Why is my commercial ice machine not making ice?

Usually it is off, the bin is full or the curtain is stuck, the water is off or the filter is clogged, the room is too hot, the condenser is dirty, or a safety limit stopped it. Check those six things first. If it still makes no ice, or the same code comes back after one reset, call a technician.

Why is my ice machine making thin cubes?

Thin cubes usually mean too little water or scale on the plate. Check the filter cartridge, the supply valve and the water pressure, then clean the machine if it is due.

Why is my ice machine making cloudy or soft ice?

Poor incoming water, poor filtering, a dirty machine or a dirty inlet screen. Manitowoc's manuals list those causes, and suggest a water test if cleaning and a new filter do not fix it.

Is it safe to reset an ice machine?

Once, yes. Write the code down first. If it comes back, stop resetting and call a technician: the machine is telling you a limit keeps being hit.

What should I tell the ice machine technician?

The model and serial number, the code or beeps, what you see, when it was last cleaned, when the filter was changed, and the room temperature. It saves a trip.

Commercial ice machine repair: what fails, and what to check before you call

By Vimal Bhaya, Founder and Lead Systems Architect · Last reviewed 5 November 2026

This is a continuation of Commercial ice machine maintenance, a 5-part tutorial. You are on part 4 of 5.

Before you call for repair, check six things: the power, the bin, the water supply and filter, the room temperature, the condenser, and any code on the display. Those cover what an owner can safely fix.

A machine that still makes no ice, or shows the same code again after one reset, needs a technician. Tell them the model, the code and what you saw.

Six checks cover what an owner can safely fix

A chart of owner checks for an ice machine that makes no ice, from top to bottom. One: is it switched on, and not in a clean cycle? Two: is the bin full, or is ice stuck in the curtain or against the bin control? Three: is the water on, with the filter not overdue? Four: is the room inside the machine's range? Five: is the condenser clean and its air path clear? Six: is a code or light showing? Write it down. If every check passes, or a code keeps coming back, call a technician.

Power and the switch

Check: the machine is switched on and plugged in, and not left in a clean cycle.
Should be: on, with no clean light lit.
What to do next: if it was off, switch it on and wait for a batch. If it trips the breaker, leave it off and call. Never keep resetting a machine that trips.

The bin and the curtain

Check: the bin is not full, the water curtain swings freely, and no ice is stuck against the bin control.
Should be: room in the bin, and a curtain that hangs closed.
What to do next: clear stuck ice by hand. Never chip ice off with a tool. If the bin is empty and the machine still says full, the bin control needs a technician.

The water and the filter

Check: the supply valve to the machine is open, the line is not kinked, and the filter cartridge is inside its date.
Should be: valve open, cartridge within its date or gallons.
What to do next: open the valve or replace an overdue cartridge, then wait for a batch.

The room temperature

Check: the air around the machine is inside its range, on the nameplate or in the manual.
Should be: for example 35°F to 110°F (1.6°C to 43.4°C) on Manitowoc's S320 and S420, 45°F to 100°F (7°C to 38°C) on Hoshizaki KM cubers, 50°F to 100°F (10°C to 38°C) on Scotsman Prodigy.
What to do next: if the room is hotter, move heat sources away and give the machine air. If it cannot be fixed, the machine is in the wrong place.

The condenser on an air-cooled machine

Check: the condenser fins are clean and nothing is stacked against the vents.
Should be: fins you can see light through, and the clearance the manual gives. One Manitowoc model asks for 5 inches (13 cm) at the top and sides and 8 inches (20 cm) at the back.
What to do next: switch off before cleaning near the fan. Vacuum or brush the fins gently, as Follett's manual describes, then switch back on.

A code, a light or beeps

Check: what the display, the lights or the beeps say.
Should be: no code. A code means the control stopped the machine on purpose.
What to do next: write the code down with the time. Look it up on the maker's page below, then call if it comes back after one reset.

