Norge, Roper, and Kenmore models.

Do-It-Yourself Stories from Customers like You Repeating freezing of defrost drain.   Frank A. • Greenwood , IN • February 21, 2022

Fridge keept building up ice in defrost drain drain in freezer. Once the drain pan filled with ice it drips into fridge compartment. After taking things apart three times to thaw it out, decided to replace defrost components - heater and temperature switch. In addition to new parts, also added a 12 gauge copper wire hook that hangs from defrost heater into the defrost drain. After this, the defrost cycle is running as expected, but will not know if the issue is corrected until a year or so... Read more

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Defrost Thermostat (Refrigerator)
Genuine Whirlpool part
By: Whirlpool
Part Number: WP67004757

This refrigerator defrost thermostat senses evaporator temperature and controls power to the defrost heater. It melts frost when needed and shuts the heater off at a safe temperature to protect components and keep cooling performance steady.

  • Monitors coil temperature and opens/closes the defrost heater circuit
  • Terminates the defrost cycle at a safe cutoff to prevent overheating
  • Helps keep the evaporator clear of ice so air can circulate
  • Common symptoms: heavy frost on the freezer back wall/evaporator, warm refrigerator section, fan noise from ice, long run times with little or no defrosting
What's included: 1 defrost thermostat Install notes:
  • Disconnect power before service; use cut-resistant gloves
  • Access the evaporator behind the freezer rear panel and fully thaw any ice using heat-safe methods—never chip or pry
  • Reinstall the thermostat in the original location with firm metal-to-metal contact on the evaporator; route and secure wiring as originally
  • After reassembly, verify defrost operation and confirm unobstructed airflow

This part fixes the following symptoms
  • Freezer not defrosting
  • Freezer section too warm
See more...
Do-It-Yourself Stories from Customers like You Fridge not cooling freezer eval coil frosted over   Tom A. • Ridgecrest , CA • June 10, 2016

Ended up being the defrost sensor. Ordered the heater and control board just in case. Started with the control board still didn't defrost. replaced the sensor and all is well. Super helpful tech staff answered all my questions... Read more

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Defrost Thermostat
Genuine Whirlpool part
By: Whirlpool
Part Number: WP4387499

The Defrost Thermostat is an OEM part for Whirlpool refrigerators. The thermostat monitors the temperature of the evaporator coil and signals the defrost heater to turn on or off to prevent frost buildup, ensuring efficient cooling.

Causes of a bad defrost thermostat can include wear and tear over time, exposure to extreme temperatures, or electrical malfunctions.  

Symptoms of a bad defrost thermostat include:

  • Excessive frost buildup in the freezer
  • The refrigerator not maintaining the correct temperature
  • The defrost heater not activating
  • The refrigerator running continuously or not running at all

This OEM part is also compatible with Maytag, KitchenAid, Jenn-Air, Amana, Magic Chef, Admiral, Norge, Roper, and Kenmore models.

Do-It-Yourself Stories from Customers like You Well we did not know what the problem was at first! refridgerator was warming up   Michaela S. • Rochester , WA • June 06, 2015

Watched a few of your well put together videos and could not afford a new Refrigerator right now because it was a built in so decided with the frost on the bottom of the freezer grill and the Refrigerator warming up decided to replace the Heater Element and Thermostat Defrost which took some time but so far so good lets hope that is all that is needed saved over 10,000.00 dollars for a new 48" built in for now! Thank you for your rushed order and videos I think you are a life saver got the part... Read more

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Defrost Thermostat
Genuine Frigidaire part
By: Frigidaire
Part Number: 5303918810

This defrost thermostat controls power to the defrost heater by sensing the evaporator's temperature. Replacing a failed thermostat helps stop heavy frost build-up and supports consistent cooling and airflow in your refrigerator and freezer.

