Category: Lg refrigerator temperature sensor

Lg refrigerator temperature sensor

If you have a refrigerator that never cycles on or a refrigerator that runs continuously, freezing everything in the refrigerator and freezer compartments, the chances are good that you have a bad thermostatic temperature control. For a refrigerator that never turns on, the problem might also be a start relay switch, a bad motor start capacitor or even a bad compressor motor.

Of all the possible causes, the thermostatic control is one of the easiest to test. There are dangers involved in any type of do-it yourself project if the proper safety precautions are not taken.

Working with electricity is especially dangerous because you cannot see it with the naked eye, so always unplug an appliance before working on it. There will be some cases where you will need to take live voltage readings, but this will not be one of those times. Modern, frost-free, auto-defrost refrigerators consist of a confusing network of colored wires. Just as you need a road map to find your way around a strange city, the manufacturer has provided you with a guide to find your way through that network of wiring in the form of a wiring diagram.

In some cases that manufacturer provides that wiring diagram in two formats — a pictorial diagram and a schematic diagram. For the beginner, the pictorial diagram is the easiest to follow because it shows the various components as they actually look. The schematic diagram, on the other hand, uses symbols to represent the components.

Begin by using the pictorial diagram, but learn the meaning of the symbols too because some manufacturers only provide a wiring diagram in schematic format. As a rule, these diagrams are found on the back of the refrigerator or in the compressor compartment. Referring to the wiring diagram, locate the wiring harness coming from the temperature control and disconnect it from the terminal board in the compressor compartment. Set the function switch on your digital multimeter DMM to the "R X 1" scale, and connect the test probes to the two wires from the thermostatic switch that supplies power to the compressor motor.

If the temperature control passed the electrical function test but the refrigerator runs continuously, freezing everything in the refrigerator compartment, the problem is a defective temperature sensing bulb on the temperature control. The temperature-sensing bulb is an integral part of the temperature control switch, so you need to replace the complete control. Based in Colorado Springs, Colo. Walch spent 40 years working in the electrical trades and holds an Associate of Applied Science in applied electrical engineering technology from Alvin Junior College.

lg refrigerator temperature sensor

Skip to main content. Home Guides Home Home Improvement. Customer Service Newsroom Contacts.NOTE: If you see any error code on the display screen, please visit our Error Codes - Refrigerator article to troubleshoot and prevent the error from showing again.

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You should hear the compressor kick back on and the unit will stabilize and start cooling within 24 hours. If not, then there is a power supply problem and the unit will require a repair service. Refer to your owner's manual for the recommended power voltage. Test another device on the outlet, if another device is working on the outlet, then the unit is not receiving any power. It will require a repair service; please visit our Request a Repair page.

Sorry, you must perform the power supply check above to determine if the unit is receiving enough power or no power. Using a thermometer, the temperature of the food may be different from the unit's internal temperature.

How To Test Your Defrost Thermostat & How They Work

The temperature measured by a thermometer can change depending on where the unit is placed and the frequency of opening the door. Place a thermometer inside a liquid item that has been inside the refrigerator for more than 24 hours such as juice, milk, a jar of pickles, or any other similar condiment to get a more accurate reading of the average temperature inside the unit. Which part of the refrigerator is not cooling enough?

Start a service request. NOTE: Over time dust and debris can build up on the condenser of your unit.

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This can result in a loss of cooling performance. Try using a vacuum cleaner with an attachment to clean the condenser cover and vents. Do not remove the panel covering the back of the unit. If you are presently covered by an extended warranty service provider, please contact your provider to request an out of warranty repair. LG provides authorized repair service centers all across the nation that can repair your unit.

Click the link below to find your nearest LG authorized repair service center by entering your address and product. If you do not have an extended warranty and cannot locate a nearby repair service provider, please call us at Watch the video below and follow the recommended steps underneath to troubleshoot cooling issues.

Check to see that the unit is set to its optimal setting. This feature disables all cooling in the refrigerator and freezer sections to conserve energy while on display in a retail store. After holding the buttons for five seconds, the control panel will beep, and the temperature settings will display to confirm that DEMO MODE is deactivated. Adding hot food to the refrigerator compartment will temporarily spread heat throughout the unit.

The unit will require some time to cool down the hot food and regulate its internal temperature. When there is too much food blocking the air vents of the refrigerator, cold air will be prevented from circulating throughout the unit properly.

Also, just a few items in the refrigerator can cause cooling to be obstructed because the unit will always try to regulate itself when it's circulating too much cold air.

If the unit is opened too frequently, the unit will not be able to maintain a regulated temperature.

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Avoid frequent and unnecessary opening of the door to enable the unit to conserve cold air circulation throughout the unit.

The unit must not be too close to the wall, make sure there is enough clearance on all sides of the unit. If you keep hearing the door alarm sound, even when the door is closed. It means the door switch did not detect the door closing. Thus, cold air will not blow in the unit, and the unit will not get cold. The door switch may be disconnected. Test the door switch according to it's type and watch if the fluorescent lights in the unit turn OFF.