What you see usually points to the cause

Ice machine symptoms, in what you see first.
What you see	What it usually means	Where to look
No ice at all	Off or in a clean cycle, the bin full or the curtain stuck, the water off, the room out of range, or a safety stop	The six checks
Slow batches, less ice	A dirty condenser, scale on the plate, a hot room or warm water coming in	The condenser, a clean
Thin, small or shallow cubes	Too little water: a clogged filter, a dirty inlet screen or low pressure; or scale on the plate	The water, the filter
Cubes thin or missing on one side of the slab	Scale in the distribution tube's holes, so the water runs unevenly over the plate	A clean, with the tube taken out and descaled
Soft or cloudy ice	Poor incoming water, poor filtering, a dirty machine, a dirty inlet screen	Water filters
A code, lights or beeps	A safety limit stopped the machine: a long freeze, a long harvest, a water problem	The codes

Manitowoc's manuals give that list for soft or cloudy ice. Warm incoming water slows the freeze too: Hoshizaki's KM cubers want water between 45°F and 90°F (7°C to 32°C).

A cube machine has two cycles, and most faults stretch one of them

The machine freezes water on a cold plate, then warms the plate to drop the ice. A dirty condenser or scale makes the freeze longer. A part that stops the plate warming or the slab falling makes the harvest longer. The control times both, and stops the machine when one runs too long too often.

An animated drawing of a cube ice machine making ice, seen from the front. In the freeze, a pump lifts water from the trough at the back to the distribution tube at the top, and the water runs down the cold evaporator plate behind the water curtain and freezes in layers, so the cubes grow thicker. Water that does not freeze runs back to the trough. In the harvest, the plate warms for a short time, the slab lets go, pushes the curtain open and falls into the bin as cubes, and the pile in the bin grows. After three harvests the pile reaches the bin control, and the machine stops until ice is taken out.

A labeled front view of a cube ice machine with its cover off, sitting on its bin. Numbered: 1 the water inlet valve, 2 the water trough, 3 the water pump, 4 the distribution tube, 5 the evaporator, the cold plate the ice forms on, 6 the water curtain, 7 the bin control, 8 the condenser and its fan, 9 the drain, and 10 the water filter on the supply line outside the machine.

A code names the limit the machine hit

Scotsman Prodigy: code 1 is a long freeze, code 2 a long harvest. Flashing means it is retrying; steady means it has shut down. The Scotsman page has the letters too.
Hoshizaki KM: one beep is a high evaporator temperature, two a long harvest, three a long freeze. The Hoshizaki page has the causes.
Manitowoc: safety limit 1 is a long freeze and safety limit 2 a long harvest. The Manitowoc page has the limits.
Ice-O-Matic Elevation: code 7 is a water problem. The Ice-O-Matic page has the reset.

Reset once. If the code comes back, stop and call. A machine that keeps hitting a limit has a fault the reset does not fix.

What to tell the technician

The model and serial number, from the nameplate.
The code, lights or beeps, and when they started.
What you see: no ice, slow ice, thin or cloudy cubes.
When it was last cleaned and when the filter was last changed.
The room temperature near the machine.

Owners never touch the refrigerant, the wiring or the control board. Those are a technician's work.

SiteWise keeps the ice machine's PM on schedule and the history in one place

When a machine stops, the fix goes faster if the technician sees the code, a photo and the last clean before they arrive.

And this is one machine. It also needs a clean, a sanitize, the bin, the filter and the condenser, each on its own interval. A kitchen or a site often has 10 to 15 machines like it, each with a list of its own. A paper checklist on the wall cannot keep that many dates, and it cannot tell anyone when one is missed.

SiteWise keeps all of it on your phone, in a free app. Yes, really free: the free plan has unlimited work orders (100 open at a time), 20 locations and 250 assets, far more than 15 machines.

Download the app free

Or open renergytech.com/download/sitewise on your phone.

SiteWise is a CMMS (a computerized maintenance management system): software that holds the assets, schedules the PMs, issues the work orders and keeps the history.

The PM. Set the clean every 6 months, or the interval your manual gives. SiteWise creates the work order a set number of days before it is due, or schedules the next one from when the last was done.
The procedure. Attach the maker's steps, with photos, to the PM, so whoever does the clean uses the right cleaner at the right amount.
The parts. Keep cleaner, sanitizer and filter cartridges as parts with a minimum per storeroom. SiteWise reserves the parts for a planned PM 30 days ahead.
On the phone. Technicians create, update and close work orders and PMs offline, on every plan, add photos and videos up to 30 seconds, and scan the machine's QR code to open its history.

Open a work order from the phone with a photo or a 30-second video, set its priority, assign it, and close it when the machine is back, with the history kept on the asset.

Download the PM schedule above as a spreadsheet: ice machine PM schedule (CSV). The plans are on the SiteWise page.

Commercial ice machine repair: what fails, and what to check before you call