  • Monitors evaporator coil temperature during the defrost cycle
  • Opens to shut off the defrost heater at a safe temperature; closes again when cold to allow the next defrost
  • Failure symptoms can include heavy frost/ice on the back wall or evaporator
  • May lead to reduced airflow, poor cooling, or the fresh food section warming after several days
What's included: One defrost thermostat Install notes:
  • Disconnect power before servicing; wear cut-resistant gloves
  • Access by removing the freezer's rear panel to reach the evaporator area; defrost any heavy ice to avoid damage
  • Position the thermostat in the same spot on the evaporator tubing; ensure firm contact and route wiring as originally secured, away from sharp edges and the heater
  • Reassemble panels, restore power, and observe for proper defrosting over the next cycles

Do-It-Yourself Stories from Customers like You The icemaker not making ice.   David S. • Lawrenceville , GA • July 17, 2021

Got the infamous icemaker freezing up problem so common to Frigidaire Gallery and Professional series refrigerators. I was also only getting the "OP" code on the diagnostic test 26, so I determined the defrost heater and/or the thermostat was probably bad. So, I went ahead and replaced both of them, as well as installed the updated air handler housing kit. What I didn't realize from the parts pictures was that the air handler kit was not only updated foam replacements, but it was also a... Read more

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Defrost Thermostat
Genuine Whirlpool part
By: Whirlpool
Part Number: WP2321800

The Defrost Thermostat is an OEM part for Whirlpool refrigerators. This thermostat monitors the temperature of the evaporator coil and activates the defrost heater to melt any frost that has accumulated. This process ensures efficient cooling and prevents ice build-up in the freezer.

You should replace the defrost thermostat if it becomes faulty or damaged. Causes of a bad defrost thermostat can include regular wear and tear, electrical issues, or exposure to extreme temperatures that can lead to malfunctioning.

Symptoms of a bad defrost thermostat include:

  • Frost build-up in the freezer
  • The refrigerator running constantly or not cooling properly
  • Water leaks inside the refrigerator
  • The defrost heater not activating

This OEM part is also compatible with Maytag, KitchenAid, Jenn-Air, Amana, Magic Chef, Admiral, Norge, Roper, and Kenmore models.

Do-It-Yourself Stories from Customers like You The fridge was not cooling and the freezer not freezing   Richard C. • Chesterfield , VA • August 18, 2015

Took everything out and transferred it to coolers etc. Unscrewed and took freezer unit apart ..Evaporator fan not working and made decision to replace motor and bi metal defrost thermostat. Order parts from Appliance Pros. com and the unit was put back together and so far it corrected the problem. The instructions and service were outstanding. Great Company. Read more

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Defrost Thermostat
Genuine Frigidaire part
By: Frigidaire
Part Number: 5303918568

The Defrost Thermostat is an OEM replacement part for Frigidaire upright freezers. It is a temperature-sensing device that monitors coil temperatures, triggering the automatic defrost cycle to safely melt frost buildup obstructing airflow. Located near refrigerator coils, the defrost thermostat optimizes energy-efficient defrosting.

Causes often relate to regular exposure to fluctuating interior freezer temperatures over extended periods. Impacts compromising calibration can also force early replacement.

Symptoms involve:

  • Excessive ice accumulation hinders air circulation and cooling power
  • The inability of the unit to maintain a frost-free interior environment
  • Higher utility costs from the refrigerator constantly fight accumulation

This Frigidaire OEM replacement part fits upright models by Electrolux, Gibson, and some Kenmore models.

Do-It-Yourself Stories from Customers like You Not defrosting   William M. • Richland , WA • March 08, 2018

Replaced thermostat and heater. Read more

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Defrost Thermostat
Genuine Ge part
By: Ge
Part Number: WR50X10073

The Defrost Thermostat is an OEM part for GE refrigerators. This component monitors the evaporator temperature. It activates warming to defrost the evaporator once the temperature reaches a certain point.

Over time, the defrost thermostat can fail due to electrical issues, exposure to fluctuating temperatures, or general wear and tear. A malfunctioning thermostat can lead to excessive frost buildup, affecting the refrigerator’s cooling efficiency.

Symptoms of a bad defrost thermostat include:

  • Excessive frost buildup in the freezer
  • The refrigerator or freezer not maintaining the correct temperature
  • Water leaks inside the refrigerator
  • The defrost heater not activating during the defrost cycle

This GE replacement part is also compatible with Hotpoint, RCA, and some Kenmore models.

Do-It-Yourself Stories from Customers like You The evaporator coil kept getting heavily frosted and the compressor ran almost continuously   Reid D. • Santa Maria , CA • April 01, 2016

The defrost heater element looked good and had continuity. The defrost thermostats checked good, so that just left the Defrost Module as the likely suspect. I installed a new defrost control module and thermostats. The thermostats were inexpensive and the old ones could have been intermittent, The only "tricky" part was finding out how to get to the back screw that holds the main control panel. Discovered that the return air duct surrounding the control panel needed to come off. It helps... Read more

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