Commercial Fridge Freezing Up? Common Causes and What to Check
Is your commercial fridge freezing up inside the cabinet? Ice build-up, frozen shelves, blocked vents and frost around the door can be frustrating for any café, restaurant, supermarket, takeaway shop or food retail business. A commercial fridge is designed to keep products cold, but it should not be turning the inside of the cabinet into a block of ice.
If you are dealing with a commercial fridge freezing up, it is important to check the simple causes first before assuming the unit needs replacement. Many freezing issues come from blocked airflow, damaged seals, poor placement or incorrect loading.
When a commercial fridge freezing up problem starts, many business owners immediately think the fridge is faulty. Sometimes there may be a technical issue, but in many cases the cause is related to airflow, door seals, placement, loading habits or maintenance. If the problem is ignored, the fridge may struggle to cool properly, use more energy and place extra strain on the system.
At Freeze Edge, we supply commercial refrigeration equipment for Australian businesses, including commercial fridges, commercial freezers, open display fridges, glass door display fridges, drinks fridges, bar fridges and deli display fridges. This guide explains why a commercial fridge may freeze up, what signs to look for and when to call a technician.
Contents
Why Is My Commercial Fridge Freezing Up?
A commercial fridge freezing up usually means the refrigeration system or airflow inside the cabinet is not working as it should. Cold air needs to move around the fridge properly. If airflow is blocked, warm air enters the cabinet, or the fridge is running too hard, ice can begin to form in the wrong areas.
The most common causes include:
- Air leaks around the door
- Damaged or dirty door gaskets
- Poor airflow inside the fridge
- Overloading shelves
- Blocked vents
- Incorrect temperature settings
- Placing the fridge near heat sources
- Dirty condenser coils
- Faulty defrost system or thermostat
Some of these issues can be checked by staff as part of regular maintenance. Others need a qualified refrigeration technician.
Cause 1: Air Leaks Can Cause a Commercial Fridge Freezing Up
Air leaks are one of the most common reasons for ice and frost problems. When warm air enters the fridge, moisture can also enter. Once that moisture meets the cold air inside the cabinet, it can turn into condensation, frost or ice.
If the door is not closing properly, the fridge may keep trying to maintain temperature. This can make the system run longer and may create ice build-up inside the cabinet.
Common signs of air leaks include:
- Frost near the door area
- Condensation around the door frame
- Cold air escaping when the door is closed
- The door not sealing evenly
- The compressor running for longer than usual
If your commercial fridge freezing up issue is mainly near the door, start by checking whether the door closes properly and whether the seal is clean and in good condition.
Cause 2: Damaged or Dirty Door Gasket
The door gasket, also called the door seal, is the rubber strip around the fridge door. Its job is to create a tight seal when the door closes. If the gasket is dirty, cracked, loose or damaged, cold air can escape and warm air can enter.
A damaged gasket can cause the fridge to work harder, run longer and develop frost or ice around the cabinet. This is especially common in busy commercial environments where doors are opened frequently throughout the day.
Check the gasket for:
- Cracks or splits
- Loose sections
- Mould, grease or food residue
- Warping or gaps
- Areas where the seal does not touch the cabinet properly
You can do a simple paper test. Place a piece of paper between the door and the frame, then close the door. If the paper slides out very easily, the seal may not be gripping properly.
We have a full guide on this topic here: commercial fridge door seal maintenance.
Cause 3: Poor Airflow Inside the Fridge
Poor airflow is another major reason for a commercial fridge freezing up. Commercial fridges need air to move around the cabinet so products stay at a consistent temperature. If airflow is blocked, some areas may become too cold while others may not cool properly.
When airflow is restricted, a commercial fridge freezing up problem can happen because cold air is not moving evenly through the cabinet.
This can happen when shelves are overloaded, products are pushed against vents or stock is packed too tightly. It can also happen if staff use the fridge as extra storage without leaving enough space for air movement.
To improve airflow:
- Do not overload shelves.
- Keep products away from internal vents.
