• Please note, some of the links on our site are affiliate links (Learn More)

LFX31945ST/02 LG Refrigerator Error F dH

Beiss

Premium Member
Joined
Mar 25, 2020
Messages
10
Location
Hamilton nj
Model Number
LFX31945ST/02
Brand
LG
Age
6-10 years
Hi,

The resistance of the sensor assembly and heater tested ok so I replaced the control board but the error comes back after about a day and a half. I don't know what else to do so I'll just replace them and see what happens.

Thanks
 

Jake

Appliance Tech - Admin
Staff member
Joined
Aug 24, 2004
Messages
111,077
Location
McMullen Valley, Arizona
If its cooling fine like you said before, don't worry about it.:)

The fan motor you replaced already fixed it here:

Jake
 

Beiss

Premium Member
Joined
Mar 25, 2020
Messages
10
Location
Hamilton nj
Jake,

It cools fine, but I have to yank it out from the wall and unplug it every day and a half to reset the display panel and its functions.

Thanks again for your help.

Dennis
 

Jake

Appliance Tech - Admin
Staff member
Joined
Aug 24, 2004
Messages
111,077
Location
McMullen Valley, Arizona
I don't know what else could be causing that Dennis, I will ask Rick.

Jake
 

Jake

Appliance Tech - Admin
Staff member
Joined
Aug 24, 2004
Messages
111,077
Location
McMullen Valley, Arizona
Was the F dh coming up BEFORE your replaced that FREEZER FAN motor?

Jake
 

rickgburton

Appliance Tech - Moderator
Staff member
Joined
Jul 11, 2006
Messages
38,719
Location
Murray, Utah 84107, United States
Push the test button on the main board 3 times.
Snapshot_5.jpg


Locate CON3 on the board and check for 120 VAC between the blue wire and the orange wire.
Snapshot_4.jpg


Press the test button once to release test mode an check for 0 VAC between the blue wire and the orange wire
 

Beiss

Premium Member
Joined
Mar 25, 2020
Messages
10
Location
Hamilton nj
Push the test button on the main board 3 times.
View attachment 49443

Locate CON3 on the board and check for 120 VAC between the blue wire and the orange wire.
View attachment 49444
Test mode 3 - blue and orange = 120
No test mode - blue and orange = 1.1

Just to be sure, I used the top blue wire in my pic (I know enough about electricity to be dangerous).
 

Attachments

rickgburton

Appliance Tech - Moderator
Staff member
Joined
Jul 11, 2006
Messages
38,719
Location
Murray, Utah 84107, United States
Check the wire connector is on all the way. Measure the resistance of the defrost heater, Fuse M, and the defrost sensor. Post back the results.
Snapshot_1.jpg
 

rickgburton

Appliance Tech - Moderator
Staff member
Joined
Jul 11, 2006
Messages
38,719
Location
Murray, Utah 84107, United States
Top