Some DIY tips for keeping your air conditioning in good condition
At Moulton Air Conditioning Northampton, we do not recommend skipping your manufacturers advice on having your air conditioning serviced by a professional, but there are some routine maintenance tasks that you can do to compliment this.
1. Start by Checking Your Manufacturer’s Instructions
Before cleaning your split system air conditioner, take a few minutes to find the manufacturer’s instructions for your particular model. This simple step is often overlooked, yet different systems can have different filter designs, cleaning requirements and maintenance features. A wall-mounted Mitsubishi Electric unit may not be identical to a Daikin, Fujitsu, Panasonic, LG or Rinnai system. Even when two units look almost identical from the outside, their filters and internal components can differ considerably. Mitsubishi Electric specifically recommends consulting the instruction manual when accessing or cleaning an air conditioner, while Daikin provides model-specific instructions for its split-system filters.
Your manual should tell you which components are designed for homeowner maintenance and which should be handled by an authorised technician. It may also provide specific information about washable filters, disposable filters, deodorising filters and other filtration components. Never assume that a component can be washed simply because it looks like a conventional mesh filter. Some specialist filters may require vacuuming, replacement or a particular cleaning method. Your manual is also the best place to check whether your system has a self-cleaning, fan-only or dry-out function.
A few minutes spent reading the instructions can prevent accidental damage. You should also check the warranty information before using cleaning products or attempting anything beyond basic cleaning. When in doubt, keep your maintenance routine simple: switch the system off, clean the accessible filters according to the instructions, wipe accessible surfaces and keep the outdoor area clear.
2. Turn the Air Conditioner Off Before Cleaning
Safety should always come before convenience when carrying out air conditioner maintenance at home. Never clean an operating air conditioner, particularly when your hands could come into contact with moving parts, electrical components or water. Manufacturer guidance commonly instructs homeowners to switch the appliance off before removing and cleaning filters. Panasonic, for example, advises switching the air conditioner off before accessing its filters.
Using the remote control to stop the system is a sensible first step, but you should follow your manufacturer’s instructions regarding electrical isolation before performing maintenance. If you are unsure how your particular system should be isolated safely, do not experiment. A split system contains electrical equipment, and the outdoor unit contains components that homeowners should not dismantle or interfere with.
There is also an important distinction between cleaning the parts designed for homeowner maintenance and opening the air conditioner itself. Removing a washable filter is normal household maintenance. Removing electrical covers, dismantling the indoor fan assembly or attempting to access refrigerant components is a completely different matter. The safest approach is to stay within the maintenance procedures described in your manual. If something requires tools, electrical knowledge or access behind protective covers, it is usually time to contact a qualified professional.
3. Clean the Indoor Air Filters Regularly
The air filters are probably the most important part of your split system that you can routinely maintain yourself. Their job is to capture dust and other airborne particles before air passes deeper into the system. Over time, the filters become coated with dust, especially if the air conditioner is used frequently, the home is dusty or there are pets in the household. Once the filter becomes heavily clogged, airflow can be restricted and the air conditioner may have to work harder to move air through the system. Australian government energy guidance states that dirty filters significantly reduce airflow and energy efficiency.
How frequently you should clean them depends on your system, environment and usage. Some guidance recommends cleaning filters every couple of weeks during periods of heavy use, while individual manufacturers may specify seasonal or monthly cleaning. The Australian Government’s energy advice recommends cleaning filters every two weeks during use, while Daikin’s instructions for one L-Series system recommend cleaning filters every season.
That difference is important because there is no single cleaning schedule suitable for every home. Inspect your filters regularly and let their condition guide you. If you open the indoor unit and see a thick layer of grey dust covering the mesh, it is time to clean them regardless of what the calendar says. Regular inspection is more useful than blindly following a timetable.
