I've been puzzling over the problem for a couple of hours now, where my fridge has very low water pressure at the outlet of the ice maker supply line.
The line is 1/4 in copper and uses a 1/4 outlet on the sink cold supply as its source, with an in-line 1/4 needle valve (no saddle valve). The line presumably runs through the attic.
Water pressure at the sink is fine.
Water pressure on both sides of the needle valve is fine (I replaced it anyway because the seals started leaking when I fooled around with it).
Water pressure at the back of the fridge is almost nothing.
What has me puzzled is that if I disconnect both ends of the copper line, water seems to flow out of the line without much restriction. I'd expect it to dribble out, but it seems to flow normally.
After hooking the line back up… no pressure.
What am I missing?
Update: I replaced the fridge with a new unit (due to a presumably unrelated compressor failure) and the problem persists. Looks like I need to run a new line.
Best Answer
When you talk of bad flow at the refrigerator ice maker I am assuming you are looking after the fill valve of the fridge .. because an open ended copper pipe should flow plenty of water - if the pipe has no restriction (clog or kinked).
If that is fine and you are checking at the fridge valve: