It can be frustrating when your aircon starts cold, then suddenly stops cooling after a few minutes. In Singapore’s hot and humid weather, this problem quickly becomes uncomfortable. However, this issue is more common than you think, and in many cases, it can be fixed with the right approach.
Let’s look at the most common reasons why your aircon cools at first but then stops — and what you can do about it.
1. Dirty Air Filters Restrict Airflow
First of all, clogged air filters are one of the most common causes. When dust and dirt block the filters, airflow becomes weak. As a result, your aircon may cool briefly, then shut off or blow warm air to protect itself.
Easy fix:
Clean your air filters every 2–3 weeks. If they are old or damaged, replace them. Regular aircon servicing Singapore helps prevent this issue.
2. Frozen Evaporator Coils
Next, if airflow is restricted or refrigerant levels are low, the evaporator coils can freeze. When this happens, cooling stops completely until the ice melts.
Signs to watch for:
Weak airflow
Water leaking after the aircon turns off
Cooling returns after the unit rests
Easy fix:
Turn off the aircon and let it thaw. Then, book aircon repair Singapore to check airflow and gas levels.
3. Low Refrigerant (Aircon Gas)
Another common reason is low refrigerant gas. Your aircon may start cooling, but once the gas pressure drops, cooling stops.
This often happens when:
There is a refrigerant leak
The aircon hasn’t been serviced for a long time
Easy fix:
A professional aircon gas top-up Singapore and leak check will restore proper cooling.
4. Overheating Outdoor Unit
Meanwhile, the outdoor condenser unit may overheat, especially if it is exposed to direct sunlight or blocked by debris. When this happens, the system temporarily shuts down to prevent damage.
Easy fix:
Clear debris around the outdoor unit and ensure proper ventilation. Also, schedule regular aircon maintenance Singapore to keep coils clean.
5. Faulty Thermostat or Sensor
Sometimes, the issue isn’t cooling-related at all. A faulty thermostat or sensor may incorrectly detect room temperature and tell the aircon to stop cooling too early.
Easy fix:
Have a technician inspect and recalibrate or replace the sensor if needed.
6. Electrical or Compressor Issues
Finally, electrical problems or a weak compressor can cause the aircon to stop cooling after running for a short time. This is more common in older units.
Warning signs include:
Circuit breaker trips
Loud buzzing noises
Aircon shuts off repeatedly
Easy fix:
Stop using the unit and contact a licensed aircon technician Singapore immediately.
When Should You Call a Professional?
If your aircon:
Stops cooling repeatedly
Leaks water
Makes unusual noises
Has rising electricity bills
Then it’s time for professional aircon servicing in Singapore. Ignoring these signs can lead to bigger and more expensive repairs.
How Lion City Air Conditioner Services Can Help
At Lion City Air Conditioner Services, we provide complete solutions, including:
Aircon servicing Singapore
Aircon repair and troubleshooting
Chemical wash and chemical overhaul
Gas top-up and leak repair
Our experienced technicians help your aircon cool consistently and efficiently.
📞 Call or WhatsApp: +65 8818 5781
🌐 Book online: https://lioncityaircon.sg