4. How to Wash Split System Filters
Once the air conditioner has been safely switched off, open the front panel according to the manufacturer’s instructions and carefully remove the filters. Avoid forcing anything. If a filter does not slide out easily, check the manual because there may be tabs or clips that need to be released first. Daikin, Panasonic and LG all provide guidance involving removal, cleaning and thorough drying of filters.
Many washable filters can be cleaned using water, although the exact procedure depends on the manufacturer. Panasonic advises washing filters with water and using mild detergent where necessary for particularly dirty filters. It also warns against harsh chemicals and aggressive scrubbing. LG similarly recommends warm water and mild detergent for appropriate filters.
After washing, allow the filters to dry completely before reinstalling them. Do not rush this stage. Putting damp filters back into the air conditioner can contribute to unwanted moisture inside the system. Manufacturers commonly recommend drying filters in the shade rather than exposing them to direct sunlight. Daikin, for example, specifically advises drying filters in the shade.
Once completely dry, replace the filters exactly as instructed. A filter should never be left out while the system operates unless the manufacturer specifically says otherwise.
5. Vacuum Dust From Filters When Appropriate
Washing is not always the only option. Some filters can be gently vacuumed to remove loose dust before washing, while certain specialised filters may be designed to be cleaned using a vacuum rather than water. Daikin’s guidance for its L-Series system states that filters can be washed with water or cleaned using a vacuum cleaner.
Vacuuming can be particularly useful when a filter has a light layer of dust but does not require a complete wash. Use care, because filter materials can be delicate. A powerful vacuum nozzle pressed hard against a fine filter may damage the material. Instead, follow the manufacturer’s instructions and use gentle suction where appropriate.
This is another reason not to treat every split system as though it were identical. Your neighbour’s cleaning routine may not be suitable for your particular model. The safest approach is always to combine general maintenance principles with the manufacturer’s specific instructions. If your manual says that a filter should be washed, wash it. If it says that a specialised filter should be replaced rather than cleaned, replace it.
The goal is simple: maintain unrestricted airflow without damaging the filtration material.
6. Wipe the Indoor Unit and Air Louvres
Once the filters have been removed, take the opportunity to clean the accessible exterior surfaces of the indoor unit. Dust can accumulate around the front panel, air inlet and discharge louvers. A soft, slightly damp cloth is usually sufficient for ordinary surface dust, provided this agrees with the manufacturer’s instructions.
You do not need to make the indoor unit sparkle like a showroom appliance. The objective is to remove surface dust and prevent unnecessary build-up around the air inlet and outlet. Avoid spraying cleaning products directly into the unit. Liquid can travel into areas where it does not belong, potentially causing damage to electrical components.
Pay particular attention to the louvres because these direct conditioned air into the room. If dust has accumulated heavily around them, gently wipe the accessible surfaces rather than forcing cloths deep inside the machine. Never poke tools, cloths or other objects into areas that you cannot see clearly.
A simple wipe during regular household cleaning can make this task almost effortless. Rather than allowing dust to build up for months, include the air conditioner in your normal cleaning routine.
7. Keep the Indoor Airflow Clear
A clean filter will not help much if the air cannot circulate freely around the indoor unit. Look at the area directly in front of the air conditioner and make sure furniture, curtains or other objects are not obstructing the airflow. The indoor unit needs to draw room air in and discharge conditioned air effectively.
This is especially relevant in bedrooms and living rooms where furniture arrangements sometimes change. A tall cabinet, curtain or decorative object placed directly below or in front of the unit can interfere with air distribution. You might still feel cool air, but the system may not distribute it evenly around the room.
Think of the air conditioner as breathing. The inlet needs to draw air in, while the outlet needs space to push conditioned air out. Blocking either side makes the job harder.
Good airflow also helps the system maintain comfortable temperatures without unnecessary operation. While cleaning the filters, therefore, take a moment to look around the unit and consider whether anything has gradually moved into its airflow path.