- Leave space between stock items where possible.
- Do not block fan areas inside the cabinet.
- Organise products so air can circulate properly.
Good airflow helps the fridge maintain temperature more evenly and reduces the chance of ice forming in the wrong areas.
Cause 4: Incorrect Temperature Settings
If the temperature is set too low, the commercial fridge freezing up issue may become worse, especially for products placed close to vents or cold air outlets.
Sometimes ice build-up happens because the temperature is set too low. Business owners may lower the temperature setting because they think it will keep products safer or colder, but setting a fridge colder than needed can create problems.
A commercial fridge should be set according to the product requirements and the manufacturer’s guidance. Setting it too low may cause products to freeze, especially items placed near vents or cold air outlets.
If your fridge is freezing products, check the controller setting. If you are unsure what temperature is suitable, speak with your supplier or a qualified technician.
Cause 5: Poor Placement Near Heat Sources
It may sound strange, but placing a fridge near heat can contribute to freezing and performance problems. If the fridge is near ovens, fryers, grills, direct sunlight or hot kitchen equipment, the system may work harder to maintain the set temperature.
When the system runs harder for longer, cooling can become uneven. Combined with poor airflow or a damaged gasket, this can contribute to frost and ice build-up.
A commercial fridge should be placed in a suitable environment with good ventilation. If your shop or kitchen gets hot, you should also consider the ambient temperature rating of the fridge.
Read more here: commercial fridge ambient temperature guide.
Cause 6: Dirty Condenser Coils
A dirty condenser can also affect fridge performance. The condenser helps release heat from the refrigeration system. If dust, grease or debris blocks airflow through the condenser, the system may work harder than it should.
When the condenser is dirty, the fridge may struggle to operate efficiently. This can lead to longer compressor run time, higher energy use and inconsistent performance.
Regular condenser cleaning is one of the most important maintenance tasks for commercial refrigeration. If you have not checked the condenser recently, read our commercial fridge maintenance guide.
Cause 7: Faulty Defrost System or Thermostat
If basic cleaning, airflow and gasket checks do not fix the problem, the issue may be technical. Some commercial fridges have defrost systems that help manage frost and ice build-up. If the defrost system is not working properly, ice can build up inside the cabinet.
A faulty thermostat, sensor or controller may also cause temperature problems. If the fridge does not read temperature correctly, it may run too long or cool more than needed.
These problems should be checked by a qualified refrigeration technician. Do not attempt electrical or refrigeration repairs yourself.
What About Commercial Freezer Ice Build Up?
Commercial freezer ice build up is also common, but freezers are different from fridges because they are designed to operate below freezing. Some frost may occur depending on the model and usage, but heavy ice build-up, blocked vents or ice around the door can indicate a problem.
Common causes of commercial freezer ice build up include:
- Damaged freezer door seals
- Frequent door openings
- Warm, moist air entering the cabinet
- Overloading the freezer
- Blocked airflow
- Faulty defrost system
- Poor placement near heat sources
For commercial freezers, door seals and airflow are especially important. A weak seal can allow warm, moist air to enter, which quickly turns into frost or ice inside the cabinet.
If your business needs reliable frozen storage or display, browse our commercial freezers Sydney range for cafés, restaurants, supermarkets and food retailers.
Quick Checklist: What to Check First
If your commercial fridge freezing up problem has just started, use this simple checklist before calling a technician.
This quick checklist can help you identify whether the commercial fridge freezing up issue is caused by simple maintenance, airflow or placement problems.
- Check if the door is closing fully.
- Inspect the door gasket for dirt, cracks or gaps.
- Clean the gasket if it is dirty.
- Check whether stock is blocking internal vents.
- Reduce overloading on shelves.
- Check the temperature setting.
- Make sure the fridge is not near heat sources.
- Check that external ventilation areas are clear.
- Inspect the condenser for dust build-up.
If the ice continues to build up after these checks, it is time to contact a technician.
