Outdoor ice merchandiser freezer with an ICE sign on top
7 components covered

Field manual · Ice Maker

Undercounter clear-ice machine: field service manual

Covers: 15-in residential undercounter clear-cube machines (gravity-drain and pump models); notes on Hoshizaki KM-style cubers. Generic platform; confirm with model data.

Cross-checkedBrands: GE, Whirlpool / KitchenAid, Scotsman, Hoshizaki, U-Line, Manitowoc7 components

A self-contained machine with a refrigerated evaporator, a water pan or reservoir with a recirculating pump, an insulated but unrefrigerated bin, and a drain (gravity or pump). Water flows over a cold plate so ice builds in clear layers, then a harvest releases it. Recognise it by the separate drain connection and a Clean/Check Water panel.

Safety first

  • Unplug and shut off water before service.
  • Sealed-system and hot gas valve body work is blocked: refer to an EPA 608-certified technician.

How it works

Freeze: the compressor chills the evaporator while a pump circulates water over it; minerals stay in the water, giving clear ice.

Harvest: the evaporator is warmed (hot gas on cubers like Hoshizaki, with the cycle ending by water level and a suction-line thermistor near 48°F) and ice drops into the bin; on some clear-ice designs a slab falls onto a heated cutter grid, which drips water into the bin during harvest (normal).

Leftover mineral-laden water is drained each cycle, which is why these machines need a drain.

A bin sensor or thermostat stops production when the bin is full; since the bin is not refrigerated, stored ice melts slowly and is replaced.

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): Outdoor ice merchandiser freezer with an ICE sign on top by Athena Sandrini, Pexels License

Diagnostic guides for this appliance

Guide · Ice Maker

Countertop ice maker shows 'Add Water' with water in the reservoir

These units detect water with a float, probe or wire sensor in the reservoir and a small pump that lifts water to the tray. Scale on the sensor, a blocked reservoir screen, a stuck float, very pure water or a weak pump can all trigger a false Add Water.

4 steps ~30 mineasy
Guide · Ice Maker

Undercounter ice maker: ice slab will not release or sticks on the cutting grid

Grid-cutter (slab) ice makers freeze a sheet, release it during harvest and let a heated wire grid cut it into cubes. Most release problems come from an unlevel cabinet, scale on the evaporator plate, or a cutting grid that is unplugged or not heating. Harvest switches and probes are next.

5 steps ~60 minmoderate
Guide · Ice Maker

Undercounter ice maker not making ice

Check power, water supply and pressure, drain (pump models stop when they cannot drain), bin sensor, cleaning status, condenser and room temperature. Scale is the most common cause on older machines.

7 steps ~60 minmoderate

Other ice makers manuals

Manual · Ice Maker

Countertop bullet & nugget ice makers: field service manual

Hand-filled countertop units: bullet/prong-type portables and auger-type nugget makers (Opal 1.0/2.0). Generic platform; confirm with model data.

6 components4 common failuresGE Profile Opal, Whynter, NewAir, Frigidaire, Danby
Manual · Ice Maker

GE Profile Opal 2.0 nugget ice maker: quick sheet

GE Profile Opal 2.0 countertop nugget ice makers, e.g. XPIO13SCSS and XPIO43SCSS (with side tank), plus Opal 2.0 Ultra; SmartHQ Wi-Fi (GE support pages; retailer listings). Daily output listed 24-38 lb depending on model and source.

6 components4 common failuresGE Profile
Manual · Ice Maker

Scotsman Brilliance SCN60 nugget and CU50 gourmet cube undercounter: quick sheet

Scotsman residential 15-inch undercounter ice machines: SCN60 Brilliance nugget (SCN60GA gravity drain, SCN60PA with pump; -1SU panel-ready, -1SS stainless) and CU50 gourmet cube (CU50GA gravity, CU50PA pump) (Scotsman spec sheets; KaTom, BBQGuys listings).

7 components4 common failuresScotsman
Undercounter clear-ice machine: field service manual · OnCall Tech