FIXED LFX31925ST LG Refrigerator with frozen evap coil.

kiko67

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Aug 31, 2019
Messages
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Location
florida
Model Number
LFX31925ST
Brand
LG
Age
1-5 years
Hi, new to this forum. I have a LFX31925ST with the frozen evaporator coil. I tested the heater and have continuity and when I tested the thermistor the orange wire has not continuity and the other one (I think I remember that is red) has continuity.
I could not find much info on google. Please help.
Thanks
 

Jake

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Hi,

Which evaporator coil is frozen? You have two on this model, one in the refrigerator section, one in the freezer section.

Jake
 

Jake

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Thanks,

You did ohm it like this below? Unplug your refrigerator first.

Here's how: Remove the defrost sensor controller from the freezer side evaporator. Put the sensor inside a small glass and fill it with crushed ice, then just enough water to cover it. LG sensors have a slow response time so leave it in the ice water for five minutes then measure its resistance. At 32*F the sensor should be at 30K ohms, +/- 5%.

Here's the defrost sensor controller for your model you can order if yours tests bad:
6615JB2005R Controller Assembly


Jake
 

kiko67

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florida
I did and I have an open circuit, so I guest the defrost sensor control is bad. Thank you very much for your help.
Kiko
 

Jake

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Yes Kiko, its bad. Order the new one I posted above and let us know how it goes.:)

Jake
 

Jake

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Excellent Kiko, glad to hear the new controller assembly fixed it. (y)

Thanks for the update!

Jake
 

kiko67

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Hi, The problem show up again but this time the controller and the heater are good. what else could be?
 

Jake

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It would be the main control board, which is located in the back of your refrigerator.

Here's the main control board for your model:
EBR75234703 Pcb Assembly,main


Jake
 

Jake

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Ok, sounds good.

Jake
 

kiko67

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florida
Hi Jake, is there any procedure to intall the control board? Or is just plug and play.
Thanks
 

Jake

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It should be plug and play.

Jake
 

Jake

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Your welcome, keep us posted.

Jake
 

kiko67

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I installed the board on saturday and today I have a "f dh" error on the door. What it could be now? These is crazy.
 

Jake

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Then it's either that defrost sensor controller you installed went bad, or the defrost heater went out. Ohm test both parts again and let us know.

If you bought the defrost sensor controller from my link to it above, then its still under warranty, as all parts from our links come with a 365 day warranty on all parts.

Jake
 
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