Appliance Repair Jax is an independent appliance service company. We are not affiliated with, authorized by, or endorsed by Sub-Zero Group, Inc., or any other manufacturer named on this site. All brand names, model numbers and trademarks are the property of their respective owners and are used here only to identify the appliances we service.
UNDERCOUNTER · BUILT-IN · NUGGET
No ice, hollow cubes, or water pooling under the unit. We work through the whole chain from water pressure to the fill tube and the sealed system.
40-mile radius$129 diagnostic90-day labor warranty
Sound familiar?
An ice maker is a chain. Water leaves the house supply, passes a shut-off valve, passes a filter (sometimes two, if there is a whole-house unit nobody remembers), reaches an electric inlet valve, travels a fill tube, drops into a mold, freezes, gets ejected, and lands in a bin with its own level sensing. A break anywhere reads to the owner as “the ice maker is broken.” It usually is not.
The failures we actually find:
Water supply and filtration. Low pressure is the most under-diagnosed cause, and it announces itself with small or hollow cubes rather than with no ice at all. Right behind it is a filter that has done its job for two years and is now a restriction. Sub-Zero publishes filter part numbers by platform: 4204490 and 9030868 are twist-in filters covering Classic, Designer and PRO refrigeration, 7045454 is the current Classic push-in filter, and 7042803 is the NSF certified filter for the UC-15I undercounter ice maker.
A frozen fill tube. Water dribbles instead of filling, the tube ices closed from the tip back, and production stops entirely. This is common and it is fixable.
Temperature. The ice maker will not run if the freezer is not cold enough. Sub-Zero’s threshold is at or below 5°F, and they recommend 0°F. A freezer sitting at 12°F because its condenser is packed with dust will make no ice at all, and swapping the ice maker will change nothing.
The mechanical bits. A shut-off arm left in the up position, a missing white plastic rudder arm, a bin that is not seated level, or a jam from cubes that fused during a slow cycle. These are cheap failures with a large nuisance value.
The sealed system, on standalone undercounter machines. A UC-15I is a self-contained refrigeration unit rated to produce up to 50 pounds of ice a day and store 25 pounds, drawing 115 VAC on a dedicated 15 amp circuit. When its compressor or evaporator fails, it needs a refrigeration technician, not an appliance parts swap.
We work the chain in order rather than starting at the ice maker, because starting at the ice maker is how people end up paying for a module that was never the problem.
Water pressure and flow at the unit come first, measured, not guessed. Then the filter, its age and its seating. Then the inlet valve — coil resistance and actual fill volume on a timed cycle. Then the fill tube for ice. Then freezer temperature taken with our own probe rather than off the display, and if it is high we go look at the condenser before anything else.
Only after all of that do we test the ice maker itself: module, mold heater, thermostat or thermistor, ejector, shut-off arm and bin sensing. On a standalone undercounter machine we add condenser condition, fan draw, drain routing and pump function, and where warranted, sealed system pressures.
Most ice maker jobs finish on the first visit. Inlet valves, fill tube heaters, filters, rudder arms and shut-off arms are small parts and we carry the common ones. A frozen fill tube is cleared with controlled warmth, never with a screwdriver or boiling water — puncturing a fill tube or a drain heater turns a one-hour visit into a much larger repair.
Undercounter machines usually have to come out of the cutout, which exposes the surrounding cabinetry, the toe kick and the floor. In a Fruit Cove bar area that stone or wood floor is worth more than the machine, so it gets protected before anything moves. Plumbed units get their supply and drain reconnected and pressure-checked, and we run a full harvest cycle so you see ice before we leave.
Sealed system repairs on undercounter ice machines are performed in your home by EPA Section 608 certified technicians. The EPA classifies under-the-counter ice makers as small appliances, so that certification is a federal requirement, not a marketing line.
For an ice maker built into a Sub-Zero refrigerator, the answer is nearly always yes. The parts are inexpensive relative to the cabinet they live in, and none of the failure implicates the refrigerator itself.
For a standalone undercounter machine, the deciding factor is whether the sealed system is intact. Valves, pumps, fans, boards and thermostats are all straightforward repairs on a unit that is otherwise sound, and a well-kept undercounter machine runs for well over a decade. A compressor failure on a fifteen-year-old machine is a closer call, and we will give you the honest arithmetic rather than the arithmetic that favors us.
One thing worth doing either way: if the unit is plumbed and drains to a pump, check the drain routing annually. Most of the water damage we get called to in bar and pantry installations traces back to a drain, not to a refrigeration fault.
Brands
Ultra luxury United States (Madison, Wisconsin)
Sub-Zero is our flagship specialty. Dual refrigeration, sealed-system work, legacy BI and IT columns, and the 400 Series wine cabinets nobody else wants to open.
Luxury United States (Greenwood, Mississippi)
Viking created the professional-style home range. We service the ranges and rangetops, plus the built-in refrigeration, ventilation and dishwashers that go with them.
