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LG LFX25960st er ff error


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4 replies to this topic

#1 blairville

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Posted 12 June 2013 - 12:46 PM

Hello all,

I have a LG LFX25960st French door refrigerator. This was in a house I recently moved into, so don't know the history of it. I get an er ff error after about 6 or 7 hours after the fridge is on. Both fans in freezer are coming on and working, but after a while it all shuts down. Because the fans are coming on and staying on for while, I don't believe it is a fan issue. They turn freely when off. So, could that be the circuit board is bad? Any tips, suggestions are very welcome!



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#2 RegUS_PatOff

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Posted 12 June 2013 - 05:44 PM

... Both fans in freezer are coming on and working,

stays running at the rated speed ?

Er FF
It is caused when F/B signal isn’t over 115 seconds during BLDC FAN motor operating
Poor BLDC Motor connection, DRIVE IC, and TR
 
The feedback signal isn't being seen by the Controller.
Either a bad Fan Motor, OR Controller


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#3 blairville

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Posted 12 June 2013 - 10:17 PM

Fan motor is working when first turning on and works for several hours afterwards. Then it shuts off, then the error. The motor is turning freely. So I think it is a bad control board. Is that the same as the controller? Thanks for the help by the way.



#4 Samurai Appliance Repair Man

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Posted 13 June 2013 - 08:25 AM

The muthaboard may be killing power to the evap fan because it's getting a bad feedback signal from the fan.  This can be caused by things external to the fan motor (ice blockage, etc.) or internal (bad winding, bad bearings, etc.).  Without being able to read and interpret the feedback line from the fan motor, you're left trying to deduce whether it's the muthaboard or fan motor.  In these cases, absent any more detailed info from the manufacturers (schematics, specs, service bulletins, etc.) I'll do like I do on GE refrigerators: replace BOTH the affected fan and the muthaboard.  I will not just replace the muthaboard because a bad fan motor (especially internally shorting from water seepage) can take out the muthaboard.  However, If the fan motor is clearly bad, you can replace just the fan motor without the muthaboard because the muthaboard cannot damage the new fan motor.  

 

Evap Fan:  http://www.repaircli...mber=LFX25960ST

 

 

Muthaboard:  http://www.repaircli...mber=LFX25960ST



#5 blairville

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Posted 13 June 2013 - 06:11 PM

I got the service manual from this site, Thanks so much, and did the test mode. Link to download service manual, if anybody felt froggy. http://appliantology...service-manual/

 

There are four steps, first starts it, second closes the damper, third shuts off compressor, closes damper and force starts the defrost. Steps one and two went off without a hitch. Third, the compressor and damper closed like it was supposed to, don't know if the heater was working, still trying to see where to check that at, but the display was supposed to show 33 33, but it did not. It showed the regular display. pushed button again, it made the display go like it was supposed to in step no. 1. and compressor stayed off like it was supposed to, there is a seven minute delay.

 

Does that further confirm that the board is bad?






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