8. Keep the Outdoor Unit Free From Leaves and Vegetation
The outdoor condenser is easy to forget because it sits outside the living space. Yet it is an essential part of the split system. It releases heat from the refrigerant circuit when the system is cooling and needs adequate airflow to operate effectively. Leaves, grass, weeds, garden debris and other obstructions can accumulate around the unit.
Energy.gov.au recommends keeping the area around an outdoor compressor clear for proper airflow. Panasonic similarly advises checking the area around the outdoor unit for obstructions and ensuring that the unit remains stable.
Homeowners can generally remove loose leaves, weeds and debris from around an accessible outdoor unit. You should not dismantle the unit or interfere with electrical components. The objective is simply to maintain a clear space around it.
If vegetation is growing close to the condenser, trim it back so leaves and branches do not continually fall against the unit. This is especially useful during autumn or after periods of strong wind. A few minutes with a broom or garden tool can prevent a much larger build-up later.
9. Do Not Pressure-Wash the Outdoor Unit Unless Your Manual Allows It
Pressure washers are excellent for many outdoor cleaning jobs, but your air conditioner is not a driveway. High-pressure water can potentially damage delicate fins and may force water into areas where it does not belong. For ordinary homeowner maintenance, gentle cleaning and removal of loose debris are safer approaches unless the manufacturer specifically provides instructions for more intensive cleaning.
CHOICE recommends cleaning the outdoor unit with a soft brush or broom and removing vegetation, obstructions and spider webs. Panasonic likewise recommends checking the outdoor unit and its surroundings rather than simply attacking it with aggressive cleaning equipment.
If the outdoor coil is visibly dirty or clogged deep inside the fins, that is a good reason to arrange professional maintenance. A technician has the appropriate equipment and knowledge to clean the condenser without damaging it.
The same principle applies to cleaning chemicals. Do not assume that a general-purpose household cleaner is suitable for air conditioning components. Chemicals can potentially damage metals, coatings and plastics. When manufacturer guidance does not specifically recommend a product, plain, gentle maintenance is usually the better choice.
10. Check the Outdoor Unit’s Surroundings After Storms
Strong winds can bring leaves, branches and other debris into the area surrounding your outdoor condenser. After storms, it is sensible to perform a quick visual check. Look for anything that has fallen against the unit or blocked the airflow around it.
Do not climb onto unstable surfaces to reach the unit. If the condenser is mounted at height, leave anything beyond safe ground-level access to a professional. Panasonic specifically qualifies its outdoor-unit inspection advice by saying it should only be performed where the unit can be accessed safely.
You should also look for obvious physical damage. A damaged casing, displaced component, exposed wiring or severely bent coil should not be treated as a DIY repair. Switch the system off if necessary and arrange an appropriate inspection.
A visual check takes very little time, but it can identify problems before you attempt to run the system heavily during extreme weather.
11. Keep the Condensate Drain Area Under Observation
Split system air conditioners produce condensation during cooling. That moisture needs to drain away correctly. Depending on the installation, you may be able to see part of the drain pipe outside the property. A visible drain outlet that is dripping during cooling can be normal, while water appearing in the wrong place can indicate a drainage problem.
Some manufacturers provide homeowner guidance for checking accessible drain areas. LG, for example, advises checking the drain line where it can be safely accessed and warns that blocked drainage can contribute to water backup and mould growth.
However, homeowners should not automatically start dismantling drain systems. If water is leaking from the indoor unit, the drain is blocked, or you cannot safely identify the cause, arrange professional attention.
A simple observation is enough for routine maintenance. You are looking for changes from normal behaviour. If your system has always discharged a small amount of water outside during cooling and suddenly begins leaking indoors, something has changed and should be investigated.
12. Use Fan-Only or Dry Functions When Recommended
Some split systems include a fan-only, self-cleaning or drying function designed to reduce moisture remaining inside the indoor unit. CHOICE recommends occasionally running a system in fan-only mode to help evaporate internal moisture, particularly when the system is used regularly.
