🎄Get your new air conditioner installed before Christmas! Order deadline - December 15th. Book now before time runs out

Book Now

Air Con Fault Finding, the Easy Way

Air conditioning systems are complex appliances that require regular servicing and maintenance to prevent them from breaking down. If your air con is not performing up to standard, your first instinct might be to call an expert. But before picking up the phone, take a look at these common air con faults—the problem may be simpler than you think! 

Carrying out your own air con fault finding work, and being able to troubleshoot these faults, can save you time, money, and get your air con back up and running quickly.

Common Air Con Faults

It’s critical that air con units are serviced annually, but these simple problems can build up quickly, so regularly checking your air con for faults is the best way to keep it working all year round.

Some simple problem-solving tips include:

Air Con Fault Finding in Ducted Systems

Ducted air con systems have an indoor unit, an outdoor unit, ceiling vents and a wall-mounted controller. If your air con system is not heating or cooling the way it should be, the first thing to do is check the controls. Is the temperature at the right setting? While it sounds simple, there are a lot of reasons the temperature may be off. Similarly, with most ducted systems, you are able to control how much air is flowing out of certain vents, so if you feel your air con is weaker than usual, check the zone controls, and ensure the air flow is set to 100%.

If you’re questioning the cleanliness of the air coming out of your system, make sure that your vents themselves are clean (as well as checking your filters). Regardless of the style of vents you have, dust can collect on them, and then be blown back into the room by the air conditioner.

Air Con Fault Finding in Split Systems

Split systems have one or more wall-mounted units (the indoor unit), an outdoor unit, and a remote controller. There is also a power isolation switch (different from normal power points), usually located outside, and this is the first thing to check if your air con is not working properly. While it sounds obvious, it’s common for kids or pets to knock the plug out of place.5

Again, another big culprit for faults in split systems are dirty filters, which you should clean regularly to keep the unit in good working condition.

While these common air con faults can usually be easily fixed by yourself, safety is always the most important thing. If you feel unsafe or unsure of anything regarding your air con system, call a professional. They have the qualifications, knowledge and safety training to get your air con back up and running as soon as possible, without any risk to yourself or your system. 

There’s certain components of an air conditioner that only a professional can help with, such as checking refrigerant levels, the electrical controls, the condensate drain, evaporator and condenser coils, and much more. Making sure you get your air con regularly serviced is the best way to avoid major problems with your system.


  1. Mary Farrell, 2020, 8 Air Conditioner Problems and How to Fix Them, Consumer Reports.
  2. 2018, Don’t Forget the Filters: The Key to an Energy Efficient Home, Daikin. 
  3. Michael Rosone, 2019, Top 7 Causes of Air Conditioner Problems and How to Prevent Them, Arista Air. 
  4. John White, 2019, Common Air Conditioning Problems You Should Know About, White Mechanical, Inc.
  5. Veronika Hleborodova, 2018, Why is My Air Conditioner Not Working?, Canstar Blue.
  6. Feature image by  by Vladislav Nikonov on Unsplash