Hoshizaki AM-50BAJ / AM-50BAK top-hat undercounter cuber: quick sheet

Covers: Hoshizaki AM-50BAJ / AM-50BAK (and -AD ADA, -DS stainless variants) self-contained air-cooled undercounter cubers, light commercial and upscale residential. Refrigerant and electrical listings differ between versions: read the data plate before ordering parts.

Single sourceBrands: Hoshizaki7 components

A small spray-type 'top hat' cuber that makes about 50 lb/day of 'top hat' style cubes into a built-in bin. It needs a cold water supply, a gravity drain to a floor drain with an air gap (or the optional HS-5061 pump), and regular Scale Away cleaning. Hoshizaki service manuals are written for qualified technicians.

Safety first

Unplug and shut off water before service.
Sealed-system work is blocked; R-290 units need hydrocarbon-trained, EPA 608 certified technicians.
No ammonia-based cleaners.

How it works

Water from a tank is sprayed up into inverted cups on a refrigerated evaporator, building cubes from the outside in. When the cycle ends, harvest frees the cubes and they fall to the bin; the tank refills for the next cycle.

Output depends strongly on ambient air and incoming water temperature, which explains why listings quote 51 lb or 54 lb per day. A bin control stops production when the bin is full.

A clean, open condenser and scale-free water system are the two biggest factors in production. The unit must not run in freezing conditions; below 32 F it should be drained and prepared for non-use.

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

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