A commercial ice machine not making ice is in one of four states, and you can tell which by standing in front of it for five minutes. It is silent and idle. It is running with water flowing and nothing freezing. It is freezing ice and not releasing it. Or it is making ice, only far less than it should. Each state has its own short list of causes.
This guide is written for the person who has to get the machine going again: a restaurant or cafe manager, a bar supervisor, a facilities technician. It starts with what to check without tools, explains how to read what the machine is doing, and then takes each state in turn. It covers cube machines in detail, with a section on flake and nugget machines, and notes on the brands most common in Dubai. For a repair, see commercial ice machine repair in Dubai.
StateWhat you seeMost likely causesCan staff fix it?
IdleLights or display on, no compressor, no water flowSwitched to off or clean, bin full signal, a tripped safety, a programmed off periodOften
DeadNothing litNo power: breaker, isolator, plug, fuse on the boardCheck the supply
Not fillingTries to start, no water in the trough or sumpWater off, filter blocked, inlet valve, float or level sensorTap and filter, yes
Running, not freezingCompressor on, water running over the plate, no ice formingDirty condenser, fan failed, hot room, low refrigerant, hot gas valve stuck open, compressor not pumpingCleaning, yes
Freezing, not releasingA slab or cubes on the plate that will not dropScale, ice too thick, hot gas valve not opening, sensor fault, low refrigerantDescaling, yes
Low productionMakes ice, bin never fillsDirty condenser or air filter, hot kitchen, warm water, scale, clogged water filter, leaking valvesMostly yes
Stops with a code or beepsDisplay code, flashing light or counted beepsA safety has tripped: long freeze, long harvest, high temperature, waterNote it. Reset once
Staff can deal with roughly the top half of the causes: mode, water, air and scale. The refrigeration faults need a technician with gauges.
Before anyone resets anything, collect the evidence. A reset clears the fault signal, and the signal is the best clue you have.
1
Read the display or lightsWrite down any code, the number of beeps between pauses, or which lights are on or flashing.
2
Check the mode switch or settingIs it on ICE? Machines are routinely left on CLEAN, WASH or OFF after a cleaning shift.
3
Look at the binIs ice piled against the bin sensor, the curtain or the thermostat tube? Is the bin door shut?
4
Check the waterIs the supply tap open? Is there water in the trough or sump? What does the filter gauge read?
5
Check the airIs the air filter or condenser matted with dust or grease? Is anything stacked against the vents? How hot is the room?
6
ListenCompressor running? Fan running? Water pump running? Or silence?
7
Then reset onceSwitch off for three minutes and on again, and watch a full cycle.
If the machine stops again with the same signal, leave it off and call. Each restart into the same fault runs the compressor through a long, hot cycle, and that is how a sensor fault becomes a compressor fault.
While it is down, keep the bin door closed to hold what ice you have, and buy in food-grade bagged ice if you need to. Do not tip bags that have been on the floor into the bin.
Every batch cuber runs the same loop. If you know the loop, you can see which step has failed.
1
FillA valve lets water into a trough or sump until a float or probe says it is full.
2
FreezeThe compressor chills a metal evaporator plate. A pump circulates water over it. Ice builds up layer by layer for 10 to 30 minutes.
3
DecideA thickness probe, a float, a temperature sensor or a timer judges that the ice is ready.
4
HarvestA valve sends hot refrigerant gas into the plate, and on some machines water runs behind it, to loosen the ice. It slides off in one to three minutes.
5
ConfirmA curtain switch, a sensor or a timer confirms the ice has gone.
6
Purge and repeatThe mineral-heavy water left over is flushed to drain and the cycle starts again.
7
Stop when fullA bin control stops the machine when ice reaches it.
Step that failsState you see
FillNo water, machine waits or shows a water fault
FreezeWater flows, no ice, long freeze fault
DecideIce far too thick, or harvest far too early with thin ice
HarvestIce stays on the plate, long harvest fault
ConfirmIce has dropped, machine stays in harvest or stops
Bin controlIdle with an empty bin, or overfilling
Watch one full cycle with the front panel off, if the design allows it safely, or through the bin door. Time the freeze and the harvest with a phone. Those two numbers are the first thing a technician will ask for.
A machine that is powered and doing nothing is waiting for permission. Something is telling it not to run.
