Into the cabinet
Water inlet valve
The solenoid that opens for a measured number of seconds and decides how full the mould gets.
- What it does
- It is the tap the machine operates for itself. A coil pulls a plunger off a seat for a fixed number of seconds, water passes a fine screen and goes down the fill tube, and the coil drops out again. Nothing measures the water that arrives: the fill is a length of time, so anything that slows the flow shortens the cube.
- Where it sits
- On the water side of the cabinet rather than in the freezer — at the back of a built-in behind the lower panel, or in the machine compartment of an undercounter unit, with the house line arriving on a compression fitting and a short run of tubing leaving for the fill tube.
- How it is tested
- Voltage at the coil while the ice maker calls for water, so that a valve which is never told to open is not blamed for not opening. Then the coil's resistance with the power off, the screen out and under a light, and a measured fill caught in a cup rather than judged by eye. A valve that buzzes and passes nothing has usually had its screen blocked for months.
- What the work costs
- Ice maker, water valve or supply line: $300–$820, after the flat $89 diagnosis.
Pattern
What we usually find
- The inlet screen furred with mineral. It is the first thing hard water reaches and the cheapest thing to rule in or out.
- A coil that has gone open circuit, so the valve is silent, the mould stays dry and the module keeps waiting for a fill that never comes.
- A valve opening but not fully, which reads as hollow or undersized cubes for weeks before anyone calls it a fault.
- Supply pressure below what the model wants, which makes a sound valve look like a failing one and is the reason the line gets measured first.
Most often first. Order comes from what the visits keep turning up, not from a count.
Almost everything blamed on a Sub-Zero ice maker module happens here instead. The module can only work with the water it is handed, and this is the part that hands it over.
The consequence worth knowing: because the fill is timed rather than measured, a slow supply and a small cube are the same event. Fix the flow and the cube comes back without anything inside the freezer being touched.
Repair or replace
What usually happens to it
Replaced, not repaired. The seat, the plunger and the screen are one sealed assembly, and a valve that has metered hard water for years is marginal even after the screen is cleaned. Cleaning is worth doing on the visit because it proves what the fault was, but it is a diagnosis, not the fix, and it is quoted as a replacement when the measured fill does not come back.
Two follow-ups
The valve hums but no water comes through. Is it dead?
Not necessarily. A hum means the coil is energised and doing its job, so the blockage is mechanical: a furred screen, a closed shut-off, or a line pinched behind the cabinet. Denver Sub-Zero Repair Experts measures the pressure at the fitting before condemning a valve that is trying.
Can I just clean the screen myself?
Reaching it means pulling the unit out and taking the water line off a live supply, so it is not on the owner list. Shut the water off, check the ice has genuinely stopped, and leave the fitting alone. Every screen we take out goes back with a measured fill to prove it.