How to Prevent a Commercial Fridge Freezing Up
Prevention is better than waiting for the fridge to fail. Many ice build-up issues can be reduced with regular maintenance and correct use.
To help prevent your commercial fridge freezing up:
- Keep door seals clean and in good condition.
- Train staff to close fridge doors properly.
- Avoid leaving doors open during busy service.
- Do not overload shelves.
- Keep vents and fans clear.
- Clean the condenser regularly.
- Place the fridge away from ovens, fryers and direct sunlight.
- Check temperature settings regularly.
- Book professional servicing when needed.
These simple habits can help reduce energy use, improve cooling performance and extend the life of your equipment.
Why This Matters for Cafés, Restaurants and Food Retailers
For a food business, refrigeration problems can affect more than the equipment. A fridge freezing up can interrupt service, make products harder to access and affect product quality.
A café may rely on drinks fridges, under bench fridges and display fridges throughout the day. A restaurant may need consistent storage for ingredients. A supermarket or convenience store may depend on glass door fridges and open display fridges for customer-facing sales.
If a fridge freezes up or performs poorly, staff may lose time, products may be affected and customers may notice the issue. That is why maintenance and correct fridge use should be part of normal business operations.
Energy Efficiency and Running Costs
When a fridge is not operating properly, it may use more electricity than necessary. Air leaks, poor airflow, dirty condensers and incorrect placement can all make the system work harder.
For more information about refrigeration efficiency for Australian businesses, you can refer to the Australian Government’s business refrigeration guidance.
Keeping your fridge clean, well ventilated and properly sealed helps support better performance and may reduce unnecessary running costs.
When Should You Call a Technician?
Some basic checks can be done by staff, but not every problem should be handled in-house. Call a refrigeration technician if:
- The fridge keeps freezing up after cleaning and airflow checks.
- Ice is building up quickly or heavily.
- The temperature is inconsistent.
- The fridge is making unusual noises.
- The compressor seems to run constantly.
- The door seal is damaged and needs replacement.
- The defrost system may not be working.
- You are unsure what is causing the issue.
Fixing the issue early can help prevent bigger repair costs and reduce disruption to your business.
Browse Commercial Fridges and Freezers at Freeze Edge
Freeze Edge supplies commercial refrigeration equipment for cafés, restaurants, supermarkets, convenience stores, takeaway shops, butcher shops, bakeries and food retailers across Australia.
Whether you need a commercial fridge, commercial freezer, glass door display fridge, open display fridge, drinks fridge, bar fridge, deli display fridge or under bench fridge, our team can help you choose the right unit for your business.
Browse our commercial fridges, explore our commercial freezers Sydney, or read our commercial fridge buying mistakes guide before upgrading.
For product support and Australia-wide delivery options, call Freeze Edge on 1300 108 190 or visit us at 11 Homedale Rd, Bankstown NSW 2200.
Frequently Asked Questions
Why is my commercial fridge freezing up?
A commercial fridge freezing up can be caused by air leaks, damaged door gaskets, poor airflow, blocked vents, incorrect temperature settings, dirty condenser coils or a faulty defrost system.
Can a damaged door gasket cause ice build-up?
Yes. A damaged or dirty door gasket can let warm air enter the fridge. This moisture can turn into frost or ice inside the cabinet.
Can poor airflow make a fridge freeze up?
Yes. If shelves are overloaded or vents are blocked, cold air may not circulate properly. This can cause uneven cooling and ice build-up in some areas.
Should I turn the temperature lower if my fridge is not cooling properly?
Not always. If the problem is airflow, door seals, condenser dust or placement, lowering the temperature may not fix the issue and could make freezing worse.
Why does my commercial freezer have heavy ice build-up?
Heavy commercial freezer ice build up can be caused by damaged door seals, frequent door openings, warm air entering the cabinet, blocked airflow or a faulty defrost system.
When should I call a refrigeration technician?
Call a technician if the fridge keeps freezing up after basic cleaning, airflow and gasket checks, or if you suspect a faulty thermostat, sensor or defrost system.