Cold Line Refrigeration Service — (904) 604-7755 # Undercounter Series Service | UC-15I, UC-24R Independent undercounter service in Northeast Florida. UC-15I ice makers, UC-24R and UC-24C cabinets, gravity drains, filter 7042803 and blocked base grilles. Source: https://firstcoastsubzero.com/models/undercounter/ --- Setpoints 38°F Fresh food 5°F Ice production 0°F Freezer Series · UC # Undercounter series — UC-15I, UC-24R and UC-24C Undercounter cabinets breathe through one low grille and live in the hottest position in the kitchen, so airflow, drain geometry and duty cycle account for nearly all of their service calls. Current series 2000 onward Reviewed August 14, 2026 ![The inside of an undercounter drawer with the bin removed, the fill tube visible at the back wall.](https://firstcoastsubzero.com/img/ice-maker-06.webp) Undercounter and ice maker share a cabinet size and almost nothing else. Series data Undercounter series data | Series name| Undercounter | Plate prefix| UC | Production| 2000 onward | Condenser| Bottom-mounted | Sealed systems| Does not use the dual-refrigeration arrangement | Water filter| 7042803 Representative models - UC-15I - UC-24R - UC-24C Series notes and exceptions Undercounter exceptions | Condenser location| Bottom, behind the front grille | UC-15I drain| Gravity drain. The line must fall continuously to the connection | UC-15I water filter| 7042803, which replaced 7012333 | Ice production| Requires the compartment at or below 5°F, 0°F recommended | Sealed systems| One per cabinet Failure profile ## What this series actually presents with. Cabinet running warm in summer and recovering in cooler months Restricted base grille combined with high ambient in an island or outdoor position Water on the floor beneath a UC-15I Gravity drain line that has lost its fall, usually after cabinetry or plumbing work Wet, clumped or slow ice on a cabinet that is otherwise cold Fill or harvest fault in the ice system, not a refrigeration fault Drawer or door standing proud at one corner Panel weight and runner or hinge alignment Condenser fins soft and powdery on an outdoor unit Salt-air corrosion drawn in through the front grille in coastal ZIP codes The UC cabinets are the 15 and 24 inch units that go under counters, into islands, into butler’s pantries and, in this part of Florida, into outdoor kitchens under a lanai. The common ones here are the UC-15I ice maker, the UC-24R refrigerator and the UC-24C combination cabinet. They are simpler than a full-size built-in — one sealed system rather than two — and they fail more often, because of where they live. ## One grille, doing everything Every undercounter cabinet breathes at the base. The condenser sits behind the front grille and that single opening handles both intake and discharge. Nothing about the design is forgiving of restriction. The list of things that restrict it is short and entirely non-technical. A decorative toe-kick added during a refresh. A new floor with a thicker underlay that lifts the cabinetry and drops the clearance. A rug pushed up against the base. Trim run across the opening by a carpenter who did not know what it was for. Each of these raises head pressure, extends run time and eventually stops the cabinet holding setpoint. Clean the condenser every six to twelve months, every six with pets, and skip it entirely on a cabinet less than six months old. ## Ambient temperature is the other half An undercounter unit in an air-conditioned kitchen has an easy job. The same unit in an outdoor kitchen in Nocatee, Ponte Vedra Beach or Marsh Creek is working against ambient air in the nineties for four months of the year. Indoor-rated cabinets installed outdoors show a characteristic pattern: continuous run, a drift warm through the afternoon, recovery overnight, and complete recovery in November. No component replacement changes that. We measure the air at the grille before quoting anything, and where the answer is placement rather than parts we say so. ## The UC-15I gravity drain The UC-15I is a gravity-drain machine. The drain line must fall continuously from the cabinet to the connection. A line that has been re-routed during a cabinetry job, or that sags between joists, holds water and eventually overflows at the cabinet. Water on the floor under an undercounter ice maker is a plumbing geometry problem far more often than it is a failed part. We check the fall before we check anything else. ## Filters and the ice system The UC-15I takes water filter 7042803, which replaced 7012333. Different cabinets in the range take different cartridges, so the plate is read before a filter is ordered. The cartridge is a maintenance item rather than a repair part, and the reason to change it on schedule is flow. A saturated filter restricts the supply, and reduced supply on a machine with this duty cycle shows up quickly as thin, wet or undersized ice. An undercounter ice maker runs a small mold hard, so it reports a problem earlier than the main cabinet does. Wet or clumped ice on a cabinet that is otherwise cold is nearly always an ice-system fault rather than a refrigeration one, and it divides three ways: a short fill upstream of the mold, a harvest fault at the ejector or mold thermostat, or a diverted fill tube. They are separated by measuring the fill and reading the harvest cycle, not by replacing the module and hoping. ## Salt air Outdoor and near-coastal cabinets in 32082, 32250, 32266, 32233 and along the St. Augustine waterfront take a second kind of damage. Salt aerosol enters through the front grille with the cooling air and attacks aluminium fin stock, fasteners and hinge hardware. On a ten-year-old outdoor UC, corroded fins and a seized hinge are often the whole repair, and both are visible in the first ten minutes. ## Doors, drawers and the seal Undercounter doors and drawers carry custom panels and heavy handles on short runners. Alignment drifts. Most cabinets that will not seat need adjustment, not parts. There is no lock. The seal grips for a few seconds after closing because the trapped air has cooled and contracted, and it releases as pressure equalises. Forcing a door in that window is how gaskets get torn. ## Cost $80 flat diagnostic, credited toward the repair. Written estimate first. Genuine OEM parts, 90 days on labor, 365 days on parts. Repairs on this series - [Undercounter](https://firstcoastsubzero.com/repairs/undercounter/) - [Ice maker](https://firstcoastsubzero.com/repairs/ice-maker/) - [Refrigerator drawers](https://firstcoastsubzero.com/repairs/refrigerator-drawers/) - [Wine storage](https://firstcoastsubzero.com/repairs/wine-storage/) Related notes - [Why an ice maker stops, in the order we check it](https://firstcoastsubzero.com/notes/ice-maker-diagnosis/) - [Salt air, condensers and the coil you cannot clean](https://firstcoastsubzero.com/notes/salt-air-corrosion/) - [Condenser cleaning, and the 48°F rule](https://firstcoastsubzero.com/notes/condenser-cleaning/) Areas we cover - [Fruit Cove](https://firstcoastsubzero.com/areas/fruit-cove/) - [Nocatee](https://firstcoastsubzero.com/areas/nocatee/) - [Ponte Vedra Beach](https://firstcoastsubzero.com/areas/ponte-vedra-beach/) - [Mandarin](https://firstcoastsubzero.com/areas/mandarin/) Coverage 12 years limited sealed system, parts only. [What that means for you](https://firstcoastsubzero.com/warranty/). Independent service company ## Undercounter service Quote the full model and serial number from the plate. Sub-Zero control boards are serial-dependent, so we never confirm a board number from a description alone. $80 flat diagnostic, credited toward the repair. Mon–Fri 8am–6pm · Sat 9am–4pm · Sun closed. Scheduled appointments only. No after-hours or emergency service. [Call (904) 604-7755](tel:+19046047755) [Book online](https://nexfield.pro/crm/book?u=44) [Contact](https://firstcoastsubzero.com/contact/) 40 miles by road from Fruit Cove and St. Johns County. Drive distance, not straight-line radius. 90 days labor, 365 days parts, genuine OEM components. EPA Section 608 certified technicians — the federal requirement to open a sealed refrigeration system.