Aircon Troubleshooting Guide for Singapore: Common Problems and How to Fix Them
This content has been updated for 2026 to reflect the latest information, recommendations and common aircon troubleshooting issues.
It is a scorching day, and you head to your room hoping to escape the heat. You switch on the air conditioner, but nothing happens. An air conditioner breaking down can sound like a nightmare, especially in Singapore’s heat. However, before you call a technician, some common aircon issues can be fixed with simple troubleshooting steps. In this article, we will talk about the most frequent minor aircon problems and how you too can solve them!
Common Aircon Issues and How to Fix Them
Your Air Conditioner Suddenly Stopped Working
One moment your aircon is running smoothly, and the next, it is completely unresponsive. Before you assume the worst, try checking these possible causes:
First and foremost, the power supply should be intact. A loose power cord or a tripped circuit breaker can cut off electricity to your unit. Try resetting the breaker or plug the unit in securely if needed. If the power source is not the problem, use the manual power button on the aircon itself. Sometimes, remote controls just need fresh batteries.
Another common issue is a clogged air filter. Filters tend to get too dirty after months, they restrict airflow and may cause the unit to overheat, which leads to an automatic shutdown. In these cases, cleaning or replacing the filters might just be all it takes to get your aircon running again.
Aircon Not Cold Enough
As mentioned earlier, not so fun in Singapore heat but it can happen to anyone, so it is best to know what to do next. Sometimes your air conditioner is on but the room still feels warm even after some time. Start by checking the thermostat settings. Make sure the temperature is set to ‘cool’ and is lower than the current room temperature. If that checks out, move on to the air filters. When they are clogged, they reduce airflow, which reduces the cooling effects.
Low refrigerant levels could also be the reason behind weak cooling. If you notice the air from your unit isn’t as cold as it should be, a refrigerant top-up may be necessary, but this requires professional servicing. As a last resort (if everything else checks out), take a look at the outdoor condenser unit. If it is blocked by dirt, debris, or leaves, it will not function properly. Clean the condenser unit and clear any obstructions to restore airflow.
Air Conditioner and Heater Not Working
If your aircon has both cooling and heating functions and neither is working, there could be an issue with the power supply or internal components.
Start by checking if the circuit breaker has tripped. Resetting it might restore functionality. If that does not help, the thermostat could be faulty and fail to send signals to switch between heating and cooling. Another possibility is a damaged compressor, if your unit is making strange noises or refuses to start, professional repair may be necessary.
Air Cond Is Leaking
This may not affect the performance of your air conditioner but if your unit suddenly starts leaking, do not ignore it, water damage, mould, and rust can follow. First, check if the drainage is clogged. If water is not flowing out properly, clear any blockages and dry the area before turning the AC back on.
Secondly, take a look at the coils and drain pan, if they are wet, wipe them down and see if rainwater is getting in. Also, thoroughly inspect the unit for any cracks or damage that could be causing leaks and seal them up quickly.
Essential Troubleshooting Tips
Stay on Top of Regular Upkeep
The best way to avoid problems is through routine upkeep. Clean your air filters every two weeks and book professional services every few months to keep your system running well.
Look for Blockages in Air Vents
Air vents with blockages can limit airflow, which affects how well your system cools and heats. Make sure vents are open for proper ventilation and not blocked by furniture, curtains, or other random items.
Do not Let Cool Air Escape
It may sound obvious, but open windows and doors are one of the easiest ways to overwork your aircon, and people sometimes overlook this. If warm air keeps coming in, your AC has to work twice as hard to keep the room cool, which means higher energy bills and more strain on the unit. For your room to become cold, make it a habit to close all windows and doors before switching on the aircon.
Watch for Ice Build-Up
Ice on the aircon coils points to poor airflow or issues with refrigerant. Switching off the unit and allowing the ice to melt before you start it again can sometimes help, but if the ice keeps forming, you may need to call a technician.
Pay Attention to Strange Sounds
Loud bangs, clicks, or buzzes often mean something inside the unit has come loose or broken. If you catch these issues early, you could prevent further damage and save on repairs.
Consider Resetting the Unit
If you are unsure what is causing the issue, there is a classic trick that often helps. Turn off the air conditioner, unplug it for a bit, and then start it up again. When you do this, it resets the minor issues or glitches that are preventing the unit from running.
When Should You Call a Professional
If any of these troubleshooting efforts do not fix the problem, or if you notice burning smells, frequent water leaks, or power trips, it is time to call an expert. A professional has the experience and expertise to diagnose the issue accurately and rectify it.
So, the next time your unit stops cooling or refuses to turn on, try these steps before reaching for the phone to book a repair. And if nothing seems to do the trick, do not hesitate to reach out, we are here to help with professional repairs.