Maintenance
People often ask what they are actually paying for when they book an air conditioning service. It is a fair question. From the outside it can look like an engineer turns up, has a look at the unit and leaves. There is a good deal more to it than that, and knowing what a proper service involves helps you judge whether yours is being done thoroughly.
This guide walks through what happens during a full service the way we carry it out at Air Con North, from the moment we open the unit to the report you are left with. It applies to both homes and businesses, with the commercial visit adding a layer of F-Gas work that domestic systems do not always need.
Before we start
A good service begins with a quick conversation and an observation. We want to know how the system has been behaving, whether you have noticed anything unusual, any noises, smells, weak cooling or error codes. Then we run the system to see it working, note the temperatures it is achieving and listen to how it sounds. That gives us a baseline before we open anything up, and it often points us straight at anything that needs closer attention.
We also take a moment to protect the area. The dust and condensate that come out of a neglected unit are not something you want over your floor or furniture, so we lay down protection and work cleanly. It sounds minor, but it is part of treating your home or premises with respect, and it is one of the things that separates a proper service from a rushed once-over.
Filters and air path
The filters are the first thing we reach. We remove them, clean or replace them as needed and check the air path behind them. This is the part you can do yourself between visits, but at a service we go further, checking that the filters are seating correctly and that nothing has been missed behind them.
A clean air path is the foundation of everything else. If air cannot move freely through the unit, nothing downstream works as it should, so this step matters more than its simplicity suggests.
Coils and heat exchange
Behind the filters sit the coils, the finned metal surfaces where the heat exchange actually happens. Over time these gather a film of dust and grime that filters do not catch, and a dirty coil is one of the biggest drains on efficiency. We clean the indoor coil carefully, using the right products rather than anything that would damage the delicate fins, and we straighten fins where we sensibly can.
A clean coil transfers heat the way it was designed to, which is what lets the system cool or heat quickly without overworking. This is one of the clearest differences a professional service makes that you simply cannot replicate with a filter clean.
Where a coil has become badly fouled, or where mould and bacteria have taken hold, we can carry out a deeper sanitising clean rather than a surface wipe. This tackles the biological growth at the root, which is the only way to properly clear the musty smells that come with it. A deodoriser simply covers the problem for a day or two. Cleaning the coil and the drain that serves it removes the cause, and it makes a noticeable difference to the air coming off the unit afterwards.
Fans, motors and drainage
We check the fans at both the indoor and outdoor units. We look at the condition of the blades, listen and feel for worn bearings, and make sure the motors are running smoothly without excessive vibration or noise. A fan that is starting to fail often gives itself away well before it stops, and catching that at a service means a planned part swap rather than a breakdown on the worst possible day.
Drainage
Air conditioning produces condensation, and that water has to drain away cleanly. Blocked drains are one of the most common faults we see, and they cause the dripping and water damage that catches people out. During a service we check the drain pan and the condensate drain, clear any build-up and make sure water is flowing away as it should. On systems with a condensate pump we check that too.
It is unglamorous work but it prevents a lot of grief, from stained ceilings to the musty smells that come from standing water.
Refrigerant and pressures
The refrigerant is the lifeblood of the system, and its charge and pressures tell us a great deal about the system’s health. We check the operating pressures and temperatures against what they should be for that system. Readings that are out of range point to problems such as a low charge, which usually means a leak somewhere, or a blockage.
This is firmly engineer territory. The refrigerant side is sealed and must only be worked on by a qualified F-Gas registered engineer, both for safety and by law. It is also where a lot of hidden efficiency problems hide, which is why it is a core part of any genuine service.
A common misunderstanding is that refrigerant is used up over time, like fuel, and simply needs topping up now and then. It is not. In a healthy sealed system the same refrigerant circulates for the life of the unit. So if the pressures show the charge is low, it means the gas is escaping somewhere, and the proper response is to find and fix that leak rather than keep refilling it. Checking the pressures at a service is how we catch a slow leak early, often long before it has robbed enough performance for you to notice.
