""Sub-Zero 700 series β ice maker producing hollow cubes, dispenser slow""
Sub-Zero 700 series built-in β ice maker running but producing hollow, partially-formed cubes; water dispenser flow reduced. Two-part issue: water filter 20 months past the 6-month replacement cycle, and the water inlet valve diaphragm was showing early failure signs from the restricted flow. Replaced the filter, replaced the inlet valve with an OEM Sub-Zero part, ran three ice maker cycles to verify output. The filter replacement alone would have bought time, but the valve was already strained β we addressed both. This is the correct call at that filter age.