If your unit has two doors, repeat the steps for the LEFT door, using the switch to test if the lights turn off. Follow the steps below to check the door switch connection.

Even if the lights turn offcheck the door switch because a slightly loose connection can cause cooling issues. NOTE: After checking all connectors and pushing them in firmly, if you still hear the alarm sound again, the unit will require a repair service.Thermistors are a component in refrigerators, furnaces, air conditioners and other systems that need to manage temperatures.

In refrigerators, the thermistor is a key part of the system that allows the refrigerator to stay within a short range of temperatures and turn on its cooling cycle when the temperature starts to rise. Problems with the thermistor will keep the refrigerator from operating correctly. The thermistor is designed to measure temperature where it is located. It is a simple metal device that channels an electrical charge within the refrigerator compartment. Thermistors can take many different shapes, but are usually small capsule-like components that are protect by a plastic shield.

The thermistor works through its resistance. It is made from highly specific metal alloy combinations. When the electrical current passes through these metals, it encounters a certain amount of resistance. However, resistance is also affected by the temperature around the thermistor. By comparing the resistance of the thermistor at one temperature with its current resistance, the thermistor can sense how much the temperature has changed and whether it has gone up or down.

It is not enough for the thermistor to sense what the current temperature is, it also needs to communicate this information to the primary thermostat system of the refrigerator. So the thermistor reads its own resistance and sends the value to the control system.

The control system is fitted with the necessary circuitry to interpret the value and alter the temperature. Because the thermistor is dependent on its electrical current to work, it is also subject to electrical faults.

A thermistor can burn out or malfunction and stop sending the correct signals to the thermostat. In this case, all thermostat functions might be working correctly, but the small thermistor might need to be replaced to solve the problem. Show Comments.It should be between 35 and 40 degrees Fahrenheit.

A freezer should be between 0 to 5 degrees Fahrenheit. To find out whether yours is, take the front panel off the control panel. You will see a small oval or cylindrical copper tube with a sensor bulb on one end. The tube might be a few inches to a couple of feet long, depending on the model and make of the refrigerator. If you can see all of tube, you can replace it and fix the control. For those who have accessible controls, follow these steps:. Go to an appliance parts store with the switch and tube and the model and serial number of the refrigerator and get a new part.

lg refrigerator temperature sensor

Do not kink, bend, or fold the new tube as you carry it home or install it. Put the new tube into the refrigerator just as the old one was installed with either push-on clips or wires that have to be screwed together.

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But also check to see whether the vents are plugged up or free. Remember, too, to vacuum the coils and evaporator fan blades. If the temperature switch appears to be fine and you think the food compartment is still too warm, check for gaps in the seal along the door. It takes little more than a screwdriver and a new switch to replace faulty door switches.

Pry up the ring beneath the push-button switch with a screwdriver. After the switch and ring are loose, pull out the wires. Attach the new switch to the wires. Gary and Peg Hedstrom are self-taught repair masters with experience in carpentry, plumbing, appliance repair, and more. Judy Ondrla Tremore is a writer and editor for various newspapers and magazines. How to Fix Refrigerator Temperature Problems.Chat with a Pro. In Stock - Ships Monday Guaranteed.

Genuine LG part. See all items in Refrigerator Cap Or Cover. Check your model number or use our Cross Reference Tool to determine if this part will work with your appliance.

Where can I find my model number? Removed back cover in refrigerator to find the coil frozen. I ordered the part overnight and I replaced the defrost sensor, now all is well!!

Fast and easy thanks to AppliancesPartsPros. Was this DIY Story helpful to you? I replaced the evaporator sensor.

Your company sent me the exact sensor I needed at a great price. No other company was able to help. No call was needed. Your website was great. Note: This video is intended to give you the general idea of the part replacement procedure. Your appliance may differ depending on the manufacturer and model.

lg refrigerator temperature sensor

Read all 14 Questions. Tim for Model Number Lfxst. Icing Sensor will be the same as the freezer sensor. Answer Bill, The temperature sensor for the refrigerator section will be 30K at 32 F and approximately 5K at room temp of 70 F. The sensor and thermistor should be the same reading for the refrigerator compartment.

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Answer Phillippe, We will send you a tech sheet on how to test the components of the compressor circuit. Abdel for Model Number Kenmore elite Answer Hello Abdel, the fresh food temperature sensor for your model is part EBRhowever it is no longer available as the manufacturer has discontinued the part. Answer Mark, You will need to gain access to the evaporator and check for a frost pattern on the coils.

It sounds like you could have a leak or faulty compressor may be running not pumping the refrigerant. You should see the same frost coming to the evaporator and leaving. Answer KP, Apparently so, around 36 degrees it should read around 27K ohms. Getting your parts We're open and continuing to ship packages.If your refrigerator's not cold enough, first check whether containers are blocking air flow at the vents; the owner's manual usually shows where the vents are.

