What is predictive maintenance for refrigeration?
Maintenance on a refrigeration system is everything you do to keep it from breaking down: cleaning, inspections, replacing worn parts and checking pressures and refrigerant. Most businesses rely on preventive maintenance, where a technician visits on fixed dates. Predictive or condition-based maintenance adds continuous measurement, and the service is planned when the readings show a need.
Maci Intelligence is predictive maintenance. Sensors on the system measure current, pressure and temperature every minute. The AI learns how each individual system normally behaves and reacts when that behaviour starts to change. You are told typically 3 to 6 weeks before a breakdown, with the likely cause. See how the AI spots a breakdown coming.
Reactive, preventive or predictive maintenance: what is the difference?
There are three ways to keep a refrigeration system running, and most sites use a mix. They differ in what triggers a visit and when a fault is found.
| Approach | What triggers the visit | Faults between visits | Typical visit |
|---|---|---|---|
| Reactive (repair after breakdown) | A warm cold room or a controller alarm | Found only once the system has stopped | Emergency call-out, often in the evening or at the weekend |
| Preventive (fixed interval) | The calendar, usually once or twice a year | Found at the next visit | Planned, even when the system runs well |
| Predictive and condition-based | Readings that drift from the system’s normal behaviour | Found while still small | Planned in working hours, with the right part |
Condition-based and predictive maintenance are often used to mean the same thing. Condition-based means acting when a reading shows wear or imbalance. Predictive goes one step further and estimates how long the system is likely to keep running before the fault stops it. That estimate is what lets you choose the day of the visit.
The approaches work together. Scheduled servicing and the mandatory leak checks still have to happen. Predictive maintenance makes them more targeted, because the technician knows which systems need attention. There is more on this in our article on preventive versus predictive maintenance.
How often should a refrigeration system be serviced?
Most commercial refrigeration systems are serviced once or twice a year. Systems that work hard, such as supermarket display cases, process cooling or plant in hot machine rooms, often need more visits. The manufacturer’s guidance and your refrigeration contractor’s experience with your systems should set the interval.
Leak checks are a legal requirement under the EU F-gas Regulation (EU) 2024/573. How often depends on the refrigerant charge, measured in tonnes of CO2 equivalent. Systems with 5 tonnes CO2e or more must be checked at least every 12 months, 50 tonnes or more at least every 6 months, and 500 tonnes or more at least every 3 months. A working leak detection system allows longer intervals. Every check goes in the system’s log, see F-gas and leak checks.
What should a refrigeration service contract include?
A refrigeration service contract sets out what the contractor does, how often, and what it costs when something goes wrong outside the agreement. A good contract usually covers:
- The number of planned visits a year, and which systems they cover
- Cleaning the condenser and evaporator, checking drains, heaters and door seals
- Checking pressures, superheat, electrical connections and contactors
- Mandatory leak checks and keeping the F-gas log
- Response times for breakdowns, and call-out rates for evenings, nights and weekends
- How spare parts are ordered and charged
- A service report after every visit
Predictive maintenance changes one important thing in the contract: visits can be prioritised by the condition of each system. The technician sees which systems are drifting and arrives prepared, with the right part. With Maci Service, each system’s service history sits in one place, so you and the technician can both see what has been done.
You do not need to change contractor to get predictive maintenance. Maci Intelligence fits your existing systems whatever the make, and your current technician can be on the list that receives warnings. Refrigeration companies can also become Maci partners.
Which faults show in current, pressure and temperature weeks ahead?
Most refrigeration faults build up over weeks. The compressor works a little harder, a pressure shifts, or the defrost starts to drag. Each change is small, but compared with the system’s own normal behaviour it becomes clear. The table shows the faults Maci Intelligence can usually see coming, and what changes in the readings.
| Fault | What changes in the readings | Visible in advance |
|---|---|---|
| Compressor wear | The compressor draws more current for the same cooling, runs longer or starts more often | Yes, often weeks ahead |
| Low refrigerant and leaks | Suction pressure falls slowly, superheat rises and the compressor runs longer | Yes, often weeks ahead |
| Evaporator icing and defrost faults | Defrosts drag on, the temperature across the evaporator changes and suction pressure falls | Yes, usually days to weeks ahead |
| Dirty condenser | Condensing pressure and current rise, especially on warm days | Yes, often weeks ahead |
| Fan faults | The temperature difference across the evaporator or condenser changes, and pressure follows | Often, when the fan wears gradually |
| Sudden electrical faults | Nothing changes before the fault | No |
| Mechanical failure without warning | Nothing changes before the failure | No |
Compressor wear is usually the most expensive fault. A compressor with worn bearings or valves uses more power to move the same amount of refrigerant. The rise is tiny from one day to the next. Over weeks, Maci Intelligence can see it, because it compares the readings with how that particular compressor normally runs at the same load and outdoor temperature.