This can be particularly useful after extended cooling operation in humid conditions. Moisture is a normal part of air conditioning, but persistent moisture combined with dust can contribute to unpleasant odours and microbial growth.
Not every air conditioner has the same functions, so check the manual before using a specific cleaning or drying mode. If your model has a dedicated self-cleaning or coil-dry function, follow the manufacturer’s instructions rather than improvising a process.
Think of this as allowing the system to finish its job properly. Cooling removes heat from the room, but the system also handles moisture. Giving the indoor components an opportunity to dry can form part of a sensible maintenance routine.
13. Watch for Changes in Cooling or Heating Performance
Routine maintenance is not only about cleaning. It is also about noticing changes. If your split system previously cooled a room quickly but now takes considerably longer, that is useful information. Similarly, weak airflow, unusual smells, water leaks, ice formation or repeated shutdowns should not simply be ignored.
A dirty filter is one possible cause of poor airflow, which is why cleaning the filter should be one of the first basic checks. However, if the problem remains after cleaning, the cause may be deeper inside the system. Components such as coils, blower wheels and drainage systems can require professional cleaning or inspection. CHOICE notes that professional maintenance may include internal components such as coils, fins and drainage.
Do not repeatedly clean the filters and assume every performance problem has been solved. Maintenance is about recognising the boundary between simple household care and technical repair.
A change in performance is the air conditioner effectively telling you that something is different. Listen to it.
14. Pay Attention to Unusual Smells
A strange smell coming from a split system should not automatically be dismissed as normal. Sometimes odours are related to dust or moisture inside the unit. Cleaning the accessible filters and surfaces may help when the cause is straightforward, but persistent or strong smells require further investigation.
A musty smell can indicate moisture and contamination inside areas that homeowners cannot safely reach. Daikin notes that dirty filters can contribute to odour and poor heating or cooling performance.
Do not spray perfume, air freshener or household disinfectant into the air conditioner to mask the smell. This does not address the underlying cause and could potentially damage components.
A burning smell deserves particular caution. Switch the system off and seek professional advice rather than continuing to operate it. Electrical faults are not suitable DIY maintenance jobs.
The important lesson is simple: cleaning is maintenance, not a substitute for diagnosis.
15. Check for Unusual Noises
Most air conditioners make some noise. Fans run, compressors operate and plastic components can expand or contract as temperatures change. However, you know your system’s normal sounds better than anyone else, so a sudden change can be significant.
Listen for grinding, scraping, persistent rattling, unusual buzzing or other noises that were not previously present. A loose object outside the unit may sometimes be responsible, but internal mechanical or electrical problems can also produce unusual sounds.
Homeowners can perform a visual inspection of accessible areas and make sure nothing obvious is obstructing the outdoor unit. Do not remove covers to investigate an internal noise.
If the sound persists, contact a qualified air conditioning professional. Continuing to run a system that is making a severe mechanical noise may turn a relatively straightforward repair into a more expensive one.
The biggest mistake in DIY air conditioner maintenance is assuming that cleaning means dismantling. It does not. Homeowners can generally handle routine tasks such as cleaning accessible filters, wiping external surfaces and keeping the outdoor area clear, but technical components should be left to qualified professionals.
Do not attempt to recharge refrigerant, disconnect refrigerant pipes, open electrical compartments, repair wiring or dismantle the refrigeration circuit. These tasks require specialist knowledge, equipment and appropriate licensing.
Professional servicing can also reach parts of the system that ordinary household cleaning cannot. Internal coils, blower wheels, drainage components and other areas can accumulate contamination over time. When these components need cleaning or inspection, booking a qualified technician is safer than turning a simple maintenance job into an accidental repair.
The best DIY maintenance is therefore often knowing what not to touch. Contact Us at Moulton Air Conditioning Northampton for a professional service.