Air Conditioning Not Working Properly? When It Is Time for a Service or a Repair

If your air conditioning isn’t working as it should, the first step is understanding what’s gone wrong: does it need a service, or a repair? The symptoms your system is showing are usually the best starting point for telling the two apart.

For London homeowners with an installed air conditioning system that’s lost performance, this guide explains the difference between servicing and repairs, the common faults to look out for, and when each one applies. We’ll also explain when to arrange a routine service, when a repair may be needed, and how planned preventative maintenance from Calibre can help keep your system running efficiently and reliably.

Servicing and repair: What's the difference?

Air conditioning servicing and repairs all help keep your system working properly, but each serves a different purpose. Understanding what separates them can help you decide what your system needs and when to call a professional.

What is air conditioning servicing?

Air conditioning servicing is a planned visit from a qualified engineer to inspect, clean and check the system’s performance. Also known as planned preventative maintenance (PPM), an annual service helps identify wear, build-up and developing faults before they cause bigger problems, supporting efficiency, reliability and a longer system lifespan. Regular servicing is particularly important for systems that see heavy use.

Servicing is carried out by a qualified engineer and is not a DIY task. The appropriate maintenance schedule will depend on the system and how it is used.

What is air conditioning repair?

Air conditioning repair involves diagnosing and fixing a fault that is preventing the system from working correctly. This usually requires a reactive visit from a specialist aftercare team, particularly if the unit has stopped cooling, is leaking, is repeatedly switching off or is making unusual noises. Depending on the fault, the repair may be completed during the visit or require replacement parts.

Air conditioning systems contain refrigerants that may be flammable, so maintenance and repairs must be carried out by appropriately trained and certified professionals. Attempting repairs yourself, or using someone without the necessary qualifications and experience, can create safety risks, damage the equipment and potentially invalidate the manufacturer’s warranty. If your system develops a fault, contact the company responsible for maintaining it so they can arrange for the appropriate aftercare team to investigate.

How do servicing and repairs overlap?

Servicing and repairs often overlap. A service can uncover a worn or failing component that needs a repair, and a repair call-out may reveal that a lack of regular servicing has contributed to the fault. Regular servicing can help identify potential issues early, but it cannot prevent every fault or eliminate the need for repairs.

Rather than trying to identify the right category straight away, start with what your air conditioning is actually doing. The symptoms below can help indicate whether it’s likely to be addressed at your next service or whether it needs an engineer out sooner.

What is your air conditioning doing? A quick symptom guide

The symptoms your air conditioning system shows can help you work out whether it’s likely to be resolved at a routine service or whether it needs a professional repair. Some issues have straightforward causes, such as a dirty filter or an aging component, while others point to a fault that needs an engineer’s attention.

These are common causes rather than definitive diagnoses. Several different problems can produce similar symptoms, so a qualified engineer should assess the system and recommend the appropriate next step.

If your air conditioning continues to underperform, develops a new fault or shows signs of damage, contact a qualified engineer rather than assuming a routine service alone will resolve the issue.

When a service will fix it and when you need a repair

Gradually declining performance often points to an overdue service, while sudden faults are more likely to require a repair. However, symptoms alone cannot reliably determine the cause. A qualified engineer can assess the system and establish what work is needed.

When an air conditioning service will help

A service may help if your system is becoming less efficient or showing signs of dirt and moisture build-up. Common indicators include:

• ‍Reduced cooling: The system struggles to reach the desired temperature.‍
• Unpleasant smells: Dirt and moisture have accumulated inside the unit.
• Higher energy bills: The system is using more energy than usual.

A professional service includes cleaning, inspections and performance checks to help maintain efficiency and identify potential problems early. If the engineer identifies a fault that requires work beyond routine maintenance, they can advise on the appropriate next steps.

When you need an air conditioning repair

Sudden breakdowns, persistent faults, leaks and anything that doesn’t improve after a service may require a repair.

If your air conditioning develops a fault, contact the company responsible for maintaining the system. They can arrange a visit from their specialist aftercare team, whose appropriately trained and certified engineers can investigate the issue and recommend the necessary work.

During a call-out, an engineer will:

• ‍Diagnose the fault and identify the cause.‍
• Carry out repairs where possible, provided the necessary parts are available.‍
• Recommend next steps if parts need ordering or further work is required.

Do not attempt electrical, refrigerant or internal repairs yourself, or arrange for someone without the appropriate qualifications and experience to carry them out. If you notice smoke, sparking or a burning smell, switch the system off if safe and seek professional assistance.

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How to avoid air conditioning problems in future

Regular servicing is one of the best ways to keep your air conditioning running efficiently and reduce the risk of unexpected breakdowns. An annual service is a good starting point, although the appropriate maintenance schedule depends on the equipment, manufacturer recommendations and how heavily it is used.

Between service visits, pay attention to changes in performance. If you notice unusual noises, unpleasant smells, leaks or reduced cooling, report the issue to the company responsible for maintaining your system. They can arrange for their aftercare team to investigate and determine whether servicing or a repair is required. Avoid attempting to diagnose or resolve internal faults yourself, as this can create safety risks, damage the equipment and potentially affect the manufacturer’s warranty.

For added peace of mind, Calibre offers planned maintenance agreements to help keep your system in good working order and identify potential problems before they become costly repairs.

If your air conditioning isn’t performing as it should, Calibre can help establish whether it needs routine servicing or a repair. Calibre’s specialist team can assess your existing installation, investigate potential faults and recommend the appropriate work for your system.

Whether you need to arrange your annual service or report a developing fault, contact Calibre to discuss your air conditioning servicing and repair requirements. The Calibre team can advise on the next steps and arrange the appropriate support for your installation.