A shortage of refrigerant shows in the pressures. A small leak makes suction pressure fall gradually, and the system copes for a long time before the room warms up. Caught early, the leak can be found and sealed before the charge has gone. Read more about refrigerant and leaks.
Which refrigeration faults can AI not predict?
Some faults give no warning in current, pressure or temperature. These include sudden electrical faults, such as a contactor burning out, a tripped breaker, a loose connection or a power cut in the building. They also include mechanical failures without warning, such as a pipe cracking from vibration or damage to the system from outside.
Maci Intelligence cannot predict those faults, and an honest supplier should say so. Maci does see them the moment they happen, because the readings change at once. The alarm goes out in the app, by SMS and email, and if nobody responds it moves to the next person on the list. See how refrigeration alarms and escalation work.
How long does a refrigeration system and its compressor last?
Many commercial refrigeration systems run for 10 to 15 years, and a compressor can last as long if it is not overworked. Lifespan depends mostly on how the system runs: a dirty condenser, too little refrigerant, frequent starts and high condensing temperatures all wear the compressor every day.
Predictive maintenance extends lifespan because the faults that cause wear are found early. A condenser cleaned as soon as the current starts to rise spares the compressor months of running at too high a pressure. Operations shows where a system uses more energy than it should.
What does planned servicing save compared with emergency call-outs?
An emergency call-out is an expensive way to get a technician on site. In Denmark, a typical call-out is about 15 minutes of work and costs around 2,700 DKK (about €360) excluding VAT, before the repair and parts. If the technician does not have the right part, it becomes two trips. A planned visit in working hours can be combined with other jobs, and the goods never get warm.
Whether predictive maintenance pays off for you depends on what your breakdowns cost today. Our article Does predictive maintenance pay off? walks through the sum step by step. The price of Maci Intelligence depends on the number of systems and sensors, and you receive a quote after a short review.
Facility management companies running refrigeration for many clients can see how this works across a whole portfolio on the page about refrigeration monitoring for facility management.
How do you get started with predictive maintenance?
The sensors are fitted
Maci fits sensors at several points on your existing systems, whatever the make. Maci reads nothing from the controller, and data is sent over a wired network or a small LTE modem.
The AI learns the system
Maci Intelligence learns how each system normally runs at different loads and outdoor temperatures.
A warning with a cause
When a system starts to drift, you are told the likely cause and how much time there is likely to be.
A planned visit
The technician comes in working hours, prepared and with the right part. Maci monitors the systems and does not control them.
Every system can be followed on one dashboard. Read more about what refrigeration monitoring measures, and what to do if a system fails anyway on the page about refrigeration breakdowns.
Questions and answers
What is the difference between preventive and predictive maintenance?
Preventive maintenance follows the calendar: a technician visits on fixed dates whatever the system’s condition. Predictive maintenance follows the system’s readings and plans the service when the data shows something developing. The two work best together.
Can AI predict refrigeration faults?
Yes, the faults that develop gradually, such as compressor wear, low refrigerant, icing and a dirty condenser. Maci Intelligence typically warns 3 to 6 weeks before a breakdown. Sudden electrical faults and mechanical failures without warning cannot be predicted, but Maci raises the alarm the moment they happen.
Does predictive maintenance replace the mandatory leak checks?
No. Leak checks under the F-gas Regulation must still be carried out by a certified technician and recorded in the log. Maci Intelligence can see signs of low refrigerant between checks, so a leak is found sooner.
Do we need to change refrigeration contractor?
No. Maci Intelligence is fitted to your existing systems, and your current contractor can receive the warnings and see the data. Many contractors use the warnings to plan their visits better.
Can an old refrigeration system be monitored?
Yes. The sensors are fitted to the outside of the system whatever its make and age, and Maci reads nothing from the controller. Older systems often have the most to gain, because wear is more common.
What does predictive maintenance with Maci cost?
The price of Maci Intelligence depends on the number of systems and sensors, and you receive a quote after a short review of your systems. Maci Service, with QR tags and service history, is free.
How soon can Maci spot faults on a newly fitted system?
Maci Intelligence first has to learn the system’s normal behaviour. Large deviations and stops are alarmed from day one, while the small, gradual changes become clearer as Maci gets to know the system.