Electrical and control checks
With the covers open we inspect the electrical side. We check connections for signs of overheating or looseness, look over the contactors and components, and make sure everything is secure and in good condition. Loose or corroded connections are a common cause of intermittent faults and, left unchecked, a genuine safety risk.
We also test the controls. We run the system through its modes, check the thermostat and sensors are reading correctly and confirm the remote or wall controller is doing what it should. A system that is misreading the room temperature will never perform well no matter how clean the rest of it is.
On systems with timers, schedules or smart controls we check those are set sensibly too. It is surprising how often we find a unit quietly running out of hours because of a forgotten schedule, or fighting against a setting nobody remembers changing. Putting the controls right can be one of the simplest ways to improve both comfort and running costs, and it costs nothing but a few minutes of the engineer’s time.
The outdoor unit and leak checks
The outdoor unit takes a beating from the weather, especially at exposed or coastal sites around the North-East. We clear debris from around it, clean the coil, check the fan and casing and make sure it has the clear airflow it needs. We also inspect the pipework and insulation between the indoor and outdoor units.
Leak checking is a key part of the visit. We look for signs of refrigerant escaping, both because a leak quietly wrecks performance and because, for businesses, there is a legal duty around it.
We also check the mounting and pipework insulation at the outdoor unit while we are there. Brackets can work loose over years of vibration, and the foam lagging on the pipes perishes in the weather and sunlight, which costs efficiency and invites corrosion underneath. These are small things to put right during a routine visit but the kind that quietly cause trouble if nobody ever looks. A unit sat low to the ground also wants checking for standing water or debris packed underneath it, both of which shorten its life.
The F-Gas record for commercial systems
On a commercial system holding enough refrigerant to fall under the leak-checking requirements of the UK F-Gas Regulation, the leak check is not just good practice, it is a legal obligation, and it has to be recorded. As an F-Gas registered company we carry out those checks properly and keep the records that prove your compliance. That paperwork matters if your business is ever asked to demonstrate it has met its obligations, and it is something a domestic visit will not usually involve.
The report and how long it takes
At the end of the visit you should know exactly what was done and what, if anything, needs watching. We talk you through what we found, flag anything that is wearing or will want attention before the next visit and leave you with a record of the service. For commercial clients that includes the F-Gas documentation.
That record is worth keeping. It supports your manufacturer warranty, which usually depends on evidence of regular servicing, and it builds a history of the system that makes future diagnosis quicker. A service without a clear outcome is only half a service. Keep the records together in one place, as over the years they tell the story of how your system is ageing and flag when a unit is heading towards replacement.
How long it takes
For a single domestic split unit a thorough service typically takes somewhere around an hour, though a neglected system that needs a proper deep clean can take longer. Multi-split systems and commercial installations with several indoor units naturally take more time, as does a site with a lot of equipment to work through. We would always rather take the time to do it properly than rush and miss something, because the whole point of a service is to catch the small things before they become big ones.
That last point is really the heart of why a service is worth having. Almost nothing we find at a routine visit is dramatic on the day. It is a drain starting to silt up, a connection working slightly loose, a fan bearing that has just begun to whisper, a refrigerant charge that has crept a fraction low. Left for another year any one of those can become the fault that leaves you without cooling on the hottest day or without heating in the depths of winter. Caught at a service they are minor, planned and cheap to put right. You are not really paying for the hour on the day, you are paying to avoid the breakdown that would otherwise be waiting for you.
If we do find something that needs attention beyond the service itself, we will explain it plainly, tell you how urgent it really is and let you decide. There is no hard sell. Some findings genuinely need sorting there and then, others are simply worth keeping an eye on until the next visit, and a good engineer will be honest about which is which rather than turning every observation into alarm.
Talk to Air Con North
If it has been a while since your system had a proper going-over, or you have never quite known what a service should include, now you do. Our F-Gas registered engineers service homes and businesses across the North-East, from Newcastle, Gateshead and Sunderland to Durham, Middlesbrough and Carlisle, and we do the full job rather than a quick look. Call us free on 0800 246 5430 to book a service and we will arrange a visit that suits you.
