ICE · Kent
Ice machine making small, hollow or cloudy ice
Undersized, hollow or cloudy ice cubes are one of the most common faults reported on commercial ice machines across Kent kitchens and bars. The cause is usually water flow, scale, or refrigerant charge rather than the machine itself failing outright. This guide explains what is happening inside the machine and what to check before booking an engineer.
Quick answer
Small, hollow, or cloudy ice almost always points to a problem with water quantity, water quality, or the freeze cycle timing rather than a total breakdown. On Hoshizaki, Scotsman, Maidaid and Brema machines the pattern is similar: not enough water reaching the evaporator plate, mineral scale interfering with clear ice formation, or a refrigerant fault causing the freeze cycle to run too long or too short.
- Cloudy or white ice usually means dissolved minerals or air trapped in the water, often linked to scale build up or a worn water filter.
- Small or thin cubes suggest low water flow to the evaporator, a partially blocked water distribution tube, or a weak water pump.
- Hollow or misshapen cubes point to an inconsistent freeze cycle, low refrigerant charge, or a faulty harvest cycle timer or thermostat.
- A combination of all three symptoms together often means scale has built up enough to restrict both water flow and heat transfer at the evaporator.
None of these faults are usually dangerous, but they do affect ice output, drink quality, and food safety compliance, so they are worth addressing promptly.
What to do before calling an engineer
A few checks on site can narrow down the cause and save an unnecessary call out charge.
- Check the water supply line is fully open and not kinked, and confirm mains pressure has not dropped elsewhere in the building.
- Inspect the water filter if one is fitted. A clogged filter cartridge is one of the most frequent causes of cloudy, small ice and should be changed on the manufacturer's recommended schedule.
- Look inside the ice making compartment for visible scale on the evaporator plate or grid. White, chalky deposits reduce heat transfer and directly cause cloudy or undersized cubes.
- Check the water level in the reservoir during a cycle. If it is noticeably low, the float valve or water inlet solenoid may be at fault.
- Note how long each freeze cycle takes. A cycle that runs noticeably longer or shorter than normal for that model suggests a refrigerant or control fault rather than a water problem.
- Check the last descale date. If it has been longer than the manufacturer's interval, scale is the most likely cause and a professional descale should be the first step.
⚠️When to call an engineer straight away
Some symptoms alongside cloudy or hollow ice indicate a fault that should not wait for a scheduled service.
- Ice that smells or tastes unusual, which can indicate stagnant water, a failing water filter, or contamination in the supply line.
- Visible mould, slime or black residue anywhere inside the ice storage bin or on the curtain.
- A refrigerant hissing sound, oily residue around pipework, or a sharp drop in ice production alongside cloudy cubes.
- Water pooling under or around the unit, which can point to a drainage fault or a cracked evaporator.
- Any ice machine used for food or drink service that has not been cleaned or sanitised within the schedule required by your HACCP food safety plan.
If any of these apply, stop using the machine for consumption and arrange an inspection. Contaminated ice is a direct food safety risk and falls under the same due diligence obligations as other food contact equipment, as outlined by the Health and Safety Executive.
Get the fault diagnosed properly
Our engineers work on Hoshizaki, Scotsman, Maidaid, Brema and Foster ice machines across Kent, carrying descale kits, water filters and diagnostic tools for same day call outs. Advantage Catering Equipment is triple ISO certified (ISO 9001, 14001, 45001) so every visit is documented and traceable.
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Find out more →Frequently asked questions
Why is my ice machine making small ice cubes all of a sudden?
This usually means reduced water flow to the evaporator, often caused by a blocked filter, partially closed supply valve, or a weak water pump. Scale build up on the water distribution tube can also restrict flow gradually over time.
Is cloudy ice safe to use?
Cloudy ice caused by dissolved minerals is not usually a food safety hazard on its own, but it often signals scale build up that will worsen and can allow bacteria to establish in the water system over time. It is worth investigating rather than ignoring.
How often should a commercial ice machine be descaled?
Most manufacturers recommend descaling every three to six months, though hard water areas in Kent may need more frequent treatment. Check your machine's handbook and your water hardness report.
Can hollow ice mean the refrigerant is low?
Yes, hollow or misshapen cubes can indicate an inconsistent freeze cycle caused by low refrigerant charge or a faulty control component. This should be checked by an F-Gas qualified engineer rather than topped up without diagnosis.
Does water quality affect ice clarity?
Yes, mains water with high mineral content or a failing filter is one of the most common causes of cloudy ice. Fitting or replacing the correct filter cartridge often resolves the issue, in line with guidance from the Water Regulations Advisory Scheme.
Sort the ice quality issue before it affects service
Small, hollow or cloudy ice rarely fixes itself and often points to scale, water flow, or refrigerant faults that get worse with time. Our engineers can diagnose and resolve the cause on site.
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