If both the water in door and ice maker are experienceing slow water problems the common point is the water supply itself.
This can be caused by:
1. Water supply shut off valve is partially closed or blocked with debris.
a. TURN water supply OFF
b. Remove the water line from the rear of the refrigerator ABOVE the in line filter (if one is installed)
c. Place the removed line into a bucket.
d. Turn on water supply and check flow. It should fill an 8 Oz glass in about 8 seconds.
If it passes this test then the water supply is fine. If it FAILS this test either cflear the obstruction in the line or replace the water supply valve from the house connection.
Test 2 (Water supply is OK
Reconnect water supply to external in-line filter (If installed) or water valve assy connection.
Your unit has a Verticle filter that if it is clogged will cause slow water flow.
Test water thru the door for the same amount of water flow. It should fill an 8 Oz glass in 10 seconds or less.
If it does ot do this then the VERTICAL internal water filter is clogged. (5 months or 500 Gallon change interval)
REPLACEMENT filter is PN LT500P but there are several like / suitable aftermarket replacements for the LT500P number.
As for the ice maker freezing up. There is only one cause for this and that is the water valve assy itself is bypassing water when it is supposed to be closed. The only remedy for this is to replace the water valve. They are not repairable.
The valve is available through sears parts direct:
http://www.searspartsdirect.com/partsdirect/part-number/LG-Parts/Refrigerator-Parts/5221JA2006D/0046/795/Model-LSC26905TT/3204/0165000?keySuffixId=NA&productTypeId=x&searchModelNumber=LSC26905TT&subCompDesc=Ice/water%20parts&brandDesc=LG&modelDesc=REFRIGERATOR&blt=11
Thanks for choosing FixYa.
Kelly
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