It’s a hot, humid day in Singapore, and you’re ready to cool down — but your aircon is not turning on. Before you start to worry, know that this is a common issue many homeowners face. In fact, there are several reasons why your aircon might not be turning on, and some of them are simple fixes you can try on your own.
In this article, we’ll explain the possible reasons behind an aircon not turning on, what you should check first, and when it’s time to call a professional technician if your unit still isn’t turning on.
Common Reasons Why Your Aircon Won’t Turn On
First of all, when your aircon refuses to start, it usually means there’s a problem somewhere in the system.
Sometimes it’s a minor issue, while other times, it may need professional attention.
Let’s go through the most common causes one by one:
Power Supply Issue
Firstly, check if your aircon is properly plugged in and that the wall switch is turned on.
In addition, head over to your home’s circuit breaker.
If it has tripped, simply reset it and try turning your aircon on again.
This is one of the quickest things you can check yourself.
Remote Control Problem
Next, take a look at your remote control.
Sometimes, weak or dead batteries, or incorrect settings can stop your aircon from working.
Therefore, replace the batteries and double-check your mode and temperature settings.
Dirty Air Filters
Another possible reason is dirty or clogged air filters.
When filters get blocked, airflow is reduced, and the aircon may overheat and shut down as a safety precaution.
As a result, the unit might not turn on at all.
That’s why it’s a good habit to clean your filters every 3 to 4 weeks.
Faulty Capacitor or PCB
In addition, if your aircon still won’t start, it might be due to a faulty capacitor or a damaged Printed Circuit Board (PCB).
When these parts fail, the system won’t respond even if there’s power.
At this point, it’s best to call a trusted aircon technician for help.
Low Refrigerant or Gas Leak
Lastly, if your aircon has been cooling poorly before completely shutting down, it might have a refrigerant leak or low gas level.
In this case, the system might detect an issue and automatically prevent the aircon from turning on to avoid damage.
What Should You Do Now?

So, what’s the next step?
Here are a few simple things you can try before calling for service:
✔️ Check the power plug and wall switch
✔️ Inspect and reset your circuit breaker
✔️ Replace your remote control batteries
✔️ Clean your air filters
✔️ Turn your aircon off for a few minutes, then restart it
However, if none of these steps work, it’s time to call in the professionals.
Get Fast, Reliable Help from Lion City Air Conditioner Services PTE LTD!
In conclusion, an aircon that won’t turn on could be caused by anything from a simple battery issue to a more serious internal problem.
The good news is, you don’t have to deal with it alone.
At Lion City Air Conditioner Services PTE LTD, we provide fast, affordable, and reliable aircon repair services anywhere in Singapore.
Our skilled team can quickly diagnose the problem and get your aircon running smoothly again.
📞 Call us today at +65 8818 5781
🌐 Book your appointment online at lioncityaircon.sg