CheckDetailFix
ModeSwitch or menu on OFF, CLEAN or WASHSet to ICE
Bin full signalIce against the bin thermostat's tube, the curtain held open, a bin probe iced or scaled, a magnetic switch or its magnet missingClear the ice. Reseat the curtain. Clean the probe
Scheduled off timeMany electronic machines can be programmed to stop overnight or for set hoursCheck the clock and the programme
Cleaning reminder lockoutSome machines stop after a set number of hours until cleaned or acknowledgedFollow the display
Tripped safetyA high pressure, high temperature or long-cycle safety has locked the machine out. A light, a code or beepsNote it. Reset once. Find the cause
WaterNo water sensed in the trough, so the machine will not start the compressorSee state 2
Delay timerAfter a power cut or a reset, many machines wait some minutes before startingWait five to ten minutes
Door or panel switchA panel left off or a bin door open on machines that sense itClose it
Low ambient lockoutRoom too cold, on machines in a cold storeRelocate or wait
Check the breaker and the isolator switch on the wall.
Check the plug and socket on plug-in machines.
If other equipment on the same circuit is off, the fault is in the supply.
If the supply is good and nothing lights, the machine's own fuse, transformer or control board has failed. That is a technician's job.
A machine that went dead after a deep clean has often had water in its electrics. Leave it off to dry.
No water means no ice, and most electronic machines will not even start the compressor until they see water in the trough.
SymptomCauseFix
Trough or sump dry, supply tap closedClosed for cleaning or plumbing workOpen it
Filter gauge in the red, or flow weak after the filterCartridge cloggedChange the cartridge
Water reaches the machine, none entersInlet valve failed, or its strainer blockedTechnician
Water enters, machine does not recognise itLevel probe or float scaled, stuck or disconnectedClean. Check it was refitted after cleaning
Fills, then the level drops during freezeDump or drain valve leaking, or the trough cracked or out of placeListen for water at the drain during freeze. Technician
Fills continuously, overflows to drainInlet valve not closing, or the float or probe not sensingTechnician
Water in the trough, none flowing over the plateWater pump failed, or the distributor tube blocked with scaleClean the distributor. Pump: technician
Dry strips down the plateDistributor holes blockedRemove and clean it
After any building water shutdown, sediment arrives with the first water. If the machine stopped the day the water came back, change the filter and check the inlet strainer first. On machines that use incoming water to help release the ice, a restricted filter shows up as a harvest fault, not a fill fault.
If the compressor is running and water is circulating over a plate that never frosts, the machine cannot remove heat. Start with the things that stop it shedding heat, because they are the commonest and the cheapest.
CheckWhat you findMeaningFix
Air filter and condenserGrey with dust, or sticky with greaseHeat cannot leave the refrigerantWash the filter. Brush and vacuum the condenser. Degrease if greasy
Condenser fanNot turning with the compressor runningFan motor or its control failedTechnician
Air pathMachine boxed in, vents against a wall, stock piled round itHot air recirculatingClear the space the manual asks for
Room temperatureWell above 30 degrees CHotter than the conditions the output was rated at, and possibly beyond the machine's stated limitVentilate or cool the room. Relocate. Consider a remote condenser
Water-cooled machinesNo water flow through the condenser, or the outlet water barely warmCooling water off, regulating valve failed or condenser scaledRestore water. Technician
Remote condenser on the roofCoil packed with sand and dust, fan stoppedAs for a built-in condenserWash the coil. Technician for the fan
Plate slightly cool, never cold. Hissing all the timeHot gas valve stuck open or leaking throughHot gas is warming the plate during freezeTechnician
Plate frosts in one corner or along one edge onlyLow refrigerant charge, or a blocked metering deviceNot enough refrigerant reaching the plateTechnician: leak test
Compressor hums and clicks off repeatedlyStart components or the compressor itselfIt is not actually runningTechnician
Compressor runs quietly, both pipes at room temperatureCompressor not pumping, or the charge is goneTechnician
Clean the air side and retest before calling for a refrigeration fault. A choked condenser gives every symptom of a low gas charge, and is far more common.
If the plate grows a slab of ice and the machine then sits in harvest until it times out, the ice is stuck. This is the single most common way a commercial cuber stops, and scale is behind most of it.
CauseSignsFix
Scale on the evaporatorPlate looks dull, chalky or rough. Ice comes away in pieces or not at all. It has been more than six months since a descaleDescale with the maker's cleaner. Nickel-plated plates need a nickel-safe cleaner
Ice too thick, bridged across the plateA heavy slab locked between the dividersThickness probe out of position, dirty or disconnected, or a float stuck. Clean and reset
Hot gas valve not openingPlate stays cold through harvest. No hissTechnician
Low refrigerantFreeze was slow as well. Harvest weakTechnician
Harvest assist not workingOn machines with a pusher, an air pump or a water rinse behind the plateCheck water flow in harvest. Technician
Low water flow in harvestOn machines that run water behind the plate to release the ice: filter clogged or inlet valve weakChange the filter. Technician for the valve
Cold room or cold waterMachine in a chilled store, or winter nights on a remote systemRelocate. Head pressure control on remote systems: technician
Machine not levelSlab hangs up on one sideLevel it
Plating damagedFlaking, peeling or dark patches on the plateThe evaporator is failing. Technician
Switch the machine off and let it melt, or pour lukewarm water over it. Never lever or chip it off. The plate's surface is thin, the refrigerant tubes are directly behind it, and a scratch becomes the place where scale grips for the rest of the machine's life.
