7 Common Air Conditioner Problems & How to Fix Them

As we inch closer and closer to summer, we'll rely more and more on our air conditioners to keep our homes cool and cosy. But like any appliance, air conditioning units can break down over time and often without warning. Knowing common air conditioner problems can help you keep your system running smoothly and avoid breakdowns.
From an uncommon but entirely possible AC refrigerant leak to the more commonplace issue of dirty air filters, many things can go wrong with your air conditioning unit. From split systems to ducted air conditioners, some issues are easy to fix while others need professional help.
By identifying and addressing these common air conditioning problems ASAP, you can save time and money and have your system working when you need it most.
1. Your Air Conditioning Unit Stops Blowing Cold Air
These days, most air conditioning systems come with reverse cycle functionality, which means they can blow cold air in summer and hot air in winter. But when your AC system starts blowing only warm air, it becomes the last thing you need as summer approaches and the air temperature spikes.
When it comes to air conditioning problems, this is a common one and is often the result of one of three things:
- Incorrect thermostat settings
- A clogged air filter
- Low refrigerant levels
The first step is to check your thermostat to make sure it’s set to “cool” and not “fan only” or “heat.” Next, check the air filter. Dirty or clogged air filters can restrict airflow, making it harder for your air conditioner to work properly. If these quick fixes don’t work, you might have a refrigerant gas leak; this requires a professional for a safe and compliant fix.
2. Your AC Unit Cycles On and Off
Short cycling is a condition that sees air conditioners turning on and off frequently. It’s a problem that can cause uneven cooling and increased energy consumption. Often behind the problem is the thermostat sensor malfunctioning or being placed too close to a heat source.
A dirty air filter can also cause cycling issues by restricting airflow, causing the air conditioner to overheat and shut down. Low refrigerant levels can also strain the system. Fixing these issues early can help your air conditioner work properly, become more efficient and prevent long-term damage.
3. The Air Conditioning System Has Sprung a Water Leak
Water leaking from your air conditioner can be a nuisance and might be a sign of a bigger issue. These leaks happen when the condensate drain becomes clogged and water can’t drain properly.
Over time dust and debris can accumulate and block the drain. A frozen evaporator coil can also cause water leaks as the ice melts and overflows the drain pan. To fix this, make sure the drain line is clear and the evaporator coil is ice-free. If the problem persists, call a licensed technician to service your system and prevent further damage to your air conditioner.
4. Dirty Filters Affecting Indoor Air
A dirty air filter can affect the performance of your air conditioning system as well as the indoor air quality of your home.
When air filters become clogged with dust, dirt and other particles, they restrict airflow. This makes it significantly harder for them to circulate cool air. Not only does it make your system work harder – and consume more energy doing so – but it also allows allergens and contaminants to circulate in your home.
To avoid this, replace air filters every 1-3 months and schedule regular maintenance. Clean air filters will make your air conditioner work properly, keep your home comfortable and your indoor air fresh and healthy.
5. Low Refrigerant Levels and Leaks
Refrigerant leaks and low refrigerant levels can be a big problem for your air conditioning system.
AC units can’t produce cool air when refrigerant levels drop. It results in warmer temperatures and higher energy consumption. Common signs of a refrigerant leak are:
- hissing noises
- ice forming on the refrigerant lines and
- the AC unit blowing warm air
It’s worth noting that refrigerant leak issues are not common. They tend to occur as a result of improper installation, corroded or dirty coils, general wear and tear, and loose connections. Unlike other problems, fixing a refrigerant leak requires a licensed technician. They’re the only ones who can handle the refrigerant and recharge the system.
6. A Faulty Thermostat or Control Panel
A faulty thermostat or control panel can cause a raft of dilemmas with your air conditioning system. You might experience uneven temperatures, or find the system won’t turn on at all. Sometimes the thermostat may not read the room temperature correctly, making your air conditioner run too long or not long enough.
Check the thermostat settings are correct and aren’t exposed to direct sunlight, as this can affect its readings. You may also have a tripped circuit breaker getting in the way; if that’s the case, just reset it. Should the problem persist, the issue might be with the control panel or electrical components. A professional can diagnose and repair these issues so your air conditioner will work properly.
7. Dirty or Frozen Evaporator Coil
A dirty or frozen evaporator coil can greatly affect your air conditioning system’s performance. When the coil is dirty or grimy, it can’t absorb heat and your air conditioner can’t cool your home. A frozen evaporator coil is often a sign of poor airflow, maybe due to dirty air filters or blocked vents.
To fix this, start by cleaning the air filters, and make sure you have proper airflow throughout the system. If ice has formed, turn off the unit and let it thaw. For stubborn cases, it’s best to call a licensed technician to clean the air conditioning coils and restore your cooling.
When to Call a Licensed Air Con Technician
While you can certainly address some air conditioning issues yourself, there are times when you’ll need a licensed air con technician.
If you’re dealing with complex problems like refrigerant leaks, faulty electrical controls or the blower fan not working, it’s time to call a pro.
They’ll handle the refrigerant gases, repair electrical components and make sure your air conditioner runs efficiently. A licensed technician can also inspect and maintain the system to prevent future problems.
Trust an expert and your air conditioner will remain in top shape for longer.
Keep Your Air Con Running Smoothly
Fixing common air conditioner problems early will save you time, money and hassle.
Whether it’s a simple fix like replacing dirty air filters, or a complex issue like a refrigerant leak or electric control failure, addressing these problems early will keep your air conditioner running efficiently.
Don’t forget regular maintenance is the key to avoiding breakdowns, and that a licensed air con technician is your best buddy for complex repairs.
With proper care, your air conditioner will keep your home cool and comfortable during the hot season and give you a peaceful and relaxing environment.
Please note: Thanks for reading our blog “7 Common Air Conditioner Problems & How to Fix Them”. This information is provided for advice purposes only. Regulations differ from state to state, so please consult your local authorities or an industry professional before proceeding with any work. See After Hours Air Conditioning’s Terms & Conditions here.