Air Conditioner Not Cooling in Perth: Causes and Fixes
An air conditioner not cooling on a hot Perth day is frustrating, and the cause can be anything from a dirty filter to a refrigerant problem. If your air conditioner is not cooling, some checks are simple and some need a professional. Here are the common causes and what to do.
Start with the simple things
When an air conditioner is not cooling, start with the basics: check the thermostat or remote settings, make sure it is in cooling mode and set low enough, and confirm it is actually running. It sounds obvious, but wrong settings are a surprisingly common reason a system seems to have stopped cooling.
6 common causes of an air conditioner not cooling
- A dirty or clogged filter restricting airflow
- Low refrigerant, often from a leak
- Dirty coils on the indoor or outdoor unit
- A blocked or dirty outdoor unit
- Thermostat or settings issues
- A worn capacitor or fan fault
Dirty filters
The most common cause of an air conditioner not cooling is a clogged filter. Dust builds up, restricts airflow, and the system cannot move enough cool air. Cleaning or replacing the filter is something you can do yourself, and it often restores cooling straight away. It is always the first thing to check.
The outdoor unit
An air conditioner not cooling can be down to the outdoor unit, blocked by leaves, dust or debris, or sitting in the hot sun with no airflow. Clearing space around it and gently removing debris can help. If it is caked in grime or not running, it needs a professional clean or check.
Low refrigerant
If the basics are fine but the air conditioner is not cooling, low refrigerant is a likely cause, and it usually means a leak. This is not a DIY fix: handling refrigerant is licensed work. A professional finds and repairs the leak and recharges the system, restoring proper cooling safely and correctly.
Electrical faults
Sometimes an air conditioner not cooling comes down to an electrical fault, a failed capacitor, a faulty fan motor, or a tripped circuit. These need a qualified professional to diagnose and repair safely. If your system is not running at all, or trips the power, an electrical issue is a likely culprit.
When to call a professional
If cleaning the filter and clearing the outdoor unit does not fix an air conditioner not cooling, it is time to call a professional. Refrigerant, coils and electrical components need proper tools and licences. Getting it looked at promptly stops a small issue becoming a bigger, costlier repair mid-summer.
Preventing it
Much of what causes an air conditioner not cooling is preventable with regular servicing: clean filters and coils, checked refrigerant, and a system that is maintained. An annual service before summer keeps cooling strong and catches the faults that would otherwise leave you sweating on the hottest day.
Warm air from the vents?
If the system runs but blows warm or room-temperature air, that points to a refrigerant or compressor issue rather than a simple airflow one. It is a sign to book a professional, since these are not DIY fixes and running the system in that state can make things worse.
Ice on the unit
Ice forming on the indoor coil or the pipes is another clue, often caused by low refrigerant or restricted airflow. If you see ice, turn the system off to let it thaw and book a service, running it iced up can damage the compressor.
Why use a licensed professional
Diagnosing an air conditioner not cooling can involve refrigerant and electrical work, which is licensed. A licensed professional finds the cause and fixes it safely and correctly. The state’s Building and Energy sets the electrical standards involved.
Air conditioner not cooling in Perth?
ACS Electrical diagnoses and fixes cooling problems across the metro. Explore our split system air conditioning service, air conditioner servicing guide or electrical maintenance and repairs service. Call 0419 967 838.
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