How to Test Your Compressor Motor and Its Overload Device on an LG refrigerator.

简介

Use this guide to test the linear compressor motor and its attached overload device for your LG refrigerator.

This guide will work for most LG refrigerators with linear compressors. This guide is written with an LG model LFX25973 refrigerator. If you have a different model, you may encounter some minor disassembly differences, but the overall repair process will be the same.

The compressor is the heart of your refrigerator, and if it fails or can't start, your refrigerator is useless. Without the compressor, the refrigerant can't circulate and can't function to cool the interior of the fridge.

Symptoms of such failure include no compressor sound from the fridge and increasing temperature inside the fridge. Sometimes, there may be repeated clicking noises coming from the lower part of the fridge.

你所需要的

步骤 1 Unplug your refrigerator

How to Test Your Compressor Motor and Its Overload Device on an LG refrigerator., 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 Unfasten the condenser cover

How to Test Your Compressor Motor and Its Overload Device on an LG refrigerator., Unfasten the condenser cover: 步骤 2 中的图像 1，1

Use a Phillips screwdriver to remove the screws securing the condenser cover to the rear of the refrigerator.

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步骤 3 Remove the condenser cover

How to Test Your Compressor Motor and Its Overload Device on an LG refrigerator., Remove the condenser cover: 步骤 3 中的图像 1，3

How to Test Your Compressor Motor and Its Overload Device on an LG refrigerator., Remove the condenser cover: 步骤 3 中的图像 2，3

How to Test Your Compressor Motor and Its Overload Device on an LG refrigerator., Remove the condenser cover: 步骤 3 中的图像 3，3

Tilt the top edge of the condenser cover toward you.
Lift and remove the condenser cover.

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步骤 4 Disconnect the compressor

How to Test Your Compressor Motor and Its Overload Device on an LG refrigerator., Disconnect the compressor: 步骤 4 中的图像 1，3

How to Test Your Compressor Motor and Its Overload Device on an LG refrigerator., Disconnect the compressor: 步骤 4 中的图像 2，3

How to Test Your Compressor Motor and Its Overload Device on an LG refrigerator., Disconnect the compressor: 步骤 4 中的图像 3，3

Squeeze and pull down the compressor connector to disconnect it.

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步骤 5 Test the overload and compressor winding

How to Test Your Compressor Motor and Its Overload Device on an LG refrigerator., Test the overload and compressor winding: 步骤 5 中的图像 1，1

You should wear gloves to protect your hands from the sharp edges in this area
Use your multimeter to measure the resistance between the two pins on the connector.
Acceptable values are between 7 and 14 ohms
This test checks both the compressor winding and thermal overload device.
If you get an open reading, it could be either the motor or the thermal overload device. Follow the next steps to continue diagnosing.

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步骤 6 Reposition the connector cover

How to Test Your Compressor Motor and Its Overload Device on an LG refrigerator., Reposition the connector cover: 步骤 6 中的图像 1，3

How to Test Your Compressor Motor and Its Overload Device on an LG refrigerator., Reposition the connector cover: 步骤 6 中的图像 2，3

How to Test Your Compressor Motor and Its Overload Device on an LG refrigerator., Reposition the connector cover: 步骤 6 中的图像 3，3

Use a Phillips screwdriver to remove the screw(s) securing the connector cover to the compressor.
Slide the connector cover off of the compressor.
Don't try to fully remove the connector cover as it is still connected to the compressor.
The thermal overload device is located in the cover and is wired in series with the compressor.

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步骤 7 Disconnect the power connector from the compressor

How to Test Your Compressor Motor and Its Overload Device on an LG refrigerator., Disconnect the power connector from the compressor: 步骤 7 中的图像 1，2

How to Test Your Compressor Motor and Its Overload Device on an LG refrigerator., Disconnect the power connector from the compressor: 步骤 7 中的图像 2，2

Use a small flathead screwdriver to pry the power connector off of the compressor.

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步骤 8 Test the compressor winding resistance

How to Test Your Compressor Motor and Its Overload Device on an LG refrigerator., Test the compressor winding resistance: 步骤 8 中的图像 1，2

How to Test Your Compressor Motor and Its Overload Device on an LG refrigerator., Test the compressor winding resistance: 步骤 8 中的图像 2，2

Use your multimeter to check the resistance between the bottom and top left pins.
The correct resistance value is 7.2-9.2Ω for a FLA075LANA or FLB075LANA compressor; other models show 6-8Ω.
If you were reading an open circuit in the first test, and now you get good resistance readings for the compressor, your overload device is faulty; replace it.