GE Profile 15-in undercounter nugget ice maker (UNC15NJII, UNC15NPRII): quick sheet

Covers: GE Profile UNC15 built-in / freestanding 15 in nugget ice makers: UNC15NJII (panel-ready, gravity drain) and UNC15NPRII (stainless) and close revisions. The clear-cube sibling UCC15 shares the Time to Clean reminder but is a different (cube) machine. UNC15NJII is listed as discontinued by some dealers.

Cross-checkedBrands: GE Profile7 components

A residential undercounter nugget (chewable) ice machine: an auger in a refrigerated cylinder freezes water and extrudes soft nugget ice into a 26 lb bin. Status shows on a few lights rather than codes: Check Water (flashing red) for no water, all lights flashing for an auger fault, and a yellow Time to Clean reminder. Gravity drain is standard; an optional pump kit is needed where there is no floor drain below the unit.

Safety first

Unplug before reaching into the auger area or removing panels.
Sealed system is refer-only (EPA 608).
Use only the cleaner the manual specifies; follow the manual, not the bottle.

How it works

Water enters through an inlet valve / float to a reservoir that feeds the freezing cylinder. A gearmotor turns an auger inside the refrigerated cylinder; ice forms on the cylinder wall, the auger scrapes it up and it is compressed into nuggets that fall into the bin.

The bin fill sensor stops production when the bin is full and restarts it as ice is used.

If the control sees no water it flashes Check Water and rechecks about every 20 minutes, resuming on its own once water is restored. If the auger motor is not turning or is overloaded, all lights flash; GE's reset is pressing ON/OFF.

Scale and ice binding load the auger. The Time to Clean light comes on after about 6 months of use and stays on until the clean/descale routine is done; hard water shortens the interval.

Melt and drain water leave by gravity through a drain designed to prevent backflow into the bin. If the drain is not below the unit, an optional pump kit is required.

Components & tests

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Official manufacturer documentation

Always confirm values against the tech sheet for the exact model.

OnCall Tech is a reference tool for trained technicians and can make mistakes. Always disconnect power and confirm with the manufacturer's documentation before you work. © 2026 OnCall Tech. Original content; not a reproduction of any manufacturer document.Generic part photos (not of this brand): Main electrical panel beside a subpanel with its cover removed by Gvolk, CC BY-SA 3.0

Diagnostic guides for this appliance

Guide · Ice Maker

Refrigerator ice maker making small, thin or hollow cubes

In a refrigerator ice maker this is almost always a water-supply problem: low pressure, a clogged or badly seated filter, a kinked line or a reverse-osmosis system starving the valve. Low fill means the mold or tray doesn't fill. On Whirlpool-style ice makers the last cavity, next to the thermostat, starves first and triggers an early harvest. Fix the supply before replacing parts.

8 steps ~30 mineasy

Guide · Ice Maker

Refrigerator ice maker freezes cubes but won't harvest

Rule out the simple stops first: the shutoff arm or bin sensor, the On/Off control and a warm freezer. Then force a harvest with the ice maker's own test (T-H jumper on Whirlpool modules, three arm presses on GE, the Test button on Samsung and LG). If the forced harvest works, the ice maker is fine and the trigger (thermostat/thermistor or temperature) is the issue. If it doesn't, the ice maker usually gets replaced.

7 steps ~30 mineasy

Guide · Ice Maker

Ice maker fill tube frozen (no water reaches the ice maker)

Water freezes in the tube that feeds the ice maker. Thaw it with warm air, then find the cause or it will come back. The usual causes are a valve that seeps between fills, low pressure (slow fills freeze), a freezer set too cold, or cold air blowing on the tube. Replacing the valve is the most common lasting fix.

7 steps ~40 mineasy

Other ice makers manuals

Manual · Ice Maker

Whirlpool-built modular (crescent-cube) ice maker: field service manual

The Whirlpool-style modular freezer ice maker with a plastic module cover marked with test points (T, H, N, L), a metal mold with a heater, an ejector with fingers, and a wire shutoff arm. Used in many brands' freezers. Later Whirlpool electronic ice makers without test points are not covered here.

6 components5 common failuresWhirlpool, Maytag, KitchenAid, Amana, Kenmore (Whirlpool-built)

Manual · Ice Maker

GE electronic freezer ice maker (feeler-arm / paddle style): field service manual

GE's electronic crescent-cube ice maker used in GE freezers (side-by-side, top-mount and bottom-mount), with a feeler arm or paddle, an electronic control and thermistor, and on many versions an On/Off switch with a green LED. Covers the common replacement kit family that superseded older mechanical GE ice makers.

6 components5 common failuresGE, GE Profile, Hotpoint

Manual · Ice Maker

Samsung refrigerator ice makers (ice room, freezer and door): field service manual

Samsung twisting-tray ice makers: the fresh-food-door ice room on French-door and 4-door models, the side-by-side freezer-door ice maker, and freezer-mounted ice makers on top- and bottom-freezer models. Includes Samsung's test-button procedure and the ice-related error codes 14E, 39E/39C and 40E/40C.

6 components5 common failuresSamsung