Luxury United States
GE Appliances' luxury line, sold through design showrooms. We repair Monogram built-in and integrated refrigeration, Professional ranges, Advantium speed ovens, hoods and dishwashers.
Luxury United States
Whirlpool's luxury brand and the originator of the downdraft range. We repair JennAir wall ovens, pro-style ranges, cooktops, built-in refrigeration and dishwashers.
Luxury United States
Samsung-backed American brand founded in Pasadena. We repair Dacor Modernist, Professional and Contemporary cooking and refrigeration, plus legacy Epicure and Renaissance equipment.
Luxury New Zealand
New Zealand brand, Haier-owned, spanning refrigeration, cooking, dishwashing and laundry. We repair DishDrawer, CoolDrawer, ActiveSmart and Series 9 integrated units.
Luxury Germany
Liebherr builds refrigeration and nothing else. We service the Monolith columns, integrated units, BioFresh compartments and the wine cabinets, including sealed-system work.
Ultra luxury United States
True builds commercial refrigeration for the home. We service the columns, undercounter cabinets, wine reserves and clear ice machines that go with it.
Luxury United States
Perlick brings bar-industry hardware into the home. We service the undercounter refrigerators, wine reserves, beverage centers and outdoor units built on it.
Premium United States
U-Line is the most common undercounter brand in Northeast Florida bars, pantries and outdoor kitchens. We repair the refrigeration, wine and ice models.
Luxury United States
Marvel has built undercounter refrigeration since 1892. We service the indoor and outdoor cabinets, wine cellars, refrigerated drawers and crescent ice machines.
Premium United States
Scotsman builds the nugget and gourmet ice machines in high-end bars, pantries and outdoor kitchens. We diagnose water path, airflow, auger and control faults.
Try this first
Some of it you can genuinely sort out yourself in ten minutes. We would rather you did than paid us to.
Maintenance
Month by month, by appliance type, tuned to Northeast Florida pollen, humidity and storm season. What genuinely extends appliance life and what does nothing.
Troubleshooting
Work it in the order that eliminates whole categories: freezer temperature first, then water supply, then the ice maker itself. Cross-brand diagnostics.
Installation Pro only
A built-in is cabinetry, not an appliance you roll out. What a service pull really involves, what gets damaged when it is rushed, and how to prepare for one.
A full 24 hours after a power interruption, a filter change or a temperature change. The freezer has to reach temperature before the ice maker will cycle at all, and Sub-Zero specifies the freezer must be at or below 5°F, with 0°F recommended. Judging it at hour six will send you down the wrong path.
That specific symptom points at low water pressure, not at the ice maker itself. Sub-Zero calls this out directly. The usual causes are a partially closed supply valve, a clogged or expired water filter, an expired whole-house filter nobody has changed, or genuinely low pressure at the house, which is a plumber's job rather than ours.
Often it is not. The chain runs from the house supply valve through the filter, the inlet valve, the fill tube, the mold and the ejector, and any link breaks the whole thing. A frozen fill tube and an expired filter are both more common than a failed ice maker module. We test the chain in order rather than replacing the obvious part first.
Yes. Undercounter ice machines are a large part of this work, including the Sub-Zero UC-15I and UC-15IP with drain pump, the older 315I, and units from Scotsman, U-Line, Perlick, Marvel and True Residential. These are sealed refrigeration systems and fall under EPA Section 608, which our technicians hold.
The usual causes are a blocked or misrouted drain line, a failed drain pump on a pumped installation, a leaking inlet valve, or a fill tube that overshoots the mold and spills. On an undercounter unit the water often tracks under the cabinet before it appears, so what you see on the floor is rarely where the leak starts.
We would not. Filters are model-specific, and the wrong housing fit causes bypass, leaks or restricted flow that starves the ice maker. Sub-Zero publishes its own part numbers, including 7042803 for the UC-15I undercounter ice maker, and we install genuine OEM filters rather than aftermarket equivalents.
Customer feedback
Rated 4.8 out of 5 across 72 customer reviews. These three describe this job in particular.
Ingrid W.Mar 12, 2026
The unit was freezing into one solid block instead of separate cubes. He adjusted the fill volume, replaced a tired mould heater and explained how the bin thermostat decides when to stop. No more block ice.
Harriet N.Apr 23, 2026
The nugget machine had slowed to a trickle and the ice came out cloudy. He descaled the whole water circuit, changed the filter cartridge and cleaned the reservoir. Production was back where it should be within a day.
Wren B.Jul 8, 2026
There was a slow drip from underneath onto the cabinet floor. He traced it to a split in the drain hose behind the unit rather than the pump everyone assumed, replaced the hose and sealed the grommet properly.
Where we do this work
Talk to a technician
Read us the model and serial number off the data plate along with what it is doing. That is usually enough for us to tell you what we expect to find.