简介

Use this guide to test your LG refrigerator's fresh food compartment thermistor.

This thermistor provides temperature data to the main control board. The board monitors its resistance, which varies with temperature.

If the thermistor fails, the refrigerator will not function correctly. Generally, it will not be able to maintain the correct temperature in the fresh food compartment. Depending on the fault (short or open circuit), it may cease functioning altogether and give an error code.

If the refrigerator's wiring harness fails, either with an open circuit or a short circuit, the refrigerator is not repairable. Since the harness is foamed in place and cannot be removed for repair, the refrigerator must be recycled.

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步骤 1 Unplug your refrigerator

LG Refrigerator Fresh Food Thermistor Test and Replacement, Unplug your refrigerator: 步骤 1 中的图像 1，1

Unplug your refrigerator before you begin your repair.
If you are testing or repairing the following items, you may also need to shut off and disconnect the water supply:
Condenser fan motor
Compressor motor and thermal overload device
Water supply valve assembly

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步骤 2 Open the doors

LG Refrigerator Fresh Food Thermistor Test and Replacement, Open the doors: 步骤 2 中的图像 1，3

LG Refrigerator Fresh Food Thermistor Test and Replacement, Open the doors: 步骤 2 中的图像 2，3

LG Refrigerator Fresh Food Thermistor Test and Replacement, Open the doors: 步骤 2 中的图像 3，3

Open both refrigerator doors fully.

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步骤 3 Remove the shelves

LG Refrigerator Fresh Food Thermistor Test and Replacement, Remove the shelves: 步骤 3 中的图像 1，3

LG Refrigerator Fresh Food Thermistor Test and Replacement, Remove the shelves: 步骤 3 中的图像 2，3

LG Refrigerator Fresh Food Thermistor Test and Replacement, Remove the shelves: 步骤 3 中的图像 3，3

Lift up the front edge of the shelf to release it.
Unhook the shelf and remove it.
Repeat the last two steps for each shelf you wish to remove.

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步骤 4 Unfasten the control board cover

LG Refrigerator Fresh Food Thermistor Test and Replacement, Unfasten the control board cover: 步骤 4 中的图像 1，1

Use a Phillips screwdriver to remove the screws securing the control board cover.

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步骤 5 Remove the control board cover

LG Refrigerator Fresh Food Thermistor Test and Replacement, Remove the control board cover: 步骤 5 中的图像 1，3

LG Refrigerator Fresh Food Thermistor Test and Replacement, Remove the control board cover: 步骤 5 中的图像 2，3

LG Refrigerator Fresh Food Thermistor Test and Replacement, Remove the control board cover: 步骤 5 中的图像 3，3

Tilt the top edge of the cover toward you and lift it off.

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步骤 6 Locate thermistor connector

LG Refrigerator Fresh Food Thermistor Test and Replacement, Locate thermistor connector: 步骤 6 中的图像 1，1

Locate connector 7 (Con 7) on the control board

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步骤 7

LG Refrigerator Fresh Food Thermistor Test and Replacement: 步骤 7 中的图像 3，3

Release the wiring harness for Connector 7 from the harness hooks.
Disconnect Con 7.

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步骤 8 Test thermistor circuit

LG Refrigerator Fresh Food Thermistor Test and Replacement, Test thermistor circuit: 步骤 8 中的图像 1，1

在这个步骤中使用的工具：

Digital Multimeter

$59.95

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Measure the resistance between the two white wires as shown in this document.
Use a multimeter set to the ohms (Ω) setting.
Gently put the probes into the connector holes that correspond to the white wires. Alternatively, you can use sharp insulation piercing probes on the white wires.
Measure the resistance of the thermistor.
If the measurement is neither open (OL) nor shorted (less than 1Ω), measure the temperature in the fresh food compartment. Compare these figures to this chart. If it isn't in spec, go to the next step.
The resistance of the thermistor should be about 11kΩ at room temperature.

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步骤 9 Access the thermistor.

LG Refrigerator Fresh Food Thermistor Test and Replacement, Access the thermistor.: 步骤 9 中的图像 1，3

LG Refrigerator Fresh Food Thermistor Test and Replacement, Access the thermistor.: 步骤 9 中的图像 2，3

LG Refrigerator Fresh Food Thermistor Test and Replacement, Access the thermistor.: 步骤 9 中的图像 3，3

Pry down the thermistor grille/holder with a spudger or small flat-blade screwdriver.

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步骤 10 Free the thermistor

LG Refrigerator Fresh Food Thermistor Test and Replacement, Free the thermistor: 步骤 10 中的图像 1，3

LG Refrigerator Fresh Food Thermistor Test and Replacement, Free the thermistor: 步骤 10 中的图像 2，3

LG Refrigerator Fresh Food Thermistor Test and Replacement, Free the thermistor: 步骤 10 中的图像 3，3

Gently use a pair of long-nose pliers to pull the thermistor down from its holder.
Be very careful with this action, as the leads to the thermistor are short and can be easily damaged.

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步骤 11 Test the thermistor

If the measurement at the control board was out of spec or showed open (infinite resistance) or short (near zero resistance), check the resistance at the thermistor itself.
Disconnect the thermistor from the wiring harness. You will likely have to cut one or both of the leads, unless there is a connector near the thermistor.
The resistance of the thermistor should be about 11kΩ at room temperature.
If the thermistor tests okay, the problem is in the wiring harness. You can inspect the accessible parts of the harness for faults. If the fault is not accessible, the wiring harness is foamed in and can't be repaired. Recycle the refrigerator.