LFX25950 refrigerator icemaker Not Producing Ice

[dad4patmic]

Hi-  A few days ago we noticed the refrigerator was not keeping things frozen and was warming up inside the refrigerator.  I unplugged the box, and vacuumed the dust that had accumulated near on the back of the box near water line.  After this the box seemed to recover.  The freezer and refrigerator are working as expected.  The only problem is the Icemaker.  The problem seems to be the water supply.  The water dispenser works fine, but I don't see any water in the ice cube tray. I was hoping to find a way to determine what is at fault. 
Thanks in advance!

LFX25950

[AJ]

What is the temperature in the freezer?

LFX25950 LG Refrigerator Service Manual

[dad4patmic]

Measured 6 degrees F.

[AJ]

I have attached a few sheets from the service manual about the operation principle and repair method of a LG ice maker.

Take a look at it and see if that helps you.

Let us know what you find or if you have any other questions.
I don't work on LG myself, but some other techs on our site do.


LG IceMaker Assembly Part # AEQ36756901

[clman]

Most commonly the ice maker needs to be reset or replaced. There are a few other variables like cabinet wiring and water line issues which are pretty rare.

Usually I have the customer turn the unit off and back on then add water to the ice mold ( if it's empty ) and see if it cycles and how many times it drops; if it does cycle. If the ice mold is full and frozen I do a power reset and then a test mode cycle.

TEST MODE: Make sure the ice maker power ( rocker switch in "I" position ) is on. If the green cube size leds are lit on the face of the ice maker push and hold the ice cube size button until the ice maker begins a test cycle ( 3-10 sec ). The row of fingers above the mold ( where the water is held and turned into cubes ) began to rotate. At the end of the cycle, *when the fingers come back near their original position, it should fill with water.
( * Sometimes an IM will fail leaving the fingers in a position other than where they should be at the end of the cycle. On this type IM the fingers are supposed to rest slightly above the edge of the ice mold portion of the IM body on the side facing you ).

If the switch is on but the lights are not lit the IM is dead.

If it cycles but does not fill, move on to checking for 115v at the water valve when test cycling the IM again. If no voltage is ever present suspect the IM. If voltage is present make sure water is flowing through the valve by disconnecting the output side water line when testing. Voltage present but no water flow = bad water valve.

If no voltage is present at the water valve and the IM leds are lit: The water valve relay is on the M.PCB but is digitally told to actuate by the IM pcb. The water valve terminal at connector 3 / pin 3 and a common should read 115v when the IM is at the fill position. If 115v is not present either the M.PCB or the IM is at fault. Since the IM communicates with M.PCB digitally there is no way to test this communication with basic tools. At this point it becomes an educated guess. Ice maker failures are very common on LG refrigerators and would be my choice to replace.

[dad4patmic]

If it cycles but does not fill, move on to checking for 115v at the water valve when test cycling the IM again. If no voltage is ever present suspect the IM. If voltage is present make sure water is flowing through the valve by disconnecting the output side water line when testing. Voltage present but no water flow = bad water valve.

If no voltage is present at the water valve and the IM leds are lit: The water valve relay is on the M.PCB but is digitally told to actuate by the IM pcb. The water valve terminal at connector 3 / pin 3 and a common should read 115v when the IM is at the fill position. If 115v is not present either the M.PCB or the IM is at fault. Since the IM communicates with M.PCB digitally there is no way to test this communication with basic tools. At this point it becomes an educated guess. Ice maker failures are very common on LG refrigerators and would be my choice to replace.

Thanks for the reply.  Is testing the water valve tricky?  I have the repair manual, but need to find out where to test the water valve.
Thanks again

[clman]

You have to cycle the IM and wait for it to get to the fill position while holding teat leads on the valve connectors. This is the only way to be sure you are getting proper voltage to the valve. This will not tell you if the board is sending voltage to the valve; You can apply 115V directly to the valve to verify that it is good both mechanically and electrically. Disconnect the water line going up the back of the refrigerator at the point that it enters the grommet going into the cabinet. Release it from the retaining clips along the length of the line and put it a pot or other type container to receive a few cups of water. Activate the valve either by cycling the IM or with a direct voltage source. See what happens.

Have you cycled the IM yet? If not - do it before getting more info.