Slow ice, a jammed mold, or hollow cubes that crumble in the glass

It is worth splitting the complaint, because "the ice maker isn't working" covers two different failures. No ice at all — an empty bin, a fill cycle you can hear with nothing to show, or a maker that never starts — points hardest at the water getting in: a closed saddle valve, a spent filter, an inlet valve that won't open, or, on the colder end, a module that has stopped cycling. Slow, hollow or clumped ice — cubes that arrive but come out thin, half-formed, or fused into a single block — points at water arriving but not enough of it, or harvesting at the wrong moment: a scaled fill tube, a weak valve, low pressure, or a thermistor timing the eject badly. Both live on the same water path, so they share this page rather than competing for two; the diagnosis simply starts at a different rung of the ranked list below.

The thread running through almost all of it is the local water. If your cubes are cloudy, shrinking or off-tasting, read how Los Altos Hills hard water clogs ice makers — it explains the filter cadence that prevents most of these calls. And if you are also finding water pooling or leaking from the fridge, that is frequently the same hard water working on the inlet valve or the defrost drain, so the two are worth diagnosing together.

A wine column or wine-storage drawer that drifts a few degrees off its set point is a close cousin of these ice faults, and worth a plain explanation because owners often notice it on the same call. A column set to 55°F creeping to 60°F is usually a thermistor reading the cabinet wrong, an evaporator fan slowing down, or a control board acting on a bad number — not the wine going bad and not a dead unit. What confirms it is logging the actual cabinet temperature against the set point over a full cycle and reading the thermistor's resistance, not trusting the front-panel number. The honest limit: from your description we can rank the likely cause, but we cannot tell a marginal valve from a failing module, or a drifting thermistor from a tired fan, until we measure on site. That's why we quote after diagnosis, not before.

Two local realities shape these visits. First, the water itself: many homes in the 94022 pocket near Foothill College run hard or well-influenced water, which scales filters and inlet valves faster than the maker's manual assumes — so a filter that should last a year is spent in months, and the slow-ice complaint here is more often a flow problem than a failed part. Second, integrated cabinetry: in panel-ready columns and undercounter drawers the water shutoff, filter and inlet valve all sit behind custom fronts, so a leaking valve isn't just an ice problem, it's a millwork problem. We plan access before we touch the unit, because on these built-ins the cabinetry is part of the repair, not an afterthought. Out toward Hidden Villa, where parcels are rural and a service window is a real half-day commitment, we confirm the water-supply setup over the phone first so the right filter and valve are on the truck and the visit isn't lost to a second trip.

When an ice fault has survived the cheap fixes and the display is throwing an alarm, we don't reach for the most expensive part first. We read the control board, thermistor or display alarm against the model and serial — not a universal code chart — and we back it with evidence: temperature readings in the freezer and at the mold, condenser and evaporator photos to rule out a frost or airflow problem masquerading as an ice fault, model-tag proof so the part matches the unit, and the OEM valve, module or control-board packaging kept as a record of exactly what went in. A board or thermistor reading wrong can mimic a dead module; metering the board's output to the ice circuit is what tells them apart. Parts are genuine OEM matched to your serial, the invoice names the part and the labor, and a workmanship warranty covers the repair. We don't use 'best parts' language — the serial number, not an adjective, picks the part.