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FIXED LG Refrigerator LFX31945ST/01 Fans not running in run mode

willow dale

Premium Member
Joined
Jun 12, 2021
Messages
2
Location
Manitoba
Model Number
LFX31945ST/01
Brand
LG
Age
6-10 years
Hi I'm new to this,I can test and do refrigeration,I changed compressor on this unit, weighed proper 134a in unit,PCB Board twice,Defrost sensor changed ,freezer temp sensor changed, i can't get Freezer fan/fridge fan to run in run mode, in text mode they run nicely, what next step?
 

rickgburton

Appliance Tech - Moderator
Staff member
Joined
Jul 11, 2006
Messages
44,269
Location
Murray, Utah 84107, United States
,PCB Board twice
Where did you get the boards? How long ago? Are there any error codes? If an error code is displayed the fan won't run. Usually when the fan won't run except in test mode the board is the problem. I don't have a tech sheet for that model but I think the wiring is the same for the fans. Locate CON6 and measure the voltage across the gray wire and blue wire (1 to 2 in this image). If it's less than 12 VDC the board is bad.
fan.jpg
 

Jake

Appliance Tech - Admin
Staff member
Joined
Aug 24, 2004
Messages
123,822
Location
McMullen Valley, Arizona
Anytime Rick!

Jake
 

Jake

Appliance Tech - Admin
Staff member
Joined
Aug 24, 2004
Messages
123,822
Location
McMullen Valley, Arizona
In your 1st post you mentioned you already replaced the freezer temperature sensor. Did you ohm test it?

This is the freezer temperature sensor for your model:
ACQ73244001 Temperature Sensor


Jake
 
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