If the ice has clearly fallen and the machine does not move on, the sensor that confirms the drop is at fault: a curtain that did not swing back, a curtain switch, a thermistor out of position or a bin probe. Reseat the curtain first.
Low production is a more common complaint than none at all, and most of its causes are conditions round the machine and not broken parts.
CauseHow to tellFix
Dirty air filter or condenserLong freeze times. Hot air from the vents is weakClean. Put the filter on a monthly rota
Hot kitchenKeeps up overnight, falls behind at serviceVentilation or relocation
Warm supply waterWorse in summerShade and insulate supply pipework where possible. Allow for it
ScaleIce clings, harvest drags, cubes misshapen or cloudyDescale
Clogged water filterThin cubes, dry rows on the plate, gauge lowNew cartridge
Leaking water inlet or dump valveWater runs to drain during freeze. Long freeze with everything cleanTechnician
Leaking hot gas valveLong freeze, plate never quite cold enoughTechnician
Low refrigerantUneven ice across the plateTechnician
Bin control stopping earlyMachine idle with the bin half fullReposition the thermostat tube or probe. Clear ice from the sensor
Ice melting in the binBin door left open, drain blocked so ice sits in water, bin in a hot spotDoor, drain, location
Machine too smallBin empty at the same hours every day, cycles normalLarger bin, second machine or a bigger head
A machine's rated output is measured in a mild room with cool inlet water. Both figures are published on its specification sheet, usually with a table showing how output falls as air and water get warmer. In a hot kitchen with warm supply water, expect a clear shortfall against the headline figure. That is physics and not a fault. What you can control is the cleanliness of the condenser, the space round the machine and the temperature of the room.
To check, time a freeze and a harvest and weigh one batch. Multiply up to 24 hours and compare with the maker's table for your room and water temperatures. If you are close to the table, the machine is healthy.
A machine that worked before a clean and not after has nearly always been put back together or switched wrongly. Check these before calling.
Mode switch or setting back on ICE, not CLEAN or WASH.
Any service or drain switch back in its normal position.
Water curtain hanging on both pins, the right way round, with its magnet in place.
Ice thickness probe clipped in, plugged in and not touching the plate.
Water level probe or float in its holder, the right way up and plugged in.
Distributor tube seated, holes facing the plate.
Trough or sump clipped in. Drain plug or standpipe refitted.
Pump hose and any spray tubes pushed home.
Splash guards and panels back on.
Cleaner left in the system can also stop ice forming for a cycle or two, and probes that are still wet with cleaner can misread on the first cycle. Let it run. Discard the first batches.
Codes, beeps and lights
Modern machines stop themselves and report why. The reports fall into a few kinds, whatever the brand.
Kind of signalWhat it means in generalFirst checks
Long freezeThe freeze cycle ran to its time limitCondenser and air filter, water flow, valves leaking, sensor that ends the freeze
Long harvestHarvest ran to its time limitScale, water flow on machines that use it for harvest, hot gas valve, the sensor that ends harvest
High temperature or high pressureThe machine cannot shed heatCondenser, fan, room temperature, cooling water
Water faultNo water, or the level not sensedTap, filter, inlet valve, probe or float
Bin or curtain faultThe full-bin sensor is reading wronglyCurtain, magnet, probe, thermostat tube
Sensor faultA named probe or thermistor is out of rangeIts connector and position
Voltage faultSupply too low or too highThe building's electrical supply
Clean or service reminderA timerClean and reset
Hoshizaki boards beep a number of times, Manitowoc Indigo machines show an E code and keep an event log, and Scotsman Prodigy machines show a code with coloured lights. The meanings are specific to each make and often to the board, so read them from the label inside the machine or its manual. Our pages for Hoshizaki, Manitowoc and Scotsman explain each system.
Flake and nugget machines
Flake and nugget machines work differently. Water enters the bottom of an upright refrigerated cylinder, ice forms on its wall, and a slowly turning auger scrapes it off and pushes it up and out. There is no harvest cycle.
