Low water pressure can be very problematic when it comes to icemaker/water dispenser water inlet valves. If there is low water pressure to the valve, the valve may not seat correctly causing icemaker fill tubes to freeze, icemakers to over/under fill or water dispensers to leak or not shut off fast enough. Check the water pressure to the valve like this:
Turn off the water supply to the refrigerator and remove the water supply line from the water inlet valve behind the refrigerator.
Put the end of the water line in a bucket and turn the water supply on. There should be a good stream of water jetting from the tube. If there is not, the water supply shut off valve is probably plugged and needs to be replaced or there could be an in-line water filter that needs to be replaced. Only use a drill style (non-self piercing) saddle valve
http://www.repairclinic.com/SSPartDetail.aspx?s=t-584723-%3d%3di584723&PartID=584723 for the water supply.
If there is a good stream, the water inlet valve that the water line connects to at the back of the refrigerator should be replaced.
*Note: Reverse Osmosis (R/O) systems should never be used to supply water to icemakers.
TheRepairGuru --- www.repairclinic.com
How does a saddle valve work,, I was lead to believe it operates like a butterfly valve that you make a quarter turn it shuts the water off.
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