Sub-Zero ice maker repair in Woodside? We fix it.

• Ice maker switched off, paused, or locked out. The control can stop ice in ways that look like a broken part. The first two no-ice causes in Sub-Zero's built-in (BI) service manual are the ice maker switched off and the shut-off arm left up. The control also pauses the ice maker for 45 minutes after every harvest, turns it off in Sabbath mode, and won't run more than 20 harvests in a row between door openings. If the water valve stays open longer than 35 seconds, the ice maker shuts down for 24 hours. After 5 of those in a row, the ICE and service icons flash and the ice maker stays off until the cause is fixed and the fault is cleared.
• Water isn't reaching the mold. The manual's water list is short: the supply turned off, a pinched, kinked or clogged line, a saddle valve installed wrong or not fully open, water frozen in the inlet tube, loose wiring, or a failed water valve. A heater keeps the fill tube clear the whole time the ice maker is on, so a frozen tube means testing that heater circuit, not just thawing the ice. Each fill is only about 3.5 oz of water, and the manual also ties small or hollow cubes to a water supply that isn't steady.
• Water filter overdue, removed, or paired with reverse osmosis. Sub-Zero says to replace the filter when the reminder shows, when water pressure drops, when cubes turn hollow, or every 12 months, whichever comes first. It's certified for up to 750 gallons. Depending on when a BI unit was built, it shuts the ice maker off whenever the filter or the filter bypass plug is removed, so pulling the filter to test it can stop ice completely. With a reverse osmosis system, Sub-Zero recommends bypassing the filter, and the RO system has to deliver a constant 30 to 100 psi at all times.
• Freezer too warm or airflow blocked. The ice maker only starts a harvest when its thermostat closes at about 15°F, give or take 3 degrees. A warm freezer means slow ice or none. Sub-Zero's owner checklist says the freezer should be near 0°F, and the service table lists poor airflow over the ice maker as a separate cause. If the whole freezer is warm, the ice maker is only the symptom and the cooling problem gets fixed first.
• Ice maker assembly failed. On Sub-Zero built-ins the ice maker is replaced as one assembly. The service manual says its individual components aren't available for service. Before ordering one, a technician tests the motor, the thermostat, the mold heater and the internal switches, and checks the wiring and the power coming from the control board. A cube jam or a tripped thermal cutout can also stop the ejector, and the manual says to fix that cause first.
• Small, hollow, or discolored cubes. For hollow or small cubes the BI manual lists an ice maker or cabinet that isn't level, an unsteady water supply, the thermostat, and the fill signal from the control board. The owner guide adds a dirty condenser and an old filter. Blue or green ice points to corrosion in a copper supply line, which Sub-Zero sends to a plumber. Black flecks in the cubes mean stop using the ice and book service.

Sources and standards: ENERGY STAR: refrigerator energy use and certified product specs

• Why is my Sub-Zero not making ice?

  Usually because water isn't reaching the mold or the freezer isn't cold enough to start a harvest. Start with Sub-Zero's own checklist on this page: the ice icon showing, at least 24 hours since the ice maker was turned on, a freezer near 0°F, the bin seated, the arm down, water supplied, and a filter changed in the last 12 months. If all of that checks out, the cause is a valve, the fill tube heater, the ice maker assembly or the control, and that takes testing.
• My Sub-Zero dispenses water but makes no ice. What does that mean?

  If the dispenser works, water is reaching the unit, so the fault sits closer to the ice maker. On built-in models the control powers the ice maker's water valve on its own circuit. The usual suspects are a frozen fill tube, that valve or its wiring, the ice maker assembly, or a freezer running too warm. A technician sorts it out by watching a cycle and metering each part.
• How long does a Sub-Zero take to start making ice?

  Sub-Zero's checklist asks you to give the ice maker at least 24 hours after it's turned on, and the owner guide says to throw out the first few batches. The control also waits 45 minutes after every harvest before the next one, so a slow first day is normal.
• Can I reset the ice maker myself?

  You can switch it off and back on from the control panel, as the owner guide shows. On BI models that also skips the 45-minute pause after a harvest. It won't clear a lockout. If the ICE and service icons flash, the control has shut the ice maker off after repeated long fills, and the cause has to be found before the fault is cleared. For codes on the display, see our Sub-Zero error codes guide.
• Is my Sub-Zero still under the factory warranty?

  Sub-Zero's current Classic guide lists a full 2-year warranty, a full 5-year sealed system warranty, and a limited 12-year sealed system warranty, counted from the install date. If your unit is inside that window, call Sub-Zero first, because warranty work goes through Sub-Zero Factory Certified Service. We're an independent Sub-Zero specialist, not a dealer, and we take the out-of-warranty repairs. The $99 diagnostic is credited toward the repair.
• Are you local?

  We're based in San Ramon and work across the Tri-Valley and the wider Bay Area. Call (925) 999-4095 to book. The $99 diagnostic is credited toward the repair, and you get a written quote before any work starts.

• Portola Valley
• Menlo Park
• Atherton