When the Aussie summer hits full swing, there’s nothing quite like walking into a cool, air-conditioned space. But what happens when your air conditioner isn’t working as it should? Whether it’s a minor annoyance or a full-blown breakdown, air con issues can quickly turn your comfort into chaos. Here are 10 common air conditioning problems — and how to fix them — so you can stay cool all year round.
The Unit Won’t Turn On
Problem: You press the remote, but nothing happens — no hum, no cool air.
Fix: First, check your power source. Ensure the circuit breaker hasn’t tripped and that the remote batteries are working. If everything looks fine and the unit still doesn’t respond, it could be an internal electrical issue that needs a professional diagnosis.
Not Cooling Properly
Problem: The unit is running, but the air isn’t cold — or not cold enough.
Fix: This could be due to clogged filters, blocked vents, or low refrigerant levels. Start by cleaning or replacing your filters. If that doesn’t solve the problem, contact a licensed technician to inspect the refrigerant levels and system pressure.
Uneven Cooling
Problem: Some rooms are icy while others feel like a sauna.
Fix: Uneven cooling is often the result of poor airflow or thermostat placement. Make sure vents are open and unobstructed. You may also benefit from a zoned system or upgrading your thermostat to a smart one for better temperature control.
Strange Noises
Problem: Banging, clanking, hissing — your unit sounds like it’s ready to fall apart.
Fix: Different noises can indicate different issues. Rattling might mean loose parts, while hissing could signal a refrigerant leak. Turn off the system and call in a professional to inspect the source of the sound before more damage occurs.
Bad Smells
Problem: Musty, burnt, or sour odours coming from the vents.
Fix: A musty smell could be mould in the ducts or unit. A burnt smell might mean an electrical issue. Turn off the system and clean the filters. If the smell persists, book a service to clean the internal components and ductwork.
Water Leaks Around the Unit
Problem: Puddles forming around your indoor unit.
Fix: This usually points to a blocked or disconnected drain pipe. You can try to locate and clear the blockage, but if water continues to build up, it’s best to get a professional to prevent damage to your walls or flooring.
Frozen Coils
Problem: The indoor unit is covered in ice.
Fix: Frozen evaporator coils can be caused by restricted airflow or low refrigerant. Turn off the system to allow the ice to melt, clean the filters, and check for any blocked vents. If the problem keeps recurring, have a technician check for leaks or deeper issues.
Short Cycling
Problem: The system turns on and off too frequently.
Fix: This could be due to an oversized unit, thermostat problems, or restricted airflow. Check your filters and thermostat placement first. If it continues, you may need a system evaluation to ensure your unit is correctly sized and functioning efficiently.
Thermostat Issues
Problem: The temperature never seems quite right.
Fix: If your thermostat is outdated or in a poor location (like near windows or heat sources), it can’t measure the room temperature accurately. Consider upgrading to a programmable or smart thermostat and relocating it to a central spot in the home.
High Energy Bills
Problem: Your energy bill has skyrocketed, even with moderate use.
Fix: Dirty filters, leaks in the ductwork, or an ageing system can all drive up power usage. Regular servicing keeps your unit efficient. If your system is over 10–15 years old, it might be time to consider a modern, energy-efficient upgrade.
Keep Your Cool with the Pros
Preventative maintenance is key to avoiding most air conditioning problems. Scheduling regular servicing can keep your system in top shape and help you avoid costly repairs down the line. If you’re unsure how to handle an issue — or want expert advice — the team at Bay To Bay Air Conditioning offers reliable service, repairs, and installations across the region. Don’t sweat it — tackle these common problems early, and your air con will keep you comfortable no matter what the Aussie weather throws your way.