High temperatures are also a sign of a control system problem, a failure in the air control damper, low refrigerant charge and other malfunctions.

Check out the following videos for expert advice on resolving refrigerator cooling issues. Troubleshooting a refrigerator not cooling video.

Diagnosing refrigerator evaporator fan problems video. Troubleshooting compressor problems in refrigerators video. Diagnosing refrigerator thermistor problems video. Troubleshooting defrost system problems video. If the refrigerator is not cooling enough, the thermistor might be faulty.

The thermistor sends temperature information to the thermostat, so a broken thermistor will give bad information. If your refrigerator isn't keeping the temperature you set, the problem could be the thermistor, which senses the temperature. This DIY repair guide shows how to easily replace the thermistor in 15 minutes.

Refrigerator: Not cooling at all

Is your refrigerator too cold or not cold enough? The thermistor might not be reading the temperatures correctly.

This DIY repair guide and video give easy-to-follow instructions on how to replace the thermistor in a top-freezer refrigerator in just 6 steps. The condenser fan is in the machine compartment of the refrigerator next to the compressor. It moves air across the condenser coils to help cool the hot refrigerant coming out of the compressor. The refrigerant is cooled before it moves through the expansion device and into the evaporator.

If the condenser fan is defective, replace it. Does your refrigerator seem warmer than it should? The problem could be the condenser fan motor. This DIY repair guide and video show how to easily replace a failed condenser fan motor in a top-freezer refrigerator in just 6 steps. The electronic control board-also called the main control board or the power control board PCB -controls the compressor and the defrost cycle.

When it senses that the compressor must run to keep the refrigerator cool, it sends voltage to the compressor and fans. The electronic control board also receives signals from temperature sensors to monitor the temperatures inside the refrigerator and freezer. With this information, the electronic control board controls the defrost cycle. You can usually do a diagnostic test on the electronic control board to see how well it's working.

The test varies by model, but the most common is the Forced Defrost test. See the tech sheet for instructions on running the diagnostics. Replace the electronic control board if it's not working correctly.

Temperature Sensor

If the control panel lights or fans in your side-by-side or bottom-freezer refrigerator aren't coming on, it could mean the electronic control board has failed. This DIY repair guide shows how to replace a faulty refrigerator electronic control board in 7 quick steps. If your refrigerator won't cool at all, the electronic control board may be faulty. This DIY repair guide and video show how to easily replace the electronic control board, and it usually takes only 15 minutes or less.Before starting any type of repair, unplug your appliance.

Always wear work gloves and safety goggles to protect your hands and eyes from injury. You must be logged in to post a comment. When the sensor is defective, the defrost cycle may stop functioning, which ultimately causes the evaporator in the freezer to ice up and the temperature in the fresh food compartment to increase.

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Start the repair by opening the freezer door and removing the lower frozen food bin. Lift the back of the bin up to release the locking tabs. With the back angled up, pull the front end of the bin out of the freezer. Now remove the door assembly from the freezer rails. Locate the two screws on the side of the rails which hold the assembly and rails together. Take the screws out with a Phillips screwdriver. Once both screws are removed, lift up on the door assembly to disengage the four locking tabs, and then pull the door and frame off the rails and place it in a safe area.

Push the rails back into the freezer, and pull the upper basket out. Depress the two tabs on the front of the basket to release it from the rails. Angle the front of the basket up before lifting the entire assembly out of the freezer.

lg refrigerator temperature sensor

Push the rails back into the compartment. With the racks out of the way, it is time to remove the rails. Using a Phillips screwdriver, take out the screws from the upper rail, first. After the screws are removed, pull the rail off the freezer wall. Repeat the same process on the other side. Now move on to the bottom rails. Start by pulling the rails out of the compartment to gain access to the connecting rod in the back that links the left and right rail.

To disconnect the rod, release the locking tab situated between the gear wheel and the mounting plate.

Technical Details

Once you have the first side off, simply pull the other side out of the opposite gear wheel. Push the rails back in, and use a Phillips screwdriver to remove the rails from the freezer walls.

First, with a putty knife, open up the small rectangular access cover located in the upper right hand corner.

Insert the putty knife into the small gap in between the cover and rear panel to disengage the locking tabs keeping them connected. Take out the small access cover and set it aside.

To remove the rear panel, reach into the opening you created and find the locking tab connecting the back panel to the freezer compartment. Once that tab is released you can start pulling off the panel. When all the tabs are disengaged, lower the panel down to the freezer floor, and disconnect the two wire harnesses linking the rear panel to the back wall. Now you can pull the rear panel out of the freezer.

You have finally gained access to the defrost sensor, which is located near the top right side of the evaporator. It is important to be extra careful while taking the sensor out. Damaging the evaporator coils or fins can lead to a Freon leak, which can only be fixed by a professional.

To begin the removal process, cut off the three zip ties holding the defrost sensor in place. Once all the zip ties are gone, you can take the defrost sensor out by first extracting the thermistor at the bottom and then pulling out the fuse from the top.


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