Symptom · ice maker, fill tube, inlet valve, filter
Below Mount Tamalpais, the most common ice complaints we get are slow production, cubes that come out hollow or small, and an ice maker that has simply stopped. On a Sub-Zero built-in or undercounter unit this is usually a water-side problem — inlet valve, a frozen fill tube, a tired filter or the module itself — and it is very fixable without touching the sealed system.
Occasionally an ice problem rides along with something larger, like a door gasket leak letting humid air frost the compartment, or a genuine sealed-system suspicion that needs EPA-compliant verification. We can’t know which from a description alone; the fill volume and cycle timing, measured on-site, are what separate a $300 water-side fix from anything bigger.
Quick answer
Slow, hollow or stopped ice on a Sub-Zero is usually the water side: inlet valve, fill-tube frost, filter or module. We measure fill volume and cycle timing on-site to confirm it, then fit the OEM part. It rarely involves the compressor.
Likely causes, simple to expensive
This ranked order is the useful part: most Mill Valley ice calls resolve in the first three rows, well short of anything dramatic.
Access & proof
CABINET-SAFESome inlet-valve and line repairs sit behind the cabinet, which raises the built-in cabinet removal/reseat question — especially in the tight kitchens along Throckmorton Avenue. We treat that as a planned step and document it: the model-tag image, the temperature readings that rule the sealed system in or out, condenser/evaporator photos where relevant, and the OEM valve or module evidence. You see what we saw, and the cabinetry is protected on the way in and out. More on the cabinet-safe service page.
Mill Valley price ranges
Mill Valley ranges for Sub-Zero ice makers and water lines. Hollow or slow cubes are usually a water-volume problem, not a cooling fault.
| Service / symptom | What is included | Price range | Time on site |
|---|---|---|---|
| Diagnostic visit | Water-volume, inlet valve, fill tube, filter and module-cycle checks | $165–$245 | 45–90 min |
| Water inlet valve (OEM) | Valve test, OEM replacement and fill-volume re-check | $290–$540 | 1–2 hr |
| Fill tube de-ice & routing fix | Clear a frozen fill tube and correct the routing | $180–$360 | 1 hr |
| Ice maker module / ejector assembly | Module diagnosis and OEM replacement | $340–$760 | 1–2 hr |
| Water filter + line flush | OEM filter and supply-line flush | $95–$210 | 30–60 min |
| Water line / shutoff (salt-air corrosion) | Corroded supply line or shutoff repair | $260–$580 | 1–3 hr |
What sets the final price: whether it is the inlet valve, fill tube, filter or module; built-in versus undercounter routing; and any salt-air corrosion on the supply line.
Step by step
These quick owner checks separate a cheap water-volume fix from a module repair before we arrive in Mill Valley.
Fast facts
Ice maker pricing and timing
| Cause | Evidence | Planning range | Typical time |
|---|---|---|---|
| Filter or flow restriction | Low fill volume, old filter date | Usually inside $275–$850 | 1-2 hours |
| Weak inlet valve | Measured fill volume below spec | $275–$850 | 1-3 hours |
| Frozen fill tube | No water reaching mold, ice plug visible | $275–$850 after cause is found | 1-3 hours |
| Module or ejector fault | Cycle stalls or gears fail | $275–$850 depending on model | 1-3 hours |
| Temperature issue behind ice symptom | Freezer or fresh-food readings out of range | Start with $150–$230 diagnosis | Depends on measured fault |
A hollow-cube complaint is useful because it usually points to water volume, not compressor health. Have the model tag, a photo of the ice pattern and the last filter-change date ready if known. If cabinet temperatures are also drifting, have those readings ready too so the visit does not treat an airflow problem as a standalone ice maker issue.
Reviews
“BI-42 ice maker making hollow, slow cubes for weeks. Turned out to be a weak water inlet valve and a frosted fill tube — not the cooling system. Replaced both in Tam Valley for $365, solid cubes on the next cycle.”
— Rebecca N., Tam Valley 94941“Undercounter ice maker stopped harvesting in Sausalito. They replaced the ejector module and flushed the line — $480 and one visit, perfect ice since.”
— Tom K., Sausalito 94965“Hollow cubes after we let the filter go too long. Fresh filter and a line flush for $160, and the cubes filled back out. Quick visit in Strawberry.”
— Dana P., Strawberry 94941Have the model number ready and tell us what the ice maker is doing. We’ll bring the common water-side parts for your Sub-Zero line and confirm the fix on-site.
Ice & water questions
Hollow or small cubes almost always mean the mold is not getting enough water per cycle — a tired filter, a weak inlet valve, or a partially frozen fill tube. We measure the fill volume to confirm which, then fit the OEM part.
Rarely. A complete stop is usually the module, the inlet valve or a frozen fill tube. The freezer holding temperature while ice production stops points away from the sealed system.
Stop and call. Pooling water can damage flooring and cabinetry quickly, even when the appliance itself is fine. It is often a clogged or frozen drain line, which is a straightforward clean-out.
We stock the common inlet valves and modules and confirm the exact variant against your serial number before the visit when the model number is available.
Typically $95–$760: a filter-and-flush at the low end, an OEM inlet valve $290–$540, or an ice-maker module $340–$760. A logged diagnosis ($165–$245) is credited to the repair.
Indirectly. Near the bay in Strawberry and Sausalito, salt air corrodes water shutoffs and supply lines, which can starve the ice maker; that line repair runs $260–$580, separate from the ice maker itself.
