Author Topic: Refrigerator Evaporator Fan Testing?  (Read 6067 times)

Offline musicpro

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Refrigerator Evaporator Fan Testing?
« on: October 21, 2009, 06:45:00 AM »
LG Refrigerator Model: LRBN2251 or LRBC2252

Hi,

I'm somewhat new to this type of repair. This question is based off my last post:

http://appliancejunk.com/forums/index.php?topic=5103.0

My evaporator fan isn't working.

I have a few questions...

I have a Cen-Tech Multimeter, Model 92020.

How do I test the refrigerator voltage going to my evaporator fan?

Is it AC or DC?

Is the White center wire the negative, and the Gray and Purple wires positives?

How do I check the resistance on the fan itself?

Check it in Ohms?

Red to one positive, and Black to negative (White)?

Then test the other positive with the White negative again?


Also, the compressor and fan in the rear are working.

Thanks for all replies,
Jeff

Offline Wedgeman55

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Re: Refrigerator Evaporator Fan Testing?
« Reply #1 on: November 12, 2009, 01:08:05 AM »
I just replaced one of these fans yesterday on a 22522 model,  bottom freezer.   It is a 2 speed fan.   If you run the refrigerator into test mode (hold express cooling,  and freezer colder touchpad buttons together for 3 seconds refrigerator will go into test mode)  you will get power to the fan on test 1.   compressor will run,  and you should get 120 volts AC to fan plug.   Reason for three wires - 2 speed fan.      If you're getting 120 between white (neutral ) and one of the other wires,   you have a bad fan and must be replaced.     To get out of test mode,   you must do this (pushing pad buttons together )   twice to return refrigerator to run mode.  test 2,  by the way,  tests defrost system.       
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Offline JWWebster

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Re: Refrigerator Evaporator Fan Testing?
« Reply #2 on: November 12, 2009, 10:57:17 AM »
I imagine the 2 speeds are needed for the express cool function. With one speed for regular duty and another higher speed to quickly add a lot of cold air.
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Offline Wedgeman55

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Re: Refrigerator Evaporator Fan Testing?
« Reply #3 on: November 12, 2009, 11:40:36 PM »
Exactly, JW, on the express cooling feature.  WHAT HAPPENED TO THE SIMPLE SINGLE SPEED FAN THAT WOULD RUN FOR 20 YEARS????   I had about 10 fan motors in my truck on the first trip to that house.   Of course,   no 2 speed fans in that mix.   These fans seem to be failing pretty fast.   I'm going to stock one of these on the truck as a lot of people have bought LG (Lotsa Grief, right? )   Found another LG today that has erratic defrost times,  actually thawing out the freezer during defrost.   Turning the ice cubes to water during defrost.   No error codes.   Bad board.  2nd one I've had like this already.   Last one,  replaced board and all was well.   Thank you,  Korea! 
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Offline JWWebster

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Re: Refrigerator Evaporator Fan Testing?
« Reply #4 on: November 13, 2009, 12:02:21 AM »
Save yer old boards and send em to Bruce.
May the hinges of our friendship
        never grow rusty.

About the icons: The beer is tip link, if a tech saves ya some money buy em a 6 pack. The small green square=personal message. The green dot is a link to my web page on appliance repair and other general BS I love to post. The letter sends me email.
I love fan letters! LOL

Offline RegUS_PatOff

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Re: Refrigerator Evaporator Fan Testing?
« Reply #5 on: November 14, 2009, 05:35:12 PM »
... WHAT HAPPENED TO THE SIMPLE SINGLE SPEED FAN THAT WOULD RUN FOR 20 YEARS???? 
It's some Government Energy Program ...

It's not only LG ....
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Offline musicpro

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Re: Refrigerator Evaporator Fan Testing?
« Reply #6 on: November 28, 2009, 07:04:03 PM »
Is there a good place to have boards repaired? I think it's the board, the buzzer is corroded and has a broken connection.

This board isn't being made anymore, and the closest match I can find is $230 new and $90.00 used.

Thanks again for all the replies,
Jeff

Offline RegUS_PatOff

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After leaving this Earth, "Do you want the smoking or non-smoking section?"

Offline musicpro

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Re: Refrigerator Evaporator Fan Testing?
« Reply #8 on: November 28, 2009, 07:52:51 PM »
My original part number is:

6871JB1213E

Thanks again,
Jeff

Offline JWWebster

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Re: Refrigerator Evaporator Fan Testing?
« Reply #9 on: November 28, 2009, 08:13:18 PM »
May the hinges of our friendship
        never grow rusty.

About the icons: The beer is tip link, if a tech saves ya some money buy em a 6 pack. The small green square=personal message. The green dot is a link to my web page on appliance repair and other general BS I love to post. The letter sends me email.
I love fan letters! LOL

Offline RegUS_PatOff

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Re: Refrigerator Evaporator Fan Testing?
« Reply #10 on: November 28, 2009, 08:49:42 PM »
# LRBN2251*** or # LRBC2252***

LG LRBN22511xx Parts manual says 6871JB1215A

SearsPartsDirect says replacement =

6871JB1215J


6871JB1213E for LBC22518 or LBN22515
6871JB1213G

what IS your model number ?
« Last Edit: November 28, 2009, 09:21:28 PM by RegUS_PatOff »
After leaving this Earth, "Do you want the smoking or non-smoking section?"

Offline musicpro

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Re: Refrigerator Evaporator Fan Testing?
« Reply #11 on: November 28, 2009, 10:01:51 PM »
I'm not sure what my model number is. Can't find a model anywhere on the refrigerator. I checked everywhere. But it came with a tag # LRBN2251*** , # LRBC2252***.

As for the boards. The pictures of those other models look much different from what I have. The G is close but missing one main connection and one component.

Thanks again,
Jeff

 

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