SymptomCauseAction
No ice, auger not turningGear motor failed or tripped, or the bin control is satisfiedCheck the bin. Technician
Auger turns, no iceNo water in the reservoir, or no refrigerationCheck the float valve and supply. Technician
Squealing, groaning or grindingAuger bearings failingSwitch off. Do not run it
Stops, gear motor very hotScale in the cylinder making the auger bind, or ice packed in the chuteClear the chute. Descale. Technician
Wet, soft iceScale, worn extruder or breaker, low refrigerantDescale. Technician
Water dripping from under the cylinderWater seal failedTechnician, before it ruins the lower bearing
Low outputDirty condenser, scale, low water levelClean and descale
The one rule that matters: a flaker that has started to squeal or grind should be switched off. Bearings and a seal are a routine repair. An auger that has been allowed to wander and score the cylinder is not.
What staff can maintain, and what they should leave
TaskStaffTechnician
Wash the air filterYes, monthly or more in a greasy kitchen
Brush and vacuum the condenser faceYes, with the machine offDeep clean and degrease
Change water filter cartridgesYes
Run the clean and sanitise cyclesYes, following the manual exactlyStrip-down clean of the water system
Clean and sanitise the bin, scoop and doorYes
Reseat the curtain, clear ice from the bin sensorYes
Reset once after a faultYes
Adjust ice thicknessOnly if the manual shows how and staff are trainedYes
Anything inside the electrical boxNoYes
Anything on the refrigeration circuitNoYes
Bearings, seals, gear motorsNoYes
Makers generally ask for a full descale and sanitise at least every six months, and more often where there is yeast, flour or grease in the air. A written rota, with a name against each task, is what keeps it happening.
Make and model, from the data plate.
The code, the beeps or the lights, exactly as seen before any reset.
Which of the states it is in. idle, no water, running without freezing, freezing without releasing, or low output.
Freeze time and harvest time, if you timed them.
Room temperature, and whether the machine is boxed in.
When the water filter was last changed and when the machine was last descaled.
Whether anything changed recently. a clean, plumbing or electrical work, a water outage, the machine being moved.
That information usually lets the right valve, sensor, pump or board be on the van. Our diagnostic visit is AED 100 plus VAT, with a fixed price before any work, and we respond within the hour to an emergency in a working kitchen. See commercial ice machine repair in Dubai.
Do not keep resetting a machine that stops with the same fault.
Do not chip or lever ice off the evaporator.
Do not use household descalers, vinegar or bleach in place of the products the manual specifies.
Do not mix cleaner and sanitiser.
Do not run the machine with its air filter removed.
Do not bridge or tape a bin switch or curtain switch to keep it running.
Do not run a flake machine that is making a new noise.
Do not top up the bin with ice that has been handled or stored on the floor.
Why is my commercial ice machine not making ice?
+
It is idle because of its mode or a full-bin signal, has no water, cannot freeze because it cannot shed heat or has lost refrigerant, or is freezing ice that will not release because of scale or a harvest fault.
Why is my ice machine running but not making ice?
+
Usually a dirty condenser or air filter, a failed fan or a hot room. After that, a stuck hot gas valve, low refrigerant or a compressor that is not pumping.
Why is ice stuck on the plate?
+
Scale on the evaporator in most cases. Otherwise ice that has grown too thick, or a hot gas valve that is not opening.
Why did it stop working after cleaning?
+
It was left in clean mode, the water is still off, or a curtain, probe, float or distributor was refitted wrongly.
How do I reset a commercial ice machine?
+
Switch it off for a few minutes and on again, or use the reset on the control board. Note any code first, and reset only once.
Why is my ice machine making less ice in summer?
+
Hotter air and warmer supply water reduce output on every air-cooled machine. A dirty condenser makes it much worse.
How long should a freeze cycle take?
+
Typically 10 to 30 minutes, depending on the model and the air and water temperatures. The maker's table gives the figure for yours.
How often should a commercial ice machine be cleaned?
+
At least every six months, and every two to three months in bakeries, pizzerias and bars.
Can I descale it myself?
+
Yes, if you follow the manual and use the cleaner it specifies. Plated evaporators need a nickel-safe product.
The compressor is running and both pipes are warm. What does that mean?
+
The machine has lost its refrigerant or the compressor is not pumping. It needs a technician.
Is it worth repairing?
+
Water-side and sensor faults always are. Refrigeration repairs depend on the age of the machine and the state of its evaporator.
Who repairs commercial ice machines in Dubai?
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One Click Dubai responds the same day, and within the hour in an emergency. Call or WhatsApp +971 55 209 9785.
Reset once and stopped again?A technician can find the cause on site. The diagnostic is AED 100 plus VAT, and repairs carry